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A prism displayed using caustics, and motion blur. The basic scene is a square pyramid sitting on a white floor with a narrow white light shining at one of the edges:
The render shows the spectral display cast by the prism:
The scene was set up using 16x motion blur to simulate the fact that the refractive index differs for different wavelengths of light. The light animates from dark to blue to green to red to dark, at the same time the refractive index of the glass material animates.
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The time line looks like this:
| The project settings:
Coupled with a frame rate of 30 in the render settings Output page, this aggregates 15 render frames for each output frame. |
Motion Blur Settings:
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The refractive index settings I used were: blue fade 1.8 |
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This is based on two fabulous examples:
How to construct rainbow glass by Oliver Pietern
This describes how to vary the refractive index by wavelength to get a spectrum.
and
This describes how to use motion blur to combine several frames into a still.
