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  • Start off by opening the Maya scene file Refractive-Caustics_Start.ma. The scene contains a basic object to start off with. Create a polygon floor plane and position it underneath the mesh.
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Emissive Plane

  • Create another plane and position it above the mesh as indicated below.

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  • Assign an Ai Standard shader to the polygon plane above the polyon mesh. This will represent our light source. Decrease the Diffusevalue of the Ai Standard shader and increase the Emission to around 10.
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Mesh Shading

  • Assign an Ai Standard shader to the polygon mesh that we want to generate the Refractive Caustics. We are going to make this a glass shader. Before we do that, we must first ensure that the Opaque flag is disabled. Select the polygon mesh and in the Attribute Editor, disable Opaque in the Arnold attributes.

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  • Connect the ramp to the Transmittance attribute of the Ai Standard shader.
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Refractive Caustics

In order to see Refractive Caustics through our glass, we must enable them in the Ai Standard shader that is assigned to our glass mesh. Caustics can be found under Emission in the Ai Standard attribute editor. Click on Enable Refractive Caustics.

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Noise

To reduce noise in the Refractive Caustics, you must increase the number of GI Diffuse Samples

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