Viewport shading mode "Material" can't render complex material & hang Blender 2.78rc2 for a while. #49381

New Issue

Lex · 2016-09-16T23:13:40+02:00

Lex commented

2016-09-16 23:13:40 +02:00

System Information
Windows 10 with GTX 1070 (driver version 372.70).

Blender Version
Broken in 2.78rc2 (see splash screen https://dl.dropboxusercontent.com/u/91696727/Blender_2.78_rc2.png )

Short description of error
When complex material assigned to mesh and I'm trying switch viewport shading mode to "Material" - Blender hangs for a minute and a half, than outputs pure black mesh; no matter what settings was set in material properties.

Exact steps for others to reproduce the error

Open attached scene.
Switch viewport shading mode to "Material".

RM Steel technical used.blend

**System Information** Windows 10 with GTX 1070 (driver version 372.70). **Blender Version** Broken in 2.78rc2 (see splash screen https://dl.dropboxusercontent.com/u/91696727/Blender_2.78_rc2.png ) **Short description of error** When complex material assigned to mesh and I'm trying switch viewport shading mode to "Material" - Blender hangs for a minute and a half, than outputs pure black mesh; no matter what settings was set in material properties. **Exact steps for others to reproduce the error** 1. Open attached scene. 2. Switch viewport shading mode to "Material". [RM Steel technical used.blend](https://archive.blender.org/developer/F361387/RM_Steel_technical_used.blend)

Lex commented

2016-09-16 23:13:40 +02:00

Changed status to: 'Open'

Lex commented

2016-09-16 23:13:40 +02:00

Added subscriber: @Lex4art

Ray molenkamp commented

2016-09-17 05:53:16 +02:00

Added subscriber: @LazyDodo

Ray molenkamp commented

2016-09-17 05:53:16 +02:00

the nvidia shader compiler is not having happy thoughts about this monster of a shader and calls it quits

Fragment info
-------------
Internal error: assembly compile error for fragment shader at offset 1617046:
-- error message --
line 65811, column 1:  error: too many instructions

the nvidia shader compiler is not having happy thoughts about this monster of a shader and calls it quits ``` Fragment info ------------- Internal error: assembly compile error for fragment shader at offset 1617046: -- error message -- line 65811, column 1: error: too many instructions ```

Lex commented

2016-09-17 10:17:16 +02:00

the nvidia shader compiler is not having happy thoughts about this monster of a shader and calls it quits

The strange thing about "Material" viewport rendering mode is that even with simplest material settings it's behave absolutley same (1.5 minute stall, than black mesh in viewport):
https://dl.dropboxusercontent.com/u/91696727/Blender_2.78_rc2_UV_density_checker_experiment.png
Seems that "Material" mode ignores "Mix shader" node Fac inputs like strict "1" or "0" (that's cut off rendering whole complicated brunches of nodes). In "Rendered" view port mode that cut-off works and no problems with rendering here...

P.S. Thanks for your spring blender build with pascal GPU support, saved my summer ).

>the nvidia shader compiler is not having happy thoughts about this monster of a shader and calls it quits The strange thing about "Material" viewport rendering mode is that even with simplest material settings it's behave absolutley same (1.5 minute stall, than black mesh in viewport): https://dl.dropboxusercontent.com/u/91696727/Blender_2.78_rc2_UV_density_checker_experiment.png Seems that "Material" mode ignores "Mix shader" node Fac inputs like strict "1" or "0" (that's [cut off rendering ](https://www.blender.org/manual/render/cycles/optimizations/nodes.html) whole complicated brunches of nodes). In "Rendered" view port mode that cut-off works and no problems with rendering here... P.S. Thanks for your spring blender build with pascal GPU support, saved my summer ).

Sergey Sharybin commented

2016-09-20 10:31:47 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2016-09-20 10:31:47 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2016-09-20 10:31:47 +02:00

Sergey Sharybin self-assigned this 2016-09-20 10:31:47 +02:00

Sergey Sharybin commented

2016-09-20 10:31:47 +02:00

GLSL code for this shader consists of 5708 lines of code, and that's not counting all the functions which are likely being inlined in there. It's a bit too much for GPU.

Perhaps improvements to the code generation, but this is something which belongs to the new viewport.

So thanks for the report, but considering it a TODO for now.

GLSL code for this shader consists of 5708 lines of code, and that's not counting all the functions which are likely being inlined in there. It's a bit too much for GPU. Perhaps improvements to the code generation, but this is something which belongs to the new viewport. So thanks for the report, but considering it a TODO for now.

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Viewport shading mode "Material" can't render complex material & hang Blender 2.78rc2 for a while. #49381