EDU_CAT_EN_IMA_FF_V5R18_toprint.pdf

8/17/2019 EDU_CAT_EN_IMA_FF_V5R18_toprint.pdf

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Imagine and Shape

Copyright DASSAULT SYSTEMES 1

C o p y r i g h t D A S S A U L T S Y S T E M E S

Imagine and Shape

CATIA V5 TrainingFoils

Version 5 Release 18September 2007

EDU_CAT_EN_IMA_FF_V5R18


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About this course

Objectives of the courseUpon completion of this course you will be able to:

- Identify and use the tools specific to the Imagine and Shape

workbench- Create new product shapes

- Improve product styles

- Modify the product style surfaces using Shape Design tools

Targeted audienceProduct Stylists, Industrial Designers

PrerequisitesStudents attending this course should be familiar with the CATIAGenerative Shape Design

1 day


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Table of Contents (1/2)

Introduction to CATIA Imagine and Shape 5

Overview of Imagine and Shape Workbench 6

Accessing the Workbench 11

Imagine and Shape: User Interface 12

Imagine and Shape: Recommended Settings 18

Imagine and Shape Common Tools 21

Curve Modeling 31

Curve Creation 32

Curve Deformation 35

Surface Modeling 46

Creating Basic Surfaces 47

Manipulating Surfaces 51

Modifying the Topology 64

Operations 80

Editing Multiple Surfaces 81

Dimensioning a Surface 85

Associating Elements 90Other Operations 97


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Introduction to CATIA Imagine and ShapeIn this lesson you will be introduced to the working environment of Imagine andShape Workbench.

Overview of Imagine and Shape WorkbenchAccessing the Workbench

Imagine and Shape: User Interface

Imagine and Shape: Recommended Settings

Imagine and Shape Common Tools


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Overview of Imagine and ShapeYou will get an overview of CATIA Imagine and Shape workbench.


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Overview

CATIA Imagine and Shape is used in the product conception stage. The basic principlebehind this workbench is to start with a simple closed or planar shape, then to reach

the idea you have in mind by manipulating and refining the mesh of this shape byrotation, translation, scaling or subdivision. You can also use GS1/GSD operators to

combine the surfaces and finalize the shape.Surfaces created in Imagine and shape workbench are based on “Subdivision Surface”

theory.


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Introduction to Subdivision Surfaces

Catmull-Clark subdivision surface

Doo-Sabin subdivision surface

Origin of subdivision surfaces goes back to 1978 when Catmull and Clark, and Dooand Sabin first proposed to generalize bi-cubic and bi-quadratic patch methods to

meshes of arbitrary topology.


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What is a Subdivision Surface

Subdivision algorithms are exceptionally simple, work for arbitrary control meshes and

produce globally smooth surfaces. Special choices of subdivision rules allow for theintroduction of features into a surface in a simple way.

Subdivision-based representations of complex geometry can be manipulated andrendered very efficiently, which makes subdivision a highly suitable tool for interactive

animation and modeling systems.

Subdivision is an algorithmic technique to generate a smooth surface as a sequenceof successively refined polyhedral meshes.


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Accessing the Workbench

Click "Start > Shape > Imagine & Shape"


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Imagine and Shape: User Interface (1/6)

Imagine andShape Tools

Subdivision Surfaces

Modification Tools Palette

Compass

Geometry created inIMA appears underGeometrical Set inSpecification Tree

Contextual Display

ShapeOperation


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Contextual helpText information to inform you about thecurrent function and which is linked to the

mouse cursor can be displayed at all times.The contextual display can be turned on andoff using this icon.

Three levels are available:

First level: no display Second level: Manipulation/Translation

Third level: display all information

Toolbars

All functions have associated and dedicatedtoolbars to access options.No dialog panels are then displayed, savingscreen space.

Option keysThe shift and control keys are frequently usedto manage selection and actions.

The contextual help gives you a clear messageabout the active keys and their actions.

Control from a DistanceThe mouse cursor need not be placed on anelement (or even very close to it) to change itsshape.This feature gives you a real productivity gainby enabling faster interaction with elementsand handles.


General behavior:

Here, the shape of the curve is being modifiedby dragging the mouse cursor. The cursor neednot be close to the curve to achieve this.


