Refraction Layer

7/22/2019 Refraction Layer

1/19

VRay for SketchUp Manual

Refraction Layer

Open file: Chairs-Refraction-Original.skp. We are going to introduce how to add and edit the refraction layer."Materials Editor" icon over V-Ray toolbar to edit chair material.

Add Refraction Layer

1.Click on the "+" to the right of the Chair_Red, and then right click on Refraction Layers. Select Add new layer.the right of the window.


2/19

Controlling the amount of transparency

2.If you don't see the transparency from the material preview window, that's because the Transparency is set toTransparency. Click on the color and change it to white, which will give you 100% of transparency to the material


3/19

3.Click on the Update Preview again and you will see the transparency, but without its original red color. When ymatter what you have for diffuse color, it will not show up. It will render like the image at the bottom.


4/19

The color of refractive materials

When you want to apply color to a refractive material, the best way to do this is through the Fog Color, which is ldialog box.

4.Click on Fog Color and change it to the same color as the original Diffuse Color. Click on the Update Preview amaterial this time.


5/19

Image on the left is what you will get. Do the same changes to the other two colors and you will get the image loEnvironment, change the background color from black to white and see what you will get this time.


6/19

Fog Settings Explained

The appearance of Fog depends on three parameters; Fog color, Fog Multiplier, and object size. The Fog color is

can make it hard to achieve your desired effect. It is best to set your color to a very light or desaturated versiondetermined by the Fog color and the object size. The objects size is important because Fog is created by calculatiTherefore, a larger object will absorb more light than a smaller object. This means that a single setting will not nobject to object. The image below is two spheres with the same material applied to them, but the sphere on thebelow are tests of different multipliers with a saturated and desaturated color.

Fresnel IOR: 1.55Refract IOR: 1.55IOR: 1.55Fog Color: R244, G250, B230


7/19

Fresnel IOR - 1.55Refract IOR - 1.55IOR - 1.55Fog Color - R175, G250, B0

Adjusting Refractions with Index of Refraction

IOR (Index of Refraction) is used to calculate among of the light refracted from a transparent object. The newly athe chart for typical objects' IOR value.


8/19

Default set the Refraction IOR to 1.55; please refer to the images below for setting the IOR to create your desire

Please note that reflection and refraction IOR values are separate, but to achieve an accurate effect t


9/19

The Glossiness of Refractive materials

Both refractive objects and reflective objects have an option setting for Glossiness. The difference is that Reflectiwhereas Refraction Glossiness will have an effect on the objects transparency.

The Glossiness of a refractive object is usually used to represent different type of glass, for example, frosted glasthe value is decreased, and at a certain point these refractions will become so blurry that they prevent what is be


10/19

Refraction Glossiness default is set to 1.00, please refer to images below for impacts on different settings of Refr

Images below set the Refraction IOR to 1.55, you can see the Glossiness changes gradually from 0.85. It changesetting for Refraction Glossiness remains the same, different Refraction IOR will change the Glossiness of the obj

Just like the intensity of the Fog Multiplier affects its transparency, the Refraction Glossiness in thicker objects be


11/19


12/19

Image below shows the influence of Refraction Glossiness material to objects behind it. Objects further away bec


13/19

Shadows of refractive materials

There is an Affect Shadow option to the right hand bottom corner of the Refraction dialog box, default is unchecktransparent object will affect its shadow and it's not black anymore. The shadow also becomes more depth as wel

It is recommended to always have Affect Shadows checked, as it produces a more realistic effect.

Images below show the difference with and without the Affect Shadows checked.


14/19

Double-sided material

Under Options of each material, you will find this Double-sided selection. Default setting is checked. This option i

material. When this option is unchecked, light that enters the inside surfaces will not be rendered and show up blsometimes you may want to uncheck this option when render object with translucent material in order to get the

Unless you want to create some special effects, please have this option checked.

The double sided option will not have any affect on the shadows of the object.


15/19

Translucent material

We've talked about changing the Diffuse color to get the degree of transparency we want to create before. White100% opaque. You can create translucent materials with colors anywhere between white and black. But now wematerial. It is related to special light absorption materials.

Open file: Translucency.skpand render it, you will get image like below. You will see that colors where partitiothe box are darker. This is because the thickness of the object changes and the light travel distance changes alsocreate this kind of material, you have to check the Translucency option under the Refraction.


16/19

Check the Translucent box under Translucency first. Thickness is for control of light pass through the object, thesettings as default. Other items required to change include:


17/19

1.Double-Sided must be unchecked so the light can get through to the inside of the object. This setting is extre

2.Change the IOR to 1.

3.Decrease the Refraction Glossiness to a value below 1.

4.Do not use white color for the Transparency because that will turn the object to completely transparent and bemuch light. Do not use black color, either. That will not allow light get through the object at all. Pick a color anywbest result.

Many rendering engines use Sub-Surface Scattering (SSS) to create this kind of material. This material is good fcheese, plastic and jade which all have a little translucency in it.

Translucency is created by absorbing light to the object's surface so the color of the object will show up a little dathat it's too dark even though the original color is set to the highest Val 255, the best way to fix it is increasing t

Below are some examples.


18/19


19/19

Refraction Layer

Documents