3D_POLYLINE_UNIFORM_COLOR shader not displaying #87118

New Issue

Mikhail Rachinskiy · 2021-04-01T14:30:30+02:00

2021-04-01 14:30:30 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 860M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-31 19:43, hash: 1a100d2d78
Worked: 2.92 Release

Short description of error
3D_POLYLINE_UNIFORM_COLOR shader does not show in viewport.

Exact steps for others to reproduce the error

Open attached blend file.
Run script from Text Editor – there should be no change in viewport.
Comment out 3D_POLYLINE_UNIFORM_COLOR shader assignment line, and uncomment 3D_UNIFORM_COLOR.
Run script again – now there should be two yellow lines in viewport.

polyline.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 860M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-31 19:43, hash: `1a100d2d78` Worked: 2.92 Release **Short description of error** `3D_POLYLINE_UNIFORM_COLOR` shader does not show in viewport. **Exact steps for others to reproduce the error** - Open attached blend file. - Run script from Text Editor – there should be no change in viewport. - Comment out `3D_POLYLINE_UNIFORM_COLOR` shader assignment line, and uncomment `3D_UNIFORM_COLOR`. - Run script again – now there should be two yellow lines in viewport. [polyline.blend](https://archive.blender.org/developer/F9916875/polyline.blend)

Mikhail Rachinskiy commented

2021-04-01 14:30:30 +02:00

Added subscriber: @MikhailRachinskiy

Harley Acheson commented

2021-04-01 18:32:55 +02:00

Added subscriber: @Harley

Harley Acheson commented

2021-04-01 18:32:55 +02:00

Pretty sure that 3D_POLYLINE_UNIFORM_COLOR requires you