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NameToolbar

Sketch Curve

Open surfacecreation

Closed surfacecreation

Face Cutting

Face Subdivision

Erasing

Modification ofcurve/ surface

Icon

Creation

StylingSurfaces Extrusion

Number of Sections

Modification

IMA workbenchWorkbench

SelectionSelect/ SelectionTrap

Help Text Text Help Level

Dimension

Multi Selection


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NameToolbar

Working ZoneDefinition

Extract

Trim

Split

Icon

LinkOperations

Symmetry

ShapeOperations

Boundary

Join

Shape Fillet

Edge fillet

Variable Fillet

Offset

View and Selectionmode


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NameToolbar

Intersection

Multiple Extract

Icon

Revolve

Extrude

ShapeOperations(Continued)

Blend

Update All

Manual Updatemode

View ModificationF2

View Selection F4

Update

ViewManagement

Note: All commands in IMAare available by shortcuts.


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Imagine and Shape: User Interface (6/6)NameToolbar

Compass Definition

Rotation

Affinity

Attraction

Icon

Translation

Reset Compass

Tools Palette(ForModification)

Local normals

Pick

Data Definition

Attenuation

All Type Selection

Select All

Edge Selection

Face Selection

Vertex Selection

Alignment


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Imagine and Shape: Recommended Settings (1/3)

Update propagation: This option allows you to define the level of children to be updated whenworking in Manual update mode.

Attenuation: This option lets you define the ratio between the mouse displacement and the actualdisplacement of the manipulator. This option is important to improve the accuracy of mesh control.

Automatic Weight on vertex: Weight is automatically applied on vertex when there is at least threeconnected edges. This option is checked by default.

1

2

3

Without Automatic

Weight option

With Automatic Weight option

Primitive creation center mode: This option lets you specify the center of gravity of a primitive as the center ofthe screen or at the origin of a part.

4

1

2

3

4


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These options let you define the

graphic properties for curves.

This option lets you definethe color of surfaces.

These options let you define thegraphic properties for base meshes.


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To get a nice look of the environment, set the following:

Set the Thickness of type 2 lines to “1” (instead of “2”)

Under ‘Visualization’ tab set the ‘Anti-aliasing’ ON.

Enable 'Proportional' option and set to "0.1" to maximize dynamic display performance.


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Imagine and Shape Common ToolsYou will learn about the tools which can be accessed on the fly while creatingand manipulating surfaces.


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Selection Tools (1/3)

In most functions the modification Tools Palette contains a set of icons dedicated tomesh selection.

Using one of the selection icons enables a filter mode to only select specifiedmesh elements.

NameToolbar

All Type Selection

Select All

Icon

Edge Selection

Face Selection

Tools Palette(ForModification)

Vertex Selection


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Use the shift key to perform a trap selection.Press the shift key

Draw the trap

Release the shift key

Use the control key to add or remove the selection.

An unselected element is added to the selection

A selected element is removed to the selection

Use the combination of shift and control key to add orremove a trap selection.

Use a single click to select the element (moving themouse as close as necessary to highlight the element).



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Use Propagation icon topropagate edges selection.

When you select an edge, you can propagate the selected edge.

With propagation option a set ofconnected edges is selectedWithout propagation optiononly one edge is selected.

The manipulator allows you toselect two different sets ofconnected edges. Same edge selected but with

different mouse pointer position.


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Axes Permutation

For several functions, the contextual toolbarcontains a set of icons dedicated to compassmanagement.

Use the dedicated icon to modify the origin and theorientation of the compass.

The toolbar contains a set of dedicated options:

Compass Definition (1/5)

NameToolbar

Compass Definition

Rotation

Icon

Reset compass

Tools Palette

(For Compassdefinition)

Translation

Pick 3D element


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The compass is defined depending on the selected element:

Generally, the compass plane (x and y axis) is defined using a meanplane computation of the selected elements.

Selecting a face

Align the compass X-Y plane on the mean plane of the face.Selecting an edge

Align the Z axis of the compass along the edge direction.

Selecting a point

Define the compass origin.

Any combination is possible.


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Defining the compass using vertices:

The compass origin The Z axis The X and Y axis (the previous Zaxis is replaced by X axis)

The compass origin is locked using a single click on a vertex and is not modified if you

add elements to the selection. To free its position, use the second icon on the toolbar.By selecting three vertices successively you define:

The compass origin

The Z axis

The X and Y axis


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Selecting an edge defines the Z axis.

Defining the compass using edges:

You can also select a set of elements using multi selection (controlkey or trap using shift key).

