Artifacts when baking normals #18989

New Issue

Andy Davies · 2009-07-05T21:35:34+02:00

Andy Davies commented

2009-07-05 21:35:34 +02:00

%%%Hey guys,

When i bake the normals from the HP in the attached file, to the LP plane, i am getting artifacts.

They range from single pixels being the wrong colour to jagged edges where straight lines should be.

My System is the following:-

AMD Athlon 5600+
Vista 64bit SP2
Nvidia Geforce 8800GTX with 186.18 drivers.
8GB DDR2 RAM
Blender 2.49a (64bit)

I get the same results in 2.48a (64Bit) also but the artifacts are much worse.

The image is 4k, so be cautious when rendering as it takes lots of memory :P

Any ideas?

Thanks for looking :)%%%

%%%Hey guys, When i bake the normals from the HP in the attached file, to the LP plane, i am getting artifacts. They range from single pixels being the wrong colour to jagged edges where straight lines should be. My System is the following:- AMD Athlon 5600+ Vista 64bit SP2 Nvidia Geforce 8800GTX with 186.18 drivers. 8GB DDR2 RAM Blender 2.49a (64bit) I get the same results in 2.48a (64Bit) also but the artifacts are much worse. The image is 4k, so be cautious when rendering as it takes lots of memory :P Any ideas? Thanks for looking :)%%%

Andy Davies commented

2009-07-05 21:35:34 +02:00

Changed status to: 'Open'

Andy Davies commented

2009-07-05 21:39:42 +02:00

%%%Just a quick note...
You might have to zoom in to see the problem as i when i view the jpg's in Firefox everything looks ok.%%%

%%%Just a quick note... You might have to zoom in to see the problem as i when i view the jpg's in Firefox everything looks ok.%%%

Andy Davies commented

2009-08-08 12:24:54 +02:00

%%%Any ideas on what could be causing this guys?

Thanks for looking :)%%%

%%%Any ideas on what could be causing this guys? Thanks for looking :)%%%

Tom Musgrove commented

2010-05-24 06:09:22 +02:00

%%%Also exists in 2.5 so moving to 2.5 tracker%%%

Diego Borghetti commented

2010-06-03 17:17:59 +02:00

%%%Hi Andrew,

Is the bug still there ? can you test in the render25 branch ?

Diego%%%

%%%Hi Andrew, Is the bug still there ? can you test in the render25 branch ? - Diego%%%

Andy Davies commented

2010-06-03 18:59:02 +02:00

%%%Hey Diego,

I just tested with the Render Branch (28935 win32) and the errors still appear.

Attached is a copy of the result with the errors highlighted.

Hope that helps!

Thanks for looking :)%%%

%%%Hey Diego, I just tested with the Render Branch (28935 win32) and the errors still appear. Attached is a copy of the result with the errors highlighted. Hope that helps! Thanks for looking :)%%%

Campbell Barton commented

2010-06-14 08:31:37 +02:00

%%%this bug happens for me too. 64bit ubuntu, trunk r29440%%%

Brecht Van Lommel commented

2010-07-23 15:09:10 +02:00

%%%The problem here is floating point precision, because the triangles line up exactly with pixels here. It's worse because baking doesn't support antialiasing, if that was added it would be much less noticeable. Moving the meshes slightly or changing the image resolution avoids the problem.

I'm not going to consider this a bug, the code could be tweaked for better precision but this kind of problem is impossible to avoid with raytracing without introducing other problems. Some raytracers provide a tweakable epsilon value that provides a tradeoff, but I'd rather not add that.%%%

%%%The problem here is floating point precision, because the triangles line up exactly with pixels here. It's worse because baking doesn't support antialiasing, if that was added it would be much less noticeable. Moving the meshes slightly or changing the image resolution avoids the problem. I'm not going to consider this a bug, the code could be tweaked for better precision but this kind of problem is impossible to avoid with raytracing without introducing other problems. Some raytracers provide a tweakable epsilon value that provides a tradeoff, but I'd rather not add that.%%%

Brecht Van Lommel commented

2010-07-23 15:09:10 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2010-07-23 15:09:10 +02:00

Atle Olsson commented

2011-03-26 00:14:07 +01:00

%%%Still present on 2.56...................
Quite noticeable when baking normalmaps from bumpmaps. Workaround are to make a normalmap of twice the scale, and then scale it down in a image editor later.%%%

%%%Still present on 2.56................... Quite noticeable when baking normalmaps from bumpmaps. Workaround are to make a normalmap of twice the scale, and then scale it down in a image editor later.%%%

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Artifacts when baking normals #18989