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Robert M (robertm)
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User Since
Feb 4 2013, 5:58 AM (328 w, 5 d)

Recent Activity

Jul 8 2018

Robert M (robertm) added a comment to T36594: Alpha channel of TGA, DDS, JPEG200, IRIS is not interpreted correctly.

I tested this on Linux with various file formats and libopenimageio 1.8.12 .

Jul 8 2018, 10:41 PM · Images & Movies, BF Blender

Mar 16 2018

Robert M (robertm) added a comment to T48819: Multiscatter GGX converges to different result (Path vs Branched Path).

I'm happy to say that with current builds (b0823962e9b) this issue is solved. Both methods converge now. The final picture is a bit different from both pictures I originally posted:


Mar 16 2018, 1:57 AM · BF Blender, Cycles

Jul 20 2017

Robert M (robertm) added a comment to T48819: Multiscatter GGX converges to different result (Path vs Branched Path).

I'm not sure if it is float precision issue, but one can see pretty quickly (after 4000 or 8000 samples) that it will converge to a different result.

Jul 20 2017, 5:52 PM · BF Blender, Cycles

Jul 14 2017

Robert M (robertm) added a comment to T48819: Multiscatter GGX converges to different result (Path vs Branched Path).

The issue still persists here with build 0f793ee. @Brecht Van Lommel (brecht) did you render my example .blend file before closing this issue?

Jul 14 2017, 5:32 PM · BF Blender, Cycles

Apr 6 2017

Robert M (robertm) created T51137: Blender freezes on Edge Split / Rip.
Apr 6 2017, 3:24 PM · BF Blender

Jul 9 2016

Robert M (robertm) created T48819: Multiscatter GGX converges to different result (Path vs Branched Path).
Jul 9 2016, 11:16 AM · BF Blender, Cycles

Jun 13 2016

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

The new if statement is working for me :)

Jun 13 2016, 5:27 PM · Cycles, BF Blender
Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

I made some progress:
After inserting some printfs in the block starting at line 464 I made these observations:

Jun 13 2016, 4:40 PM · Cycles, BF Blender

Jun 10 2016

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

After upgrading to gcc-5 and gcc-6 I was not able to produce correct renderings anymore (with the -flto trick I used in gcc-4.9)
So I looked at the code in intern/cycles/kernel/closure/bsdf_microfacet.h

Jun 10 2016, 10:47 AM · Cycles, BF Blender

May 19 2016

Robert M (robertm) added a comment to T47727: Weird bake results with non integer color values.

Sorry for the noise. I came to the conclusion that my understanding of correct and incorrect is wrong.

May 19 2016, 3:36 AM · BF Blender
Robert M (robertm) added a comment to T47727: Weird bake results with non integer color values.

Yes I compiled it myself, hash 89df672.
Hmm, thats strange: To produce correct indirect diffuse color, all RGB channels have to be non-zero.
If only one channel is non-zero then the result is always grey. (although there are different colored objects that should reflect their light onto the baked object)
Can someone confirm this?

May 19 2016, 3:22 AM · BF Blender
Robert M (robertm) added a comment to T47727: Weird bake results with non integer color values.

Seems that baking produces wrong results only for the RGB(1; 0; 0) diffuse color case.
The intermediate values are ok.

May 19 2016, 2:37 AM · BF Blender
Robert M (robertm) updated subscribers of T47727: Weird bake results with non integer color values.

I can reproduce it on Debian.
But the patch doesn't fix the problem.
Before the patch the direct light was buggy.
After the patch the indirect light is buggy.

May 19 2016, 1:58 AM · BF Blender

Mar 18 2016

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

@Sergey Sharybin (sergey), I just tested the gcc5.5 glibc 2.19 builds. There is no improvement unfortunately.

Mar 18 2016, 7:29 PM · Cycles, BF Blender

Mar 17 2016

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

Finally I'm able to build Blender myself.
The cause of this issue seems to be optimization done by gcc.

Mar 17 2016, 10:01 PM · Cycles, BF Blender

Feb 1 2016

Robert M (robertm) added a comment to T47263: problem with turntable orbit.

Why not make this an option? I used the old orbit behavior to quickly setup the camera for axonometric projection (useful for isometric games and tile rendering).
Now this is much more complicated.

Feb 1 2016, 9:10 PM · BF Blender

Jan 26 2016

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

I tested build b336124 on the same hardware (AMD Llano APU), but different OS:

Jan 26 2016, 2:19 PM · Cycles, BF Blender

Jan 20 2016

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

@Sergey Sharybin (sergey), I tried your suggestion with the Debug panel, tested every combination of SIMD flags, and without any SIMD flags, with and without QBVH, but unfortunately nothing has changed.
I can't test the OpenCL kernels because I have a pre GCN (graphics core next) APU, which is not supported by Blender.
A strange problem really, with no solution in sight. I'll try to test it on some other systems and report back.

