Indigo Renderer Forum

Here is pretty nice tutorial on how to use texture>effects>ambient occlusion in the alpha channel of your material to get dirt in deeper places. in c4d. I often need to render polished bronze which has a similar effect.

http://www.3dluvr.com/carles/Tut02en.htm

Anyone know how to do this in indigo/cindigo? I usually just do "convert materials" in the c4d plugin menu, but that doesn't work this time.

Indigo doesn't know Ambient Occlusion, because it's some kind of biased renderer accurancy enhancement fake.
The only way to use your technique is a mix material with a mask texture, containing the baked ambient occlusion pass of the object as a greyscale image.

So try the following:
- Choose you object and say "Render > Bake object".
- In the upcoming dialogue, you should only choose "Ambient Occlusion".
- Specify your output path and "Bake".

C4D will disable your original object and place a new one above it, attached a material with the baked textures.
If you check your baking output path, you will find a generated Ambient Occlusion texture. There's no need to unwrap your object properly; C4D will generate an UV Layout for you.

Anyway: this generated texture could be used as the mask for your two metal materials.
If you are not sure how to use mix materials, have a look in the manual, otherwise go to the material database here; there you will find numerous materials using this technique.

I hope I could help you!

heh. sometimes biased renderer accurancy enhancement fakes are good for things they weren't designed for. But the baking solution sounds sweet, if i figure baking out I could probably get some other c4d material tricks into indigo. So tnx for the tips!

For sure,

and post your results with this technique! The screws look very nice with that...