Computer Visualization BIM Curriculum 03
Jan 09, 2016
Computer Visualization
BIM Curriculum 03
Topics
History Computer Visualization Methods Visualization Workflow Technology Background
Technology Timeline
1960 1970 1980 20001990
Gou
raud
Sha
ding
Pho
ng S
hadi
ng
Bum
p m
appi
ng
Com
mer
cial
3D
CA
D
Ray
Tra
cing
CA
D fo
r P
C
JPE
G/M
PE
G
Rad
iosi
ty
Ado
be P
hoto
shop
XM
L
Qui
ckT
ime
/ Ope
nGL
VR
ML
„Com
pute
r G
raph
ics”
te
rm u
sed
first
Hid
den
Line
Alg
orith
m
Firs
t Vid
eo G
ame
Mou
se in
vent
ed
http://accad.osu.edu/~waynec/history/timeline.html
Visualization Techniques Photorealistic
images (rendering) Artistic images Fly through
animations Sun studies Virtual Reality (VR)
NHS office complex by paastudio
Standard BIM Visualization Workflow
Images
Animations
VR
BIM Model
RenderingEngine
VREngine
AnimationTool
BIM APPLICATION
Complex Visualization Workflow
Images
Animations
VR
ExternalRenderingApplication
ExternalVR
Application
ExternalAnimationApplication
BIM Model
BIM APPLICATION
ExternalMovie-editingApplication
ExternalImage-editing
Application
Photorendering
Objective: Creating photorealistic
images based on the BIM model using an internal or external rendering engine
Process:1. Modeling2. Scene layout setup 3. Rendering
NHS office complex by paastudio
Scene Layout Setup
1. Adjusting the materials Texture positioning Color adjustment Shininess Bump mapping, transparency
2. Light Settings General light Sun light Brightener lights
3. Placing Cameras Positioning Camera angles
Computer Shading Techniques
Flat ShadingShades each polygon of an object based on
the angle between the polygon's surface normal and the direction of the light source
Gouraud ShadingSimulates the differing effects of light and
color across the surface of an object
Phong Shadingimproved version of Gouraud shading that
provides a better approximation of light and color
http://www.wikipedia.org/
Computer Rendering Techniques
Ray Tracingis a general technique of studying the
path taken by light by following rays of light as they interact with optical surfaces
simulate light reflecting only once off each surface
Radiosityis a global illumination algorithm that
simulate the many reflections of light around a scene, generally resulting in softer, more natural shadows and reflections then Ray Tracing
http://www.wikipedia.org/
Advanced Rendering Techniques
Texture mappingWrapping a texture image onto a
surface to create a realistic representation
Bump mappingSimilar to texture mapping but the
map image adds roughness to the model
Depth of FieldObjects appear blurry when too far
in front of or behind the object in focus
http://www.wikipedia.org/
Non-photorealistic RenderingsObjective: Creating artistic style images based on the BIM
model using special rendering engine and/or photo editing software
Process A:1. Modeling2. Scene layout setup 3. Non-Photorealistic Rendering
Process B:1. Modeling2. Scene layout setup 3. Photorealistic Rendering4. Modifying the image in a photo-editing
software
NHS office complex by paastudio
Non-photorealistic Renderings
Images were made with Piranesi software from Informatix
Artistic rendering applications support various painting styles:
Pencil Ink Ball-Pen Water-colour Oil-colours
Fly Through Animations
Objective: Creating movies of the building
along a predefined camera path, based on the BIM model, using internal or external animation tools
Workflow1. Modeling2. Scene layout setup3. Defining camera path4. Movie calculation
Animation Basics Animation is the optical illusion of motion created by
the consecutive display of images of static elements. In computer animations each frame of the movie is
produced individually by a computer software. When the frames are strung together there is an illusion
of continuous movement Typical Frame rates are 12-25 frames per second
http://www.wikipedia.org/
Sun StudiesThe sun study is a special type of
computer animation. The objective of making sun studies is to visualize the natural lighting conditions on a given location of the building at a particular day of the year. Unlike in fly through animations the camera position is fixed while the sun location is continuously changing
Workflow1. Modeling2. Scene layout setup3. Day settings4. Sun study calculation
Virtual Reality (VR) Virtual Reality (VR) is an environment that is
simulated by a computer. Most virtual reality environments are primarily for
visual purposes VR-s provide more freedom for the users in
exploring the building then pre-recorded animations
Workflow1. Modeling2. Scene layout setup3. VR camera settings4. VR calculation
QuickTime VRQuickTime VR is a type of interactive movie
supported by Apple's QuickTime file format. QTVRs can be "stitched" together from several normal photographs, or captured with specialized panoramic cameras, or rendered from 3D-modelled scenes. There are two types of QuickTime VR-s:
QuickTime VR (QTVR) Panoramas are panoramic images which surround the viewer
with an environment (inside, looking out), providing a sense of place.
QuickTime VR (QTVR) Objects are captured from many locations pointing in
toward the same central object.