I try to make an exterior scene and I need large surfaces covered with grass and trees.Because of RAM and huge render time I can't render those stroke with mentalray, insted I chose to render the basic geometry(the buildings) with MentalRay and the Paint Effects with MayaSoftware in 2 steps:
1. I rendered the scene with MR and Z depth - image format IFF
2. I rendered only paint effects with Maya Software - image format IFF- providing the Z depth from the previously rendered image ,and let Maya do the compositing.
As you can see in the image below Maya don't seem to understand alpha or Zdepth from MentalRay and strokes are visible only outside the alpha.
If I render the geometry with Maya sw ( at step 1) everything works well.
Can anyeone help?Thanks