Muting bump node alters material visibility #36628

New Issue

Shane Ambler · 2013-09-01T20:38:36+02:00

Shane Ambler commented

2013-09-01 20:38:36 +02:00

%%%FreeBSD 9.1 amd64 corei5 8GB nvidia GT520

I found a situation where a bump node between a wave texture and a glossy node will alter the visibility of the glossy shader when the bump node is muted.

I started following along with the examples in the Blender 2.6 Cycles Materials and Textures Cookbook. The scene contains a plane and a cube, the cube has a subsurf at level 4 making it appear like a sphere. The material for the cube is a diffuse and glossy into a mix shader, with a wave texture fed into the glossy roughness. This gives a striped mix of alternating glossy and diffuse material. Then the wave texture also gets multiplied and fed into the material output displacement.

The next step was to add a bump node fed by the wave texture and then going into the diffuse normal input. I also fed the bump node into the glossy normal. At this stage I muted the bump node to compare the effect and found the glossy appearance was partially cut off. Un-muting the bump node returns the glossy appearance.

Some experimenting found that the line that cuts off the glossy material is dependant on the viewing angle, as I rotate the viewport around the glossy material varies from fully visible to not visible. I see the same result with viewport as well as final render, as long as the camera is in the right position. I am attaching a copy of the file that should open with the viewport at around half glossy visible.

Testing on my machine shows that opening the attached file in 2.65 and 2.66a DOES NOT exhibit this

while 2.67b 2.68a and svn r59707 DO EXHIBIT the same problem.
%%%

%%%FreeBSD 9.1 amd64 corei5 8GB nvidia GT520 I found a situation where a bump node between a wave texture and a glossy node will alter the visibility of the glossy shader when the bump node is muted. I started following along with the examples in the Blender 2.6 Cycles Materials and Textures Cookbook. The scene contains a plane and a cube, the cube has a subsurf at level 4 making it appear like a sphere. The material for the cube is a diffuse and glossy into a mix shader, with a wave texture fed into the glossy roughness. This gives a striped mix of alternating glossy and diffuse material. Then the wave texture also gets multiplied and fed into the material output displacement. The next step was to add a bump node fed by the wave texture and then going into the diffuse normal input. I also fed the bump node into the glossy normal. At this stage I muted the bump node to compare the effect and found the glossy appearance was partially cut off. Un-muting the bump node returns the glossy appearance. Some experimenting found that the line that cuts off the glossy material is dependant on the viewing angle, as I rotate the viewport around the glossy material varies from fully visible to not visible. I see the same result with viewport as well as final render, as long as the camera is in the right position. I am attaching a copy of the file that should open with the viewport at around half glossy visible. Testing on my machine shows that opening the attached file in 2.65 and 2.66a DOES NOT exhibit this while 2.67b 2.68a and svn r59707 DO EXHIBIT the same problem. %%%

Shane Ambler commented

2013-09-01 20:38:36 +02:00

Changed status to: 'Open'

Brecht Van Lommel commented

2013-09-02 15:42:40 +02:00

%%%The way the Height input gets connected to the Normal output on mute it is not going to give good results.

Probably the heuristic can be tweaked here, in this case it only ever makes sense to bridge the Normal input to the Normal output. Lukas, maybe the logic should be tweaked like this?
http://www.pasteall.org/45309/diff%%%

%%%The way the Height input gets connected to the Normal output on mute it is not going to give good results. Probably the heuristic can be tweaked here, in this case it only ever makes sense to bridge the Normal input to the Normal output. Lukas, maybe the logic should be tweaked like this? http://www.pasteall.org/45309/diff%%%

Lukas Tönne commented

2013-09-02 19:09:52 +02:00

%%%Your reported issue has been fixed in SVN. Thanks for taking the
time to report!.%%%

%%%Your reported issue has been fixed in SVN. Thanks for taking the time to report!.%%%

Lukas Tönne commented

2013-09-02 19:09:52 +02:00

Changed status from 'Open' to: 'Resolved'

Lukas Tönne closed this issue

2013-09-02 19:09:52 +02:00

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Muting bump node alters material visibility #36628