Very slow subsurface with material mode in viewport and before rendering. #49499

New Issue

Vyacheslav Kobozev · 2016-09-30T15:32:06+02:00

2016-09-30 15:32:06 +02:00

System Information
Win7 x64
nVidia 640GT
Xeon E5450 3Ghz

Blender Version
Broken: 2.78 (rc2 or release)
Worked: 2.77a

Short description of error
Subsurf is very slow with 2 and 3 steps when I am in material mode in the viewport.
Object is simple but multimaterial.
Subsurf is fast in the solid mode, but if I making subsurf in solid and switch back to material view, I have long delay.
Also long delay between sculpt and object mode. Long delay with Undo, deleting vertex group from object etc.
The same is without UV-subdividing. The same with switching UV-subdivide option.
The same with duplicating this object. The same with opening file.

Here is the object
slowsubsurf.7z

**System Information** Win7 x64 nVidia 640GT Xeon E5450 3Ghz **Blender Version** Broken: 2.78 (rc2 or release) Worked: 2.77a **Short description of error** Subsurf is very slow with 2 and 3 steps when I am in material mode in the viewport. Object is simple but multimaterial. Subsurf is fast in the solid mode, but if I making subsurf in solid and switch back to material view, I have long delay. Also long delay between sculpt and object mode. Long delay with Undo, deleting vertex group from object etc. The same is without UV-subdividing. The same with switching UV-subdivide option. The same with duplicating this object. The same with opening file. Here is the object [slowsubsurf.7z](https://archive.blender.org/developer/F371450/slowsubsurf.7z)

Vyacheslav Kobozev commented

2016-09-30 15:32:06 +02:00

Changed status to: 'Open'

Vyacheslav Kobozev commented

2016-09-30 15:32:06 +02:00

Added subscriber: @Vyach

Sergey Sharybin commented

2016-10-06 15:24:37 +02:00

Added subscribers: @AlexanderRomanov, @Sergey

Alexander Romanov was assigned by Sergey Sharybin

2016-10-06 15:24:37 +02:00

Sergey Sharybin commented

2016-10-06 15:24:37 +02:00

Talked briefly to @AlexanderRomanov in IRC, he offered his help helping here :)

Alexander Romanov commented

2016-10-06 18:29:13 +02:00

I confirm the performance regression caused by 5abae51 and 5494ea1 . Will investigate it tomorrow.

I confirm the performance regression caused by 5abae51 and 5494ea1 . Will investigate it tomorrow.

Alexander Romanov commented

2016-10-07 11:27:53 +02:00

Bad performance caused by tangent calculation needed for Normal Mapping. The "Normal Map" node had not been working at all till these two patches were commited. I have similar performance as before the patches if I mute the "Normal Map" in material shader.
I see slow performance for non-node material with normal mapping and similar mesh complexity before these patches.

Bad performance caused by tangent calculation needed for Normal Mapping. The "Normal Map" node had not been working at all till these two patches were commited. I have similar performance as before the patches if I mute the "Normal Map" in material shader. I see slow performance for non-node material with normal mapping and similar mesh complexity before these patches.

Vyacheslav Kobozev commented

2016-10-08 13:07:47 +02:00

Alexander, thanks for details.
So it is another one reason to keep strict workflow from modeling to texturing

Alexander, thanks for details. So it is another one reason to keep strict workflow from modeling to texturing

Brecht Van Lommel commented

2016-10-08 14:12:37 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2016-10-08 14:12:37 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2016-10-08 14:12:37 +02:00

Brecht Van Lommel commented

2016-10-08 14:12:37 +02:00

This should be fixed by 5a0f397eaa, latest builds from https://builder.blender.org/download/ should have faster normal map computation again (though obviously not as fast as no computation at all).

This should be fixed by 5a0f397eaa, latest builds from https://builder.blender.org/download/ should have faster normal map computation again (though obviously not as fast as no computation at all).

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Very slow subsurface with material mode in viewport and before rendering. #49499