Volume Scattering Test Assets

[MiiBond]

Here are a couple of possible conformance assets to test KHR_materials_volume_scatter.

The first one test varying values for anisotropic scattering:

The second one tests varying scattering colours and attenuation distances while attenuationColor is held constant. As multiscatterColorFactor tends to black, scattering is replaced by attenuation.

[MiiBond]

Here are renders in Babylon.js:

[MiiBond]

I've updated the second asset now to vary multiscatterColorFactor from yellow to black on the X-axis and vary attenuationDistance on the Y-axis. When scattering is black, there will no longer be any scattering. However, the attenuationColor is constant for every material and so the scattering will be replaced by absorption as the multiscatterColorFactor tends to black.

I also added text labels for the axes.