Plane with apsorbtion volume cast strong shadow #44524

New Issue

lopata · 2015-04-27T17:00:26+02:00

lopata commented

2015-04-27 17:00:26 +02:00

win7 x64

blender version 2.74 '55b7a8c'

I do no know it is bug or not, but it look strange

absorb_plane.blend

win7 x64 blender version 2.74 '55b7a8c' I do no know it is bug or not, but it look strange ![Screen.jpg](https://archive.blender.org/developer/F167330/Screen.jpg) [absorb_plane.blend](https://archive.blender.org/developer/F167332/absorb_plane.blend)

lopata commented

2015-04-27 17:00:26 +02:00

Changed status to: 'Open'

lopata commented

2015-04-27 17:00:26 +02:00

Added subscriber: @lopataasdf

Sergey Sharybin self-assigned this 2015-04-28 10:51:23 +02:00

Sergey Sharybin commented

2015-04-28 10:51:23 +02:00

I don't really think it is a bug, more like a specific of using volume BSDF on a plane which doesn't have volume (which makes it so light enters the volume and never leaves it, sorta "black hole" effect depending on which side you're looking onto the plane :)

But before calling it so, would want to have some deeper check, so assigning to self with low priority.

I don't really think it is a bug, more like a specific of using volume BSDF on a plane which doesn't have volume (which makes it so light enters the volume and never leaves it, sorta "black hole" effect depending on which side you're looking onto the plane :) But before calling it so, would want to have some deeper check, so assigning to self with low priority.

Brecht Van Lommel commented

2015-05-01 14:58:05 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2015-05-01 14:58:05 +02:00

Brecht Van Lommel commented

2015-05-01 14:58:05 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2015-05-01 14:58:05 +02:00

Yes, this is basically not supported, the mesh must be closed, if you extrude it into a cube it works as expected.
http://www.blender.org/manual/render/cycles/materials/volume.html#mesh-topology

What happens is that shadows rays leaving the surface will enter the volume as they hit the plane, and then think the remaining distance up to the light is inside the volume, which gives these dark shadows.

Yes, this is basically not supported, the mesh must be closed, if you extrude it into a cube it works as expected. http://www.blender.org/manual/render/cycles/materials/volume.html#mesh-topology What happens is that shadows rays leaving the surface will enter the volume as they hit the plane, and then think the remaining distance up to the light is inside the volume, which gives these dark shadows.

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Plane with apsorbtion volume cast strong shadow #44524