Hi all,

I am a Maya beginner. Here is what I am confused about:
-polygon object with blinn shader, renders fine in mental ray
-next, within the blin shader, I try applying an image file (jpg with b/w and color) on the diffuse slider to map & modulate amount of diffuse

the result shows up in
- viewport 2.0 ( harware texturing on): luminosity is used to modulate diffuse
- maya software renderer: same here
but not in mental ray ( object renders as before and diffuse map is ignored)

What would be the cause of this?
I tried the same with eccentricity and with similar outcome ( ignored in mental ray, ok in maya software)
further I tried with a png image. Here mental ray use the transparency of the image, but ignores luminosity.

Would this be normal, or am i missing some settings?

Many thanks,

Jill