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VRay.com - Your source for all things VRay  ::  VRay for SketchUp  ::  Manual  ::  Caustics

VRay for SketchUp Manual

VRay for SketchUp Manual

Caustics

What are Caustics?

Caustic is a lighting phenomena created by some materials, for example, metal, glass and liquid which either reflect or refract light around the object. This happens when the light becomes focused by the materials resulting in a pattern of bright light.

Caustic examples

Open file: Chairs-Caustics-01.skp, open V-Ray for SketchUp's Render Options. Pull down the Caustic control panel at the bottom. Check the on to open the Caustic effect.

Setting up Caustics in V-Ray for SketchUp

At the beginning of the render the progress window will say that it is calculating caustics. Depending on the number of lights and the caustic subdivisions of each light this process may be very quick or take a few minutes.

Setting up Caustics in V-Ray for SketchUp

Examples

Image on the left is rendered without Caustic effect. Image on the right is rendered with it. The values of Max Photons, multiplier, and Caustic Subdivs are all using default setting. With the image on the left you can see a slight caustics effect. This is due to the Affect Shadows option. This option is actually trying to fake the caustics effect seen on the right.

Caustic examples

Go back to the Caustic's control panel. Render it again with the Max Photons changed from 50 to 300, as the image on the right. Compare with the image below and you will find the Caustic effect is greater this time and smoother.

Usually it's easier to spot the Caustic effect in a darker scene. If the scene is brighter, you can try increase the Multiplier to offset the difference.

Caustic Multiplier settings in V-Ray for SketchUp

Caustic Multiplier render in V-Ray for SketchUp

If you want to control the quality of Caustic even better, other than increase the intensity of light, you can also increase the Subdivs under Sampling from 1000 to 2000 or even higher. But this will increase the prepare time for render Caustic effect.

Image below is rendered with Caustic Subdivs set to 3000, you can see the better quality of Caustic effect in this case.

Caustic Sampling settings in V-Ray for SketchUp

Caustics example in V-Ray for SketchUp



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News News

Wednesday, April 5, 2017

V-Ray 3 for Rhino Now Available

V-Ray 3 is built to be the smartest and fastest renderer for Rhino. It's clean. It's simple. And it's now faster than ever to create great-looking renders right in Rhino.


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