Prelighting Mental Ray Problem?

Maya
1

Hi:
I have setup a simple scence to bake mental ray:
A ball on a plane and all are surround in a big ball assignned a pure white surface shader

when I render it by mental ray it looks great..However when I use Edit polygon->Color->Prelight(metal ray) , the showdow was gone and I did check Cast Shadows in Backing options. Does anybody know where the problem is?

Note: The reason for baking is use for 3DVR, I try convert to file texture(maya software) before but I think baking mental ray looks more realistic.

Thanks

Liuima

2

What shadow?

3

Let's see the UVs of the baked surface

4

There's a policy that only ma files should be posted.