Am 02.04.2017 um 19:09 schrieb Le_Forgeron:

> More important, which glass would you pick ?

To be frank, I don't find any of them particularly convincing. Most of
them seem to "swallow" light, while the 2nd from the left of each batch
seem to "emit" light.

For genuinely convincing glass material, I think it is essential...

- to control any desired tint via distance-based attenuation (`fade_*`
in interior block) rather than pigment (i.e. use `rgbt 1.0` as pigment)

- to control the balance between reflection and transmission via the
fresnel mechanism (realistic `ior` in interior block; `reflection { 1.0
fresnel on } conserve_energy` in the finish block)

It may also help to control the brightness of highlights via physical
parameters rather than tweaking (i.e. use `specular albedo 1.0` and
`fresnel on` directly in the finish block).


Of course it is also essential to provide a good environment to reflect,
and maybe the "not particularly convincing" impression I get might just
be due to the simple checker pattern. I'm not sure about that one.

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