Jan 20 2016, 10:06 PM · Cycles, BF Blender

Nov 28 2015

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

I still have this issue with the buildbot version on Debian. buid-date: 2015-11-27 hash: bafccb0

Nov 28 2015, 11:07 PM · Cycles, BF Blender

Nov 11 2015

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

@Sergey Sharybin (sergey) This happens in both, viewport and final render. Worked fine in 2.71
Here my system-info.txt:

Nov 11 2015, 5:13 AM · Cycles, BF Blender

Oct 19 2015

Robert M (robertm) added a comment to T46507: Regression on baking normals with Cycles - reversed normals?.

I can also confirm this bug. It seems that some but not all faces get rotated by 180 degrees during baking.
Here another example .blend:


Press "Bake". After baking connect the bake_texture output to the Diffuse BSDF.

Oct 19 2015, 1:41 AM · Cycles, BF Blender

Oct 18 2015

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

I experimented with clamping roughness to zero if it is less than 0.000173.
Seems to work well.
Not a real fix but a workaround.

Oct 18 2015, 12:26 AM · Cycles, BF Blender

Oct 15 2015

Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

Hmm..., maybe the issue is OS, or compile flag dependent.
I use the 64 bit Linux builds from buildbot.
@Carlo Bergonzini (Carlo) Andreacchio, @mohamed (mohamed) Sakr: what OS are you using?

Oct 15 2015, 4:57 PM · Cycles, BF Blender
Robert M (robertm) added a comment to T46492: GGX distribution produces black pixels.

Yes this still happens with latest git HEAD.
I use CPU renderer on AMD Richland APU.

Oct 15 2015, 10:37 AM · Cycles, BF Blender
Robert M (robertm) created T46492: GGX distribution produces black pixels.
Oct 15 2015, 4:54 AM · Cycles, BF Blender

Sep 27 2015

Robert M (robertm) added a comment to T46283: Regression: Scene Layer settings are not respected.

Thanks, for the explanation, Bastien.
I found a setting in the preferences called "Use 3D Viewport" (Screen->Render). I had to deactivate it for my purposes.
Still for quick preview renders we could have another shortcut like ALT+F12, because I think many artist are not aware of this feature.
Just my opinion.

Sep 27 2015, 7:44 PM · BF Blender: Regressions, BF Blender
Robert M (robertm) created T46284: Incorrect Texture shading in Texture paint mode.
Sep 27 2015, 8:05 AM · Sculpting and Painting, OpenGL / GPU, BF Blender
Robert M (robertm) created T46283: Regression: Scene Layer settings are not respected.
Sep 27 2015, 7:39 AM · BF Blender: Regressions, BF Blender

Aug 29 2015

Robert M (robertm) created T45946: Cycles texture interpolation bug.
Aug 29 2015, 8:01 AM · BF Blender: Next, BF Blender

Aug 13 2015

Robert M (robertm) added a comment to T45769: Image Texture Node Clipping Bug.

Press F12 to render it. (The viewport doesn't respect the new "Clip" option. It always has the "Repeat" mode. Maybe I should file a separate bug report for this?)
I'm using a second UV map called decal.
The sphere should mostly be covered by the sand texture. Only in the middle it should have the stone texture.

Aug 13 2015, 12:39 AM · Nodes, Cycles, BF Blender
Robert M (robertm) added a comment to T45769: Image Texture Node Clipping Bug.

Aug 13 2015, 12:24 AM · Nodes, Cycles, BF Blender

Aug 12 2015

Robert M (robertm) created T45769: Image Texture Node Clipping Bug.
Aug 12 2015, 2:38 PM · Nodes, Cycles, BF Blender

Sep 16 2014

Robert M (robertm) added a comment to T41185: Dithering is not applied for Texture Baking.

@Alexey (Inwader77) I think what you describe is dithering after rendering, which is functioning without flaws (Dithering is applied on the "Composite" Node).
What I mean here is dithering the texture after texture baking.

Sep 16 2014, 12:54 PM · Rendering, Cycles, BF Blender

Aug 23 2014

Robert M (robertm) added a comment to T36594: Alpha channel of TGA, DDS, JPEG200, IRIS is not interpreted correctly.

Thank you, Sergey! Waiting for the OIIO fixes.

Aug 23 2014, 1:49 PM · Images & Movies, BF Blender

Aug 8 2014

Robert M (robertm) added a comment to T41185: Dithering is not applied for Texture Baking.

@marc dion (marcclintdion)
Of course dithering should be an option. My last post could be misunderstood.
Right now dithering can't be applied on "Save Image", no matter what options you choose.

Aug 8 2014, 11:08 PM · Rendering, Cycles, BF Blender
Robert M (robertm) added a comment to T41185: Dithering is not applied for Texture Baking.

