View Full Version : 3DMax Daylight shadow/matt pass problem

02 February 2011, 10:53 PM

I have such problem.

Here's the example of the scene:
By deathevor ( at 2011-02-10

I've used mr Sky Portal and rendered it with Mental Ray (Final Gather and GI ON).

I also rendered Diffuse and Shadow pass, and everything worked ok.

But, my aim is to render the same image with Matte/Shadow/Reflection Material on the ground plane. (For later compositing on to Video footage)

So that what I get.

1) Rendered picture - Ok
By deathevor ( at 2011-02-10
Here's an Alpha channel for it. And first problem is that it doesn't have the area with reflected light in the front of the cube.
By deathevor ( at 2011-02-10

2) Shadow Pass - Fail (just empty RGB and empty Alpha channels)
By deathevor ( at 2011-02-10

3) Diffuse Pass - Fail (Some glitches + Shadow pass)
By deathevor ( at 2011-02-10
And basically the alpha channel for Diffuse pass is the same as for Render
By deathevor ( at 2011-02-10.

So really I can't make it work at all. I've tried with different lights (Phonometric, Daylight, Standard lights), with FG and GI off, different materials(Standart and Mental Ray) . But still the same result, Diffuse contains shadow pass and Shadow pass sometimes has some information, but mostly it's glitches.

Does anyone can suggest the way to make it work?

I also want to ask about this - Which Pass should I use to render this part separately from others? (I will remind that on Renderer and Diffuse pass the alpha didn't contain this area)
By deathevor ( at 2011-02-10


02 February 2011, 11:10 AM
try this:

hope that helps

02 February 2011, 12:49 PM

But it doesn't do anything with passes.

If I'm rendering everything as a single pass, it goes well.
The problem occurs only with separating the passes.

CGTalk Moderation
02 February 2011, 12:49 PM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.