Per Material IoR about luminary HOT 3 CLOSED

Good idea, I will try that out soon as it should be quite simple. As with the ocean and the toy though, the direct lighting will just ignore the refraction as I don't support caustics.

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So this is now implemented as of 18cc1e3. There are some things to note. Outside and inside are determined by the face normal, i.e., the face normal always points outside. Currently, the outside is always assumed to have a refractive index of 1, though I plan to account for ocean and toy refractive index if we are inside those. Also fully transparent objects will still be invisible even if their refractive index is not 1, this is mostly a performance thing and with my data driven design it would be a bit of a hassle to get rid of it, besides that, fully transparent objects are not all that realistic anyway.

It is also important to note that the material properties will be taken into account so by default refractions will be rough. Though I am thinking of making some changes to the parser so that it also supports non texture based material properties, i.e., you can just plug a number into the roughness and it simply takes that. The changes in the above mentioned commit makes this trivial to implement. I am just not sure yet how the global material override should interact with that.

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I am thinking of making some changes to the parser so that it also supports non texture based material properties, i.e., you can just plug a number into the roughness and it simply takes that.

🙂👍 Typically, renderers first look to see if there is a roughness texture and if there is, then the roughness property becomes a multiplier for each pixel of that texture. If there is no roughness texture, then the roughness is applied evenly to the surface…

I am just not sure yet how the global material override should interact with that.

The global material setting could be a fallback instead of an override. I think the material settings defined in the .mtl file should take priority over those defined in the .lum file.

In any case, thank you for what you have already accomplished 🙏

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