Selecting successively two edges defines:

The Z axis

The X and Y axis (the previous Z axis isreplaced by X axis)


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Use the third icon to switch the compass axis.

X change to Y, Y to Z and Z to X

To freely define the compass, use one of the following icons to perform

translation and rotation.

Use the icon to exit the compass definition.


Use the Pick icon to pick 3D element in 3D

area. Compass aligns to this element.


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View Selection (It allows to quickly change the view orientation)

Press F4 key on the keyboard.

Move the mouse pointer around your model.

A green pyramid appears.

Select the required view.

View Modification (Shortcut =F2)

Press F2 key on the keyboard.

Select Parallel or Perspective view.

For Perspective view option you can define interactively the focal angle (Default 15°).

Managing the Views

Use F4 key + Shift-trap + Ctrl for better productivity in edge/vertex/plane selection.


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Curve ModelingYou will learn how to create and deform surfaces. Also, you will learn how tolink a curve to a surface.

Curve CreationCurve Deformation


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Curve CreationYou will learn how to create curves in Imagine and Shape workbench.


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About the Curve Creation Modeler

A powerful curve modeler based on an aesthetic approach supports thesubdivision surfaces technology

This new modeler provides users with a natural and intuitive way of drawing

and controlling complex curve

These curves can be created, a posteriori, in the model

The subdivision surfaces can be then controlled by curves for globaldeformation

The connections between curves are G3.


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How to Create a Curve

Curve sketching

Created Curve

Use the dedicated Sketch Curve icon to create a newcurve.

A tools palette is displayed. If you want to create a curvelying on a plane use “Plane Selection” icon and select the

plane.

If you don’t specify a plane, the curve will be created onthe view plane.

To create a curve, use the mouse to sketch or use a penpalette if possible (better feeling).

Click and, keeping the left mouse button pressed,describe your sketch, and then release the mouse button.During the mouse manipulation a temporary curve will bedisplayed.

As soon as you release the mouse button, the curve iscreated; the temporary curve will be smoothed to display

the final curve.

The tools palette will then contain additional options (seeCurve Manipulation section)

You can then continue to sketch to refine the curve


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Curve DeformationYou will learn how to deform existing curves.


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Toolbar description:

About Curve Deformation

Name

Fillet definition

Erase

Planar constraint

Transformations

Icon

Area Selection

Characteristics

Curve sketching

Direct deformation

Smoothing

The interaction is based on natural drawing and direct manipulation


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The Curve sketching option allows you to draw and refine a curve in a same way asdrawing with a pen and paper.

Use a pen tablet to better control the drawing.

You can iterate by drawing as many sketches as you wish, the curve will be

recomputed and updated each time.

Redefining a Curve by Sketching


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Manipulating the Points

The Manipulate a point option allows you to manipulate the curve.

Select the curve to modify.

Press, and keep pressed, the left mouse button.

Move the mouse to reach the desired curve.

Release the mouse button.

If the “curve plane” option is activated the manipulation is allowed only in theplane where the curve has been created.

If the “curve plane” option is not activated the manipulation is allowed in all

directions.


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Select the curve to smooth

Click anywhere to smooth the curve

The more you click the more the curve is smoothed

To smooth only a portion of the curve, press the Ctrl key and select the portionto be smoothed.

Smooth the portion as explained above

Smoothing a Curve

Portion to be smoothed

The Smoothing option allows you to smooth a curve


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Manipulator

Filleting a Curve (1/2)

The Fillet option allows you to smooth and better control the shape in a local area.

Portion to be smooth

Select the curve

Select the Fillet option

Press, and keep pressed, the left mouse

button

Move the mouse along the curve to select

the area where you want to apply theFillet

Release the mouse button

Drag the manipulator along the greencurve to define the Fillet


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Filleting a Curve (2/2)

Portion to be smooth Manipulator

Control Point

If the modification area includes an extremity of the curve, the handle allows themanipulation of the position of this limit and the orientation of the tangent


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Erasing a Curve

The Erase option allows you to erase a portion of the curve

Select the curve

Select the Erase option

Press, and keep pressed, the left mousebutton

Move the mouse along the curve to

select the area to erase


Special case:

Erasing an inner portion of the curve removes

the details and create a “nice” shape

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Removing the extremity of a curve

Removing the internal part of a curve

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Defining Curve Characteristics

The Curve Characteristics option allows you todisplay and modify curve characteristics.

