Distorted strokes while painting small brush in UV/Image + low performance #35372

New Issue

Jiri Caslava · 2013-05-15T12:43:26+02:00

Jiri Caslava commented

2013-05-15 12:43:26 +02:00

%%%--- Operating System, Graphics card ---

Tested on Win Vista 64, Linux 64, various GPU (Nvidia, Intel)

- Blender version with error, and version that worked ---

blender-2.67-r56809
Worked in 2.66

- Short description of error ---

Painting by very small brush (size 1-2) in UV/Image editor on low view zoom (~1/4) make distorted strokes (evenly missing pixels - like shading in 1-bit image). Also painting is very slow and consumes a lot of memory. Larger brushes are much faster, which doesn't make sense - more pixels to write.
Works in 2.66 - properly filled strokes, more than 10x faster and 10-100x less memory during and after painting. Looks like memory leak.
Speed issue may be related to #35057 bug (3D paint).

- Steps for others to reproduce the error (preferably based on attached .blend file) ---

Try paint in UV/Image editor and then zoom to painted strokes in attached .blend.
%%%

%%%--- Operating System, Graphics card --- Tested on Win Vista 64, Linux 64, various GPU (Nvidia, Intel) - Blender version with error, and version that worked --- blender-2.67-r56809 Worked in 2.66 - Short description of error --- Painting by very small brush (size 1-2) in UV/Image editor on low view zoom (~1/4) make distorted strokes (evenly missing pixels - like shading in 1-bit image). Also painting is very slow and consumes a lot of memory. Larger brushes are much faster, which doesn't make sense - more pixels to write. Works in 2.66 - properly filled strokes, more than 10x faster and 10-100x less memory during and after painting. Looks like memory leak. Speed issue may be related to #35057 bug (3D paint). - Steps for others to reproduce the error (preferably based on attached .blend file) --- Try paint in UV/Image editor and then zoom to painted strokes in attached .blend. %%%

Jiri Caslava commented

2013-05-15 12:43:26 +02:00

Changed status to: 'Open'

Brecht Van Lommel commented

2013-05-15 12:49:31 +02:00

%%%What do you mean by 10-100x less memory during and after painting? How are you measuring that, what are the numbers?%%%

Brecht Van Lommel commented

2013-05-15 16:46:50 +02:00

%%%I fixed the distorted strokes now, and did some changes that might fix the performance issue. Builds with revision 56823 or newer here will have the fix:
http://builder.blender.org/download/

I'm not sure what the cause of extra memory usage might be though, need more information about what you're seeing.%%%

%%%I fixed the distorted strokes now, and did some changes that might fix the performance issue. Builds with revision 56823 or newer here will have the fix: http://builder.blender.org/download/ I'm not sure what the cause of extra memory usage might be though, need more information about what you're seeing.%%%

Jiri Caslava commented

2013-05-15 21:50:28 +02:00

%%%Testing 56823 revision, distorted strokes and performance drop are fixed. Memory usage are still same.

I measure memory consumption in Blender header and in OS process manager. Values are after loading my test file and after painting 40 similar strokes in it.
official Blender 2.66a
before painting - Blender header:12.84M(4.14M) OS: 78,1M
after painting - Blender header: 14,42M (16,7M) OS: 92,3M

2.67
before painting - Blender header: 9.23M(4.14M) OS: 88,7M
after painting - Blender header: 213,5M (16,2M) OS: 426M

I also noticed, memory usage cohere with length of stroke. Very long stroke (2 minute riding of mouse on 1024x1024 image) take 1GB of RAM, while on 2.66 only 2-3MB.
Also this is probably somewhat related with undo history. When approx. same length strokes is painted, memory usage stop rising after same number of strokes as default undo steps - 32. However changing undo step or memory limit in preferences doesn't seem to affect this.
%%%

%%%Testing 56823 revision, distorted strokes and performance drop are fixed. Memory usage are still same. I measure memory consumption in Blender header and in OS process manager. Values are after loading my test file and after painting 40 similar strokes in it. official Blender 2.66a before painting - Blender header:12.84M(4.14M) OS: 78,1M after painting - Blender header: 14,42M (16,7M) OS: 92,3M 2.67 before painting - Blender header: 9.23M(4.14M) OS: 88,7M after painting - Blender header: 213,5M (16,2M) OS: 426M I also noticed, memory usage cohere with length of stroke. Very long stroke (2 minute riding of mouse on 1024x1024 image) take 1GB of RAM, while on 2.66 only 2-3MB. Also this is probably somewhat related with undo history. When approx. same length strokes is painted, memory usage stop rising after same number of strokes as default undo steps - 32. However changing undo step or memory limit in preferences doesn't seem to affect this. %%%

Brecht Van Lommel commented

2013-05-16 00:57:33 +02:00

%%%Found the reason for the memory usage now, again related to long strokes with small brush size. Memory usage will increase until the undo buffer is filled, but indeed this was too much.

Fix in svn now, thanks for the report and testing. Revision 56834 or newer will have the fix.%%%

%%%Found the reason for the memory usage now, again related to long strokes with small brush size. Memory usage will increase until the undo buffer is filled, but indeed this was too much. Fix in svn now, thanks for the report and testing. Revision 56834 or newer will have the fix.%%%

Brecht Van Lommel commented

2013-05-16 00:57:33 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2013-05-16 00:57:33 +02:00

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Distorted strokes while painting small brush in UV/Image + low performance #35372