no specular with opacity-maps?

[deneb26]

Hi there

i recently encountered a problem with a rendering which i want to show you.
compare the two pics below. on the one above the material is quite reflective/glossy.
on the second the speculars are completely missing due to a opacity-map i applied to the geometry respectively.
could anyone point out the mistake i did?
thanks in advance.

glossy:



with opacity-map / non glossy

[jow]

Hi, you need to un-lock the refection fresnel ior then it should be ok.

[deneb26]

thanks jow

that did the trick!

greetings
ale

[MoonDoggie]

I'm confused why this made a difference? The checkbox only dictates whether the default value of 1.6 is locked or not...

[vlado]

This is corrected for SP2, but the actual reason for the problem is that there is somewhat more complicated logic behind this, which has to do with volume shaders - when you use the fog color, V-Ray creates a volumetric shader for the object; there is an optimization to not create this shader if the object uses opacity mapping and has a white fog color. There was a small bug there that caused the original issue in the thread.

Best regards,
Vlado

[MoonDoggie]

Excellent, thanks for the headsup Vlado.