Select the curve

Select the Curve Characteristics icon

Change the value of Order field. (The greeter the order,

the tighter the curve)

Check Arc Number and change the value to modify the

maximum number of arcs

Check View Limits to display the limit arcs in 3D area

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Curve Transformations

The Curve Transformation option allows you to accesstransformation icons while modifying a curve.

See CompassDefinition session

See ManipulatingSurface session

Select the curveSelect the Transformation icon

The tools Palette containing the transformation icon is

displayed

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Deforming a Curve in 3D Space

To deform the curve in 3D space deactivate the option Curve Planarity.

Curve Planarity option is ON by default .

Unselect the option to work in 3D space.


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Creating Basic SurfacesYou will be introduced to the basic surfaces and learn how to create andmanipulate them using Imagine and Shape tools.

Imagine and Shape


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About Basic Surfaces

Creating open surfaces

Creating a Circular Surface

Creating a Triangular Surface

Creating a Ring-Shaped Surface

You have also the possibility to create those kind of shapes:

Creating Closed surfaces

Creating a Cylinder

Creating a Box

Creating a Pyramid

Creating a Taurus

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Use one of the two dedicated icons to create a first surface.

Open surfacesClosed surfaces

Surfaces are created using the current viewpoint information:It can be at the center of the screen or at the origin of thepart, depending on the CATIA settings.

View Centered: Creates surface at the center of screen Origin Centered: Creates surface at the origin of the

part

The size is a ratio of the window size (independent of the

zoom factor) The size of the mesh is equal to ¼ of the screen size

Note: to manage accurately the size of the surface referto “Scaling” section

The model axis orientation is used to define the surfaces.

The mesh is aligned along the model axis.Open surfaces are created on the plane which is the most

parallel to the screen.

How to Create Surfaces (1/2)

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The modification function is automatically launched after thecreation and the entire mesh is selected (allows to quickly

position or scale the element).

How to Create Surfaces (2/2)

The Number of Sections icon can be used to add sections tomake open and closed primitives closer to the real shape.

You can apply this effect on Sphere, Cylinder, Torus andCircle.This option is OFF by default

Click the option to enable it

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Manipulating SurfacesYou will learn how to deform surfaces with the surface manipulation functions.

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The compass is used to highlight handles that show theallowed manipulations. The cursor does not need to be onthe handle to manipulate it.

The handle origin is by default positioned at the middle pointof the selected elements. To specify another location use theCompass Definition option if needed.

During the manipulation, the surface is roughly pre-visualized.

The impacted area is displayed in orange color.

The surface is exactly computed at mouse release.

About the Surface Manipulation

Manipulation functions enable you to control the mesh that drives the surface.

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To perform the translation:

Move the mouse to highlight the desired axisor plane (no need to be on the element)

Click and keep the left mouse button pressed

Move the mouse to translate the elementsRelease the mouse button

To move selected elements, select the Translation icon. The icon is displayed as shown.

Applying Translation (1/3)

You can perform translations along 3 directions or onto 3 planes (defined by thedirections), depending on the mouse cursor position

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You can translate the selected elements by desired value using Data Definition icon.

Three options are available for translation using Data Definition.


Selected elements for Translation

Translated Compass

Compass gets translated and selectedelement are aligned on compass plane

Compass at the Origin

Compass and selected elements get translated.

Aligned Coordinates

Compass and selected elements gettranslated to the origin of the surface.

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To have a better control during the translation,use the Attenuation command

Option on

Option off


You can translate the selected elements with thehelp of 3D elements using the Pick icon.

Select the Pick icon.Select a 3D element

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To perform the translation:

Select the elements - vertices, edges orfaces.

Move the mouse to drag selected elements

along their own local normals.Release the mouse button

To have better control during translation use theAttenuation command

Option on

Option off

To translate normal to the selection, select the Local Normals icon. The icon is displayed asshown.

Applying Translation along Normals

You can perform translations along the normal to the selection as if performing alocal offset.

Translation along Normal

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To perform the rotation:Move the mouse to highlight the desired rotation axisClick and keep the left mouse button pressedMove the mouse to rotate the elements


A graphical display informs you of the angle value

During manipulation, use the control key to enable a 5°step.

If needed, use the Compass Definition option to specify theorigin of the rotation and the orientation of axis (see thecorresponding section).

To have better control during translation, use the Attenuationcommand

Option on

Option off

To rotate the selected elements, select the Rotation icon.The icon is displayed as shown

Applying Rotation

You can perform rotations around one of the three axes of the handle.

