Quad directly infront of the camera gives artifacts #18056

New Issue

Campbell Barton · 2008-12-06T02:56:57+01:00

Campbell Barton commented

2008-12-06 02:56:57 +01:00

%%%rendering a quad thats directly in front of the camera can give artifacts. (diagonal black area)
I have had this trouble more then once on 32/64 bit systems.

Attached a file with the artifact packed into an image.%%%

%%%rendering a quad thats directly in front of the camera can give artifacts. (diagonal black area) I have had this trouble more then once on 32/64 bit systems. Attached a file with the artifact packed into an image.%%%

Campbell Barton commented

2008-12-06 02:56:57 +01:00

Changed status to: 'Open'

Nobody commented

2008-12-06 02:56:57 +01:00

Changed status from 'Open' to: 'Archived'

Nobody closed this issue

2008-12-06 02:56:57 +01:00

blender-admin commented

2008-12-06 02:56:57 +01:00

#51914 was marked as duplicate of this issue

Martin Poirier commented

2008-12-08 06:08:39 +01:00

%%%It only shows that artifact when set to 50% render. Regardless of size settings (for certain resolution it might be more prominent), all presets gave the same kind of error along the diagonal, some a couple of pixel wide only but still there, again, only at 50%, not at 100%, not at 75% nor at 25%.

The black line has Z=max, so smells like a z buf error.

It's not a clipping problem (changing those had no effect).

Rotating all objects at once does remove the artifact, but only for rotations over 5degree or so.%%%

%%%It only shows that artifact when set to 50% render. Regardless of size settings (for certain resolution it might be more prominent), all presets gave the same kind of error along the diagonal, some a couple of pixel wide only but still there, again, only at 50%, not at 100%, not at 75% nor at 25%. The black line has Z=max, so smells like a z buf error. It's not a clipping problem (changing those had no effect). Rotating all objects at once does remove the artifact, but only for rotations over 5degree or so.%%%

Campbell Barton commented

2009-02-17 04:18:59 +01:00

%%%closed duplicate report
[#18282] Rendering bug depending on very specific values

Though the files from the report may be useful.%%%

%%%closed duplicate report [#18282] Rendering bug depending on very specific values Though the files from the report may be useful.%%%

Ton Roosendaal commented

2009-04-20 19:24:44 +02:00

%%%I have a similar file in my own "bugs" directory. On exceptional cases, indeed when values perfectly align, the zbuffer and clipping code have a numerical precision error. Intersections for clipping then go precisely through a vertex... this is like booleans you know!

The code for clipping is like a 100 years old, and quite nicely finetuned so it nearly always works. Fixing this I'd love to do once, but is on a very long todo... dont want to break stuff here.%%%

%%%I have a similar file in my own "bugs" directory. On exceptional cases, indeed when values perfectly align, the zbuffer and clipping code have a numerical precision error. Intersections for clipping then go precisely through a vertex... this is like booleans you know! The code for clipping is like a 100 years old, and quite nicely finetuned so it nearly always works. Fixing this I'd love to do once, but is on a very long todo... dont want to break stuff here.%%%

Bastien Montagne commented

2017-07-03 12:03:09 +02:00

Added subscribers: @Xerus, @brecht, @mont29

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Quad directly infront of the camera gives artifacts #18056