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- Date: 2010-09-09 05:31
- Sender: Elia Sarti
- I'm not sure I understand this.
To my knowledge the "Receive Transparent" option for shadows makes so that the material will have shadow casted on from objects with (semi-)transparent materials (e.g. glass).
I don't see any transparent objects in the test file, am I missing something?
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- Date: 2010-09-10 02:38
- Sender: john armonk
- That is part of the issue. There are no transparent objects in the test scene. Blender seems to automatically assume other objects are transparent when "Receive Transparent" is turned on, and applies a shadow based on its diffuse color to the diffuse pass, making it difficult to composite shadows over a diffuse pass which already contains them.
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- Date: 2010-09-26 03:04
- Sender: john armonk
- I've attached another example that clearly shows the problem as I was working on an object earlier. What is rendered by default is only the diffuse pass. Note the projection of the object's colors on the plane. There are NO transparent objects however. The render engine is considering every object to be semitransparent. I wanted to add soft shadows via a Bilateral Blur node, but I can't do that accurately because of these artifacts.
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- Date: 2010-09-26 03:07
- Sender: john armonk
- apologies, added the same file again. Check the one labeled "trashadow_error_2.blend"
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- Date: 2010-11-12 00:34
- Sender: john armonk
- Ok, I see that the shadow pass has been fixed. Still, there is a ghosted colored shadow in the diffuse pass! This fixes nothing. It is still impossible to composite shadows over a bare diffuse pass without the weird transp shadow in the way.
Perhaps making the colors of the transparent shadow part of the shadow pass, rather than the diffuse, since the shadow pass can contain RGB too?
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- Date: 2010-11-15 21:48
- Sender: john armonk
- Ok, I see that the shadow pass has been fixed. Still, there is a ghosted colored shadow in the diffuse pass! This fixes nothing. It is still impossible to composite shadows over a bare diffuse pass without the weird transp shadow in the way.
Perhaps making the colors of the transparent shadow part of the shadow pass, rather than the diffuse, since the shadow pass can contain RGB too?
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- Date: 2010-11-16 00:30
- Sender: john armonk
- Ok, I see that the shadow pass has been fixed. Still, there is a ghosted colored shadow in the diffuse pass! This fixes nothing. It is still impossible to composite shadows over a bare diffuse pass without the weird transp shadow in the way.
Perhaps making the colors of the transparent shadow part of the shadow pass, rather than the diffuse, since the shadow pass can contain RGB too?
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- Date: 2010-11-16 21:35
- Sender: john armonk
- Ok, I see that the shadow pass has been fixed. Still, there is a ghosted colored shadow in the diffuse pass! This fixes nothing. It is still impossible to composite shadows over a bare diffuse pass without the weird transp shadow in the way.
Perhaps making the colors of the transparent shadow part of the shadow pass, rather than the diffuse, since the shadow pass can contain RGB too?
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- Date: 2010-11-19 08:43
- Sender: Janne Karhu
- Assigned to self for investigation.
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- Date: 2010-11-19 16:18
- Sender: Janne Karhu
- The transparent shadows were indeed effecting the diffuse pass, but nobody really knew why :) Problem solved by removing the code (fix in r33182), so now the diffuse pass should be clean. Closing the report.
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