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To scale selected elements, select the Affinity icon. The icon is displayed as shown.

Scaling

You can perform scaling along a single axis, along two axes or a full 3D scaling.

To stretch in a single direction:Move the mouse to highlight the desired axis or plane

Click and keep pressed the left mouse buttonMove the mouse to scale the elements


Use the control key to perform a 3D scaling (along the threedirections):Press the control keyClick and keep pressed the left mouse buttonMove the mouse to scale the elements


If needed, use the Compass Definition option to specify theorigin of the scaling and the orientation of axis.

To have a better control during the translation, useAttenuation command

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Aligning (1/2)

Define the compass origin and orientation

Select the type of alignmentOn Plane: Projects vertices onto thecompass planeOn Axis: Projects vertices onto thecompass axis

Pick: Projects vertices onto selected edge,or plane

Select the elements to be aligned, which can bevertices, edges or faces.Click on the manipulator arrow depending onthe direction where you want to align theelements.

You can align selected elements on a chosen support. Support can

either be a plane or an axis.

To perform the alignment:

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Aligning (2/2)

Projection on compass planeProjection on compass axis Projection on 3D element selection

Selected edge for alignment

Alignment of selected elements on an axis, plane or 3D element can

be managed using three options.

On Plane: Used for aligning the elements withcompass plane.On Axis: Used for aligning the elements withcompass axis.Pick: Used for aligning the elements with 3Delement.

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Applying Weights (1/2)

Vertex weight modification

Edge weight modification

Use the Attraction icon to modify weights

Use the selection filters to enable edges or vertex selectionand then modify their attributes.

The value of the weight is displayed on the bar. (valuebetween 0 and 100%).

To modify a weight value:

Select the elements to modify.In the ‘Manipulation / Weight’ manipulator select thedesired percentage.

If weight is applied to an edge or a vertex, its look isdifferent than others (the edge is thicker, the line is notdotted, the vertex is a bigger circle).

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Applying Weights (2/2)

The value of the weight is indicated with a

“minus” sign for sharp edge.

Smooth connection

Sharp connection

When you select a surface or an edge two options are available:

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Defining Precise Parameters for Manipulation

When you manipulate vertices, edges or faces, you can precisely define parametersusing the Data Definition icon. This displays a contextual panel which enables the

specification of precise values.

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Modifying the TopologyYou will learn how to modify the topology of the subdivision surfaces.

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Use one of the four dedicated icons to modify the structure of thesurface.

For these edition commands, the result with current selections isfirst previewed, then executed by clicking the Apply button.

What is Topology Modification?

Modification is previewed Modification is applied

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The extrusion function creates faces depending on the selected element.The Tools Pallet helps you to specify the selection filter (face or edge)

Extruding a Face (1/7)

Preview Creation

A face selection creates an extrusion made of 5 faces, the extrusion

direction is normal the selected face

An edge selection operates only on the border of open surfaces, it creates a singleface on a plane defined by the mean plane of the face connected to the edge.

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Use the control key to add a selection

Use a trap (with shift key) to create extrusions of a set of elements

You can use multi-selections to create a set of extrusions, join faces or fill holes.

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With Ctrl command Without Ctrl command

Use the control key to create a junction between 2 unconnected faces.

Select 2 unconnected faces or edges to create a junction

St d t N t

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Use the control key to fill holes

Select 4 connected faces or edges to fill a hole (using a trap or multi-

selection)

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E S

Use the Ctrl key to create combinations


Select 3 connected faces or edges to fill thespace between those faces

Select 2 connected faces or edges tocombine an extrusion

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Use the control key to create holes

Select two faces to create a hole. This works if the faces are not

directly connected and if the tangencies of the faces are aboutthe same. See next slide for details.

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Cases of hole creation

If the angle between the normal of the two selected faces is less

or equal to 90 degrees, the operation will result on a join of thetwo faces.

Case with result

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E tr ding an Edge (1/4)


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Edge extrusion

Options:

Fill

Extruding an Edge (1/4)

Examples

Fill option with propagation

Extrusion

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Extruding an edge of a flat surface using the Fill option.

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E S


Extruding an edge of a flat surface using the Fill option.

Generated faces are created

without weight on joined edges

If a sharp edge is present

on the boundary to be

filled then the edgebetween the originalshape and the new faceswill be sharp.

It is possible to fill several zones in a

single operation, using multi selection(CTRL Key or SHIFT key) to select alledges defining different zones.

