Creating a Shadow Matte on Grass

[leejk]

Hi,

I have an environment scene that I have rendered a camera animation in, and now I want to composite in a vehicle. The problem is the shadow that the vehicle casts. I have setup the ground mesh and Forest Pack object to act as matte objects using the option in the VRay properties dialog. This creates a matte shadow, but it does not look right when composited. It looks too light and does not blend well; just looks wrong. I am wondering if there is a better way of doing this? Honestly it kinda looks like the grass is somehow subtracting from the alpha matte the ground mesh is generating, so that there are "holes" in the matte that do not correspond to the blades of grass.

thx

[RealViz]

I think you just need to increase the "max trasparency level" in the renderer in Global section.