I think the solution for this problem is not a Cycles specific fix, but a general fix for the export routine for byte images.
So when you save a float image to a byte image, dithering should be applied (as is done when you render).

Aug 8 2014, 2:49 PM · Rendering, Cycles, BF Blender

Jul 25 2014

Robert M (robertm) added a comment to T41185: Dithering is not applied for Texture Baking.

Jul 25 2014, 11:32 PM · Rendering, Cycles, BF Blender
Robert M (robertm) created T41185: Dithering is not applied for Texture Baking.
Jul 25 2014, 11:28 PM · Rendering, Cycles, BF Blender

Jun 6 2014

Robert M (robertm) added a comment to T36594: Alpha channel of TGA, DDS, JPEG200, IRIS is not interpreted correctly.

@Sergey Sharybin (sergey):
Brecht already fixed TIFF and TGA.
Formats that are still affected are: DDS, JPEG2000, IRIS and DPX

Jun 6 2014, 3:11 AM · Images & Movies, BF Blender

Mar 5 2014

Robert M (robertm) attached 0 file(s) of 1: F80044: yin_yang.blend
Mar 5 2014, 11:40 PM · BF Blender, Animation
Robert M (robertm) raised the priority of T38976: Regression? new tessellation algorithm produces artefacts with flat, flipped-faces mesh. from to Needs Triage by Developer.
Mar 5 2014, 11:39 PM · BF Blender, Animation

Feb 24 2014

Robert M (robertm) raised the priority of T38809: Text cursor is off by 1 in "number buttons" from to Needs Triage by Developer.
Feb 24 2014, 3:07 PM · BF Blender, User Interface

Jan 18 2014

Robert M (robertm) added a comment to T38040: Crash after loading big image file in compositor.

Thank you for the fix, Sergey!

Jan 18 2014, 1:15 PM · Compositing, BF Blender

Jan 4 2014

Robert M (robertm) added a comment to T38040: Crash after loading big image file in compositor.

It seems that the "Image Drawing Method" in File/User Preferencies/System plays a significant role here.
GLSL is probably the most stable method (no crash so far), but it's slower than the other methods.
"DrawPixels" and "2D Texture" both cause this segfault.

Jan 4 2014, 11:16 PM · Compositing, BF Blender
Robert M (robertm) added a comment to T38040: Crash after loading big image file in compositor.

After a second thought it might be a bug.
Blender 2.69 consumes 26 percent of my 2GB with a 4000x4000 image.
So why should the current development version crash?

Jan 4 2014, 6:19 PM · Compositing, BF Blender
Robert M (robertm) added a comment to T38040: Crash after loading big image file in compositor.

Tested again, It's not a problem with the image loading, but with image viewing!
When I enable Backdrop or Show Viewer-Node in UV-Editor then Blender consumes very large amount of RAM.
Another thing I found out is, when I change the "Image Draw Method" to GLSL, RAM consumpion improves dramatically, and I can handle 8K Images on my 2 GB RAM system.
(though Draw Method: "2D Texture" seems to be a bit faster on my system)
But still the current version seems to consume more RAM than 2.69.
So it's not a real bug, but maybe improvements to RAM usage can be done some time in the future.

Jan 4 2014, 6:06 PM · Compositing, BF Blender
Robert M (robertm) attached 0 file(s) of 1: F61753: test_image8000.png
Jan 4 2014, 5:18 PM · Compositing, BF Blender
Robert M (robertm) added a comment to T38040: Crash after loading big image file in compositor.

I tested it again on another Linux computer with 8 GB RAM.
To achieve the same crash I needed to resize the image to 8000x8000.
Thomas could you please test it again with test_image8000.png?

Jan 4 2014, 5:17 PM · Compositing, BF Blender

Jan 3 2014

Robert M (robertm) added a comment to T38040: Crash after loading big image file in compositor.

I'm pretty sure I'm not running out of memory. (My swap partition would cause a significant slow down otherwise)
Instead, Blender crashes immediately, without touching the hard disc.
And 2.69 doesn't have any problems opening the test image.

Jan 3 2014, 6:28 PM · Compositing, BF Blender
Robert M (robertm) attached 0 file(s) of 1: F61086: test_image.png
Jan 3 2014, 5:07 PM · Compositing, BF Blender
Robert M (robertm) attached 0 file(s) of 1: F61085: open_big_image.crash.txt
Jan 3 2014, 4:58 PM · Compositing, BF Blender
Robert M (robertm) attached 0 file(s) of 1: F61084: open_big_image.blend
Jan 3 2014, 4:58 PM · Compositing, BF Blender
Robert M (robertm) raised the priority of T38040: Crash after loading big image file in compositor from to Needs Triage by Developer.
Jan 3 2014, 12:41 AM · Compositing, BF Blender