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David M (erwin94)
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User Since
Jan 17 2010, 3:58 AM (508 w, 3 d)

Recent Activity

Sep 30 2016

David M (erwin94) created T49501: Animations imported via alembic render with wrong or no motion blur.
Sep 30 2016, 5:27 PM · BF Blender

Feb 20 2016

David M (erwin94) created T47504: Crash when switching OSL script.
Feb 20 2016, 3:10 PM · BF Blender

Sep 6 2015

David M (erwin94) updated the diff for D1494: possible optimization for ffmpeg decoding (reuse last_frame)?.

Alright, updated diff, hopefully threadsafe check for refcounter added.
I added a generic check function to the ImBuf interface, since the spinlock
is static in that module, and this could be useful elsewhere. Also the correct
value to check seems to be refcounter==0 instead of refcounter <=1?
At least IMB_makeSingleUser() does that, but it also does that without
the lock?

Sep 6 2015, 2:02 AM · BF Blender

Aug 31 2015

David M (erwin94) updated the diff for D1494: possible optimization for ffmpeg decoding (reuse last_frame)?.

Okay, so this checks the refcount now, but looking at
the values it seems a little unpredictable when the refcount
will actually be <= 1... whether the clip was loaded in the
sequencer or the movie clip editor seems to make a difference?
Anyways, this shouldn't hurt now, but these allocations seem to
be the thing that hurts performance the most during "normal"
playback, without effects, scaling or other compositing. Maybe
this could use some more refactoring to use a small pool of
already allocated frames?

Aug 31 2015, 4:14 AM · BF Blender
Aaron Carlisle (Blendify) awarded T45960: possible optimization for ffmpeg decoding (reuse last_frame)? a Mountain of Wealth token.
Aug 31 2015, 3:03 AM · BF Blender
David M (erwin94) created T45960: possible optimization for ffmpeg decoding (reuse last_frame)?.
Aug 31 2015, 1:12 AM · BF Blender
David M (erwin94) retitled D1494: possible optimization for ffmpeg decoding (reuse last_frame)? from to possible optimization for ffmpeg decoding (reuse last_frame)?.
Aug 31 2015, 12:53 AM · BF Blender

Aug 21 2015

David M (erwin94) added a comment to T45809: Motion blur problems with Follow Track constraints.

Interesting, this is what I get on 2.75a, on Windows7 64bit and OSX 10.9 64bit:

Aug 21 2015, 10:37 AM · Motion Tracking, Cycles, BF Blender

Aug 16 2015

David M (erwin94) added a comment to T45811: Normalize/anti-aliasing bug.

The default antialiasing filter (Mitchell-Netravali) has negative lobes, meaning it produces sharpened edges.
While these edges look sharper, it can create pixel values outside the range of the original image.

Aug 16 2015, 9:33 AM · Compositing, Rendering, BF Blender

Aug 15 2015

David M (erwin94) added a comment to T45809: Motion blur problems with Follow Track constraints.

As the sample file demonstrates, a workaround is to bake the animation into keyframes, removing the constraint.

Aug 15 2015, 6:18 PM · Motion Tracking, Cycles, BF Blender
David M (erwin94) added a comment to T45809: Motion blur problems with Follow Track constraints.

Sample file:

Aug 15 2015, 6:15 PM · Motion Tracking, Cycles, BF Blender
David M (erwin94) created T45809: Motion blur problems with Follow Track constraints.
Aug 15 2015, 6:13 PM · Motion Tracking, Cycles, BF Blender

Aug 18 2014

David M (erwin94) added a comment to T41473: Cycles volume rendering is too dark.

Ah, okay. If fixing this is difficult I'm fine with closing this bug.
For any somewhat complex volumetric rendering scene I expect that value
has been touched, and I only found this in a simple test scene.

Aug 18 2014, 11:32 PM · Cycles, BF Blender
David M (erwin94) added a comment to T41473: Cycles volume rendering is too dark.

Okay, I was a little bit too quick with reporting this...

Aug 18 2014, 12:40 PM · Cycles, BF Blender
David M (erwin94) added a comment to T41473: Cycles volume rendering is too dark.

Attached file:

Aug 18 2014, 12:34 PM · Cycles, BF Blender
David M (erwin94) created T41473: Cycles volume rendering is too dark.
Aug 18 2014, 12:33 PM · Cycles, BF Blender

Jul 9 2014

David M (erwin94) attached 0 file(s) of 1: F97193: box.blend
Jul 9 2014, 5:52 PM · BF Blender, Platform: Windows, Cycles
David M (erwin94) raised the priority of T41005: Seemingly random crashes with cycles rendering from to Needs Triage by Developer.
Jul 9 2014, 5:52 PM · BF Blender, Platform: Windows, Cycles

Jan 23 2014

David M (erwin94) attached 0 file(s) of 1: F73668: bevel_test.blend

This is reproducible with a couple of constructive modifiers, it seems like a bevel problem.
(Note that the problem disappears in all cases if the first modifier is applied)

Jan 23 2014, 11:15 AM · Modifiers, BF Blender