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Fill Extrusion

Extruding an edge of a surface using the Fill option.

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Inserting Sections


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Inserting Sections

Cutting will propagate to the connected faces.

The Section Insertion function adds number of sections to the mesh whichwill cut faces in number of parts. Number of cuts can vary from 1 to 9.

The slider on the right of the screen is used to define number of cuts.

Selected Edge Slider

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Subdividing Faces


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Subdividing Faces

Use the control key or a trap using ShiftKey to add elements and subdivide the

selection.

The Subdivision function creates a set of faces inside the selected faces.The slider on the right of the screen is used to define the ratio between

0.1 to 0.9.

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Deleting Faces


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Deleting Faces

Use the control key or a trap using Shift Key to

add elements and subdivide the selection.

Use this function to erase faces or edges. A closed surface will bechanged to an open surface.

Face erase

Edge erase

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E S

OperationsIn this lesson you will go through the following operations on subdivisionsurfaces.

Editing Multiple Surfaces

Dimensioning a Surface

Associating Elements

Other Operations

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Editing Multiple SurfacesYou will learn how to select multiple surfaces and perform the samemodification on them, and use one surface to modify another.

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What is Multi-Surface Edition


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This function allows you to:

Perform the same action on several subdivision surfaces

Modify one subdivision surface using another

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How to Edit Multiple Surfaces (1/2)


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To multi select:

You must be in the modification command.

You need at least two surfaces.

To perform same action on severalsubdivision surfaces:

Select the Modification icon

Select the surface

Select the Multi Selection icon

Press the Ctrl key and select other surface(s)

You can change (Add, Remove) the set ofselected surfaces using Ctrl key

Select the Multi Selection icon and you are

back to Modification command

Select edges, faces or vertices of the surfacesand apply transformation (translation,rotation, affinity, alignment, attraction)

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How to Edit Multiple Surfaces (2/2)


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To modify one subdivision surface using other

When working on the first surface you candefine the compass with a second surface, and

perform operations such as a rotation or analignment on the first surface.

Select the Modification icon

Select the first surface

Select the Multi Selection icon

Press the Ctrl key and select the other surface

Select the Multi Selection icon to return to theModification command

Define the compass on the vertex of second

surface

Select edges, faces or vertices of the firstsurface and apply the transformation (rotation,

affinity)

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Dimensioning SurfacesYou will learn how to control the dimensions of a subdivision surface.

Student Notes:

Imagine and Shape

What is Surface Dimensioning?


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C o p y r i g h t D A S S A U L T S Y S T E

M E S

The main constraint of a stylist is the size of the product bounding box.This function allows you to:

Specify the exact dimension of the subdivision surface

A toolbar contains a set of dedicated options

DescriptionToolbar

Transform vertices along the directionof selected dimension

Icon

Transform vertices along the twodisplayed directions

Tools Palette(ForDimension)

Transform vertices along the three

displayed directions

Type ofModification

Name

OrthogonalView Change

CompassDefinition

Automatically changes the viewpoint to the closest view plane

Modifies the origin and orientation ofthe compass to define new axis system

Student Notes:

Imagine and Shape

How to Control Surface Dimensions (1/3)


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M E S

The function operates either in object-action oraction-object mode

You can select elements before using thefunction

You can use the function and select elements

Select the function iconSelect the surface

The view point automatically changes to theclosest view plane

Transform the surface in one direction using thisicon

Edit the dimension to changeThe transformation is applied in the directionof the selected dimension.

If the Type of modification is set as shown, and thedimension is edited the transformation will beapplied in two directions.

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M E S

Transform the surface in three directions usingthis icon

Edit the dimension to change

Transformation is applied along the threedisplayed directions

You can change the view point to the closest viewplane using this icon

Rotate the surfaceSelect this icon to change the view point.

Student Notes:

Imagine and Shape



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M E S

You can modify the origin and orientation of thecompass using this icon

Select this icon for changing the compassdefinition

The compass position can be modified using

the compass definition options available in thetools palette

Select the Compass Definition icon to go backto the Dimension command.

Student Notes:

Imagine and Shape

A i ti g El t


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M E S

Associating ElementsYou will learn how to link an existing subdivision surface to a point, line, curveor another surface.

Student Notes:

Imagine and Shape

What Is Associating elements?


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M E S

This function allows you to associate a point, line, curve or surface to the mesh andthen deform the surface by deforming the associated element.

