Versions 3.7.0 and earlier of POV-Ray don't support Fresnel highlights
for non-metallic objects. The attached program is an attempt to find
reasonable specular highlight compromise values for glossy non-metallic
In version 2.0, the formula is updated to cover low IORs, and low IOR
test cases are added to the scene accordingly. The formula breaks down
at IORs above 3.0 or so, but there are not many non-metallic materials
with such high IORs.
If you are using POV-Ray 3.8 or later, you should use finish-level
Fresnel instead of consulting this program.
Post a reply to this message
Download 'hilite_compromise-2.0.zip' (2 KB)