Optimize the Ambient Occlusion Mapping

[*Rob*]

Hi Guys.

I'm having trouble rendering a shadow map to a texture using the mental ray batch baker.

I used this tutorial to setup the ambient occlusion. When i render the scene, then everything looks fine. But when i'm going to batch bake the shadow map, then the result is absolutley awful.

The mapping is ok, the model is an ingame model of a Porsche RS Spyder Evo. Take a look at the pictures to see what i'm trying to say. The HD1080 Render is what i would like to have as result and the 2K square map is what i get. I only baked the main body shadow. I don't know why there are so many black faces.

The grainyness is a bit high because the samplerate of the occlusion map is only set to 64 to reduce rendertime.

I used exactly the same settings as the tutorial. Even with 256 samples, the texture looks like this.

Hope someone can help me.

regards
Rob