Any kind of curve/surface can be used:

IMA Curve/Surface

FreeStyle Curve/Surface

GSD Curve/Surface

Sketcher Curve

A toolbar contains a set of dedicated options

NameToolbar

Curve Selection

Icon

Association Removal

Tools Palette(ForAlignment)

See SelectionTools section

All Association Removal

Student Notes:

Imagine and Shape

How to Create Associativity


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M E S

You need to have an additional point, line, curve orsurface in addition to the IMA surface.The function operates either in object-action oraction-object

You can select elements before using thefunction

You can use the function and select elementsSelect the function icon

Select the surfaceSelect the curve

Select the elements to associate to the curve, ablue line linking the selected vertices and thecurve shows the association

You can add or remove associated vertices usingselection management (see corresponding

section)

You can add a new curve to the association using thefirst icon

Select a curveYou can remove the current curve association usingthis icon

Select the first icon to select a curve and then

select a curveYou can remove all the associated curve using thethird icon

Student Notes:

Imagine and Shape

More About Associativity (1/4)


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M E S

If a curve is deformed then the surface willalso be deformed

To deform a curve see the CurveDeformation section

The mesh elements linked to the curves

are automatically moved

The surface is then recomputed

The vertices are still movable using either theModification function or by Vertex alignment

Student Notes:

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Low mesh density

High mesh density

Curve close to theinitial surface

Warning, the surface will never exactly follow the curve shape!To optimize the « morphing » between the curve and the surface, you have first to

create the curve as close as possible to the surface, and ensure that the mesh issufficiently dense to follow the curve during deformation.

Example 1: (Surface associated to Curve)


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Example 3: (Surface associated to Points)

Example 4: (Surface associated to Surface)

Student Notes:

Imagine and Shape

Other OperationsY ill l h f bdi i i f h d fi


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Other OperationsYou will learn how to create a symmetry of a subdivision surface, how to definethe working zone, and how to use Generative Shape Design functions in the

Imagine and Shape workbench.

Student Notes:

Imagine and Shape

How to Create a Symmetry


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C o p y r i g h t D A S S A U L T S Y S T

E M E S

In order to create a symmetry you need a subdivision surface and asymmetry plane.Select the Symmetry icon

Select the surfaceSelect the symmetry plane (The order of selection may be reversed)

If the surface and symmetry plane do not intersect the result is a

mathematical symmetry.

If the surface and symmetry plane intersect you have the option toselect one of the two solutions.

Student Notes:

Imagine and Shape

What is Defining the Working Zone


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E M E S

This function allows you to define a working area on a mesh in order tomodify only this part of the mesh.

A toolbar contains a dedicated option

NameToolbar

Swap selection

Icon

Tools Palette(For WorkingZone)

Student Notes:

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How to Define the Working Zone


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E M E S

Select the function iconSelect the surfaceSelect the elements that you want to modify using the selection toolsYou can swap the element selection. All protected elements becomeunprotected and vice-versa

Select the Modification icon and modify the elements in the working

zone.

In the Modification Tools Palette, click De/Activate Working Zone toreset the protection of selected elements.

Working Zone definition Swap selection

Modification of Surface


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Student Notes:

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Imagine and Shape RecommendationsYou will learn about general methodology and settings management.


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E M E S

g pYou will learn about general methodology and settings management.

Student Notes:

Imagine and Shape

General Methodology (1/7)


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E M E S

Create Subdivisionsurfaces

Split/Trim/Fillet inIMA Shapeoperations

Create the Solid andadd Dress Up in Part

Design

1

2

3

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Imagine and Shape


Use Shift trap as much as possible for mesh selection combined with views


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E M E S

Use Shift-trap as much as possible for mesh selection combined with viewsmanagement (F4).

Do not hesitate to use and customize Shortcuts to functions

Example:F10 – Hide/Show

Space – Modify

Use the Escape key to exit a function as much as possible and a shortcut toModification function, for example the Space bar.

Ergonomic advice:

Put your left hand on the left side of the keyboard for a quick access to:Control / shift

EscapeSpace

F4F2


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Student Notes:

Imagine and Shape

The mesh structure as well as the topology has to be carefully managed. This is



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The mesh structure as well as the topology has to be carefully managed. This isthe key to obtain the target shape.

Before starting to create a shape, it is recommended to analyze the topologystructure of the shape you have in mind.

