I have some questions about the extra prepass in rendering image sequences in Vray 2.40 in MAX 2012 64bit.
Here's my procedure of making my scene.
1. I'm making a complex scene contains some FP objects and RC objects.
2. I put all the forest objects in one "Forest" layer. And I put all the Railclone objects in one "Railclone" Layer. And I put all the other objects in "Another" Layer.
Here's my procedure of rendering my scene.
1. I unhided all the objects in my scene. And Set my Primary GI engine and Secondary GI engine to "Light Cache". I checked the "Use camera path". I choose the "fly-through" mode in "light cache" and saved the VRLMAP file. I got VRLMAP file After my render.
2. I set the Primary GI engine to "Irradiance map" and the Secondary GI engine to "Light Cache". I checked the "Use camera path" in "Irradiance map" tab. I choose "Incremental add to current map" mode to save my VRMAP file. I choose the "From file" mode in "Light Cache" tab and choose my VRLMAP file I saved in step 1. Finally I rendered my image sequences every 25th frame. I got the VRMAP file of the "Irradiance map".
3. I set the Primary GI engine to "Irradiance map" and Secondary GI engine to "None".
I choose the "From file" mode in "Irradiance map" tab and choose my VRMAP file I got in step 2. I render the real image files finally.
Some FP objects contain some animated trees.
I checked all the materials in my scene. There was no "Refraction_useInterpolation" or "Reflection_useInterpolation" checked in my Vray materials.
My questions are,
1. Why did I get two extra prepass of calculating "Irradiance map" in step 3 of my render procedure ?
2. Why the two extra prepass of calculating "Irradiance map" were gone if I turn the "Forest" layer off ?