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3D Studio Max material "addition"?

  Firstly, apologies for posting this question here. If there is a dedicated 3ds channel then I'll go there instead. Anyway!

In 3ds max 8 I've got 3 planes - one red, one blue and one green. Each plane slightly overlaps the other two.

What I am trying to do is produce the following effect:
Red and green added equally yield yellow, blue and green added equally produce cyan, blue and red added equally give magenta.
E.g. where the red plane overlaps the blue plane I want the overlapped section to appear magenta. Just like the standard light addition diagrams we've all seen in school. (like this one - http://wellmadewebs.com/public/atmo/images/layout/rgb1.jpg )

Does anyone know how I can do this?

Thank you in advance! I'm sure this is possible by my 3d skills are not yet up to speed. My client does not care about this however :)
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1 Solution
Ben McNellyCommented:
"If there is a dedicated 3ds channel then I'll go there instead"
- mmm, there should be ( hint hint!! )

This could be achieved in several ways. The best way would be to use a slightly translucent material shader on each plane. Probably a glass like material. this is going to be very hard to tweak. If i get some time tonight I will try and see what gives best results.

Another way would be to join all the meshes (in thier intertwined state) so you have one large mesh of 3 airplanes..
Then simply detach the areas where they intersect. Then color each piece acordingly.

Allot of this has to do with wether we are going for a translucent look, or purely illistrative - eg, not realy based on the translucet properties of the material to simulate color mixing, but solids that look like they change properties when they interact...

Its not beyond the scope of feasablility for 3ds to render the color addition corectly, just hard to achive with lighting being a pain and such...

heres a QUICK (as in proof of concept) example of the mesh seperation idea...
-> http://j3one.com/EE/3dsmax_1.jpg
RuneIndustriesAuthor Commented:
Thanks! What I really wanted was an answer like "Go to render properties, click on 'additive rendering'" :)

But this worked for me! Thanks!
Ben McNellyCommented:
good deal! From my experiance with max, there probably IS one of those buttons ;-) lol

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