Start then by creating a very light mesh structure corresponding to this shape,then by refining this mesh you will progressively get the final shape.

A good way is to determine the virtual sharp edges which are filleted afterwardwith GSD.

Example 1: Modeling a mouse

In most cases this has the following structureTo create the model start with a basic closed surface


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Student Notes:

Imagine and Shape


Example 3: Modeling a toy plane / Bad topology


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p g y p p gyThis example shows a bad structure and the importance of this in the final shape.

The main body of the plane is made of one basic shape and subdivision and extrusion are used toadd material. Since the main body is not divided into separate blocks it will be impossible to

achieve the correct shape.


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Use materials with reflections, for example Painting.

Settings Management (1/2)


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C o p y r i g h t D A S S A U L T S Y S

T E M E S

To have a nice reflection image on the material do thefollowing:

Open Apply Materials catalog

Select Painting tab

Right Click on « DS Dark Red » materialIn Rendering tab click this icon

Copy the address

Close all panels

In Tools/Options/Infrastructure/Material Librarypaste the address in Environment Image File field

Now apply any materials to the shape and ifnecessary increase the reflectivity value

Student Notes:

Imagine and Shape

Settings Management (2/2)

To improve the environment set the following:

Use two light sources with parameters


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T E M E S

Use two light sources with parameterssimilar to those shown.

Use a perspective view with an angle higherthan 15°(default value) to inspect thegeometry and to get a better feel for theshapes.

Use the ground in perspective view to get abetter feel for the vanishing lines.

Use two windows if possible, one in parallel view and theother one in perspective and with the ground.

You can switch from one to the other one rapidly usingControl-Tab keys.

Student Notes:

Imagine and Shape

Data Migration

In order to edit the subdivision surfaces created using CATIA level prior to R18, youneed to migrate these surfaces This can be achieved by using the Migration command


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T E M E S

need to migrate these surfaces. This can be achieved by using the Migration command

available in the contextual menu.

The old subdivision surfaces that need to bemigrated are highlighted in brown color in thespecification tree.

All the subdivision surfaces in the part aremigrated to R18 level.

Student Notes:

Imagine and Shape

Size Management

To have a better indication of the size of your model you can create a light skeletonwith some leading dimensions.


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T E M E S

g

Student Notes:

Imagine and Shape

In order to simplify data management, store Styling surfaces in one Geometrical Setand perform operations in another. The styling surfaces are then easier to find and

Tree Structure Management (1/4)


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T E M E S

p p y gmodify.

Avoid if possible the use of Ordered Geometrical Sets and PartBody containers tocreate Subdivisions or Styling CurvesExample:

Create Three Geometrical sets:One for the Styling surfacesOne for the Shape operations

One to contain the results of the Shape operations

Student Notes:

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Do the Shape operations inside the Operations Geometrical Set


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T E M E S

Student Notes:

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Copy the result with link of Shape operations inside the Results Geometrical Set, orcreate a Join containing the result. The access to key results is then faster and simple


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T E M E S

Student Notes:

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“Solid” operations are created in the PartBody


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T E M E S

Student Notes:

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Quality management 1/4

There are a number of rules to apply in order to improve surface quality and ensure offsetcomputation.


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Sharp Edges

Collinear tangencies

Group of faces to subdivide

Collinear tangencies

Subdivide sharp edged faces having collinear tangency corners.

In some cases and in order to simplify the mesh, delete unnecessary faces at the boundaries (seenext slide)

Student Notes:

Imagine and Shape



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Suppression of unnecessary faces at theboundaries (in order to simplify the mesh)

Subdivided group of faces

Refinement of boundaries (points alignment)

1

2

3

Student Notes:

Imagine and Shape


The Valence of a vertex corresponds to the number of connected edgesExample:


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Valence 2

Valence 3(internal)

Valence 4

Valence 5

Valence 6

Valence 3(border)

If Valence = « 4 internal » or « 2 border » or « 3 border » surface quality = C2

If Valence is different: the quality can be less (C1) but the surface can still be offset.


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Student Notes:

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Curvature

An even distribution of points is necessary in order to obtain good curvature.

The first illustration shows a good mesh distribution the shape is very smooth


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C o p y r i g h t D A S S A U L T S Y

S T E M E S

The first illustration shows a good mesh distribution, the shape is very smooth.

The second illustration shows a non homogeneous mesh distribution, the shape iswavy.

EDU_CAT_EN_IMA_FF_V5R18_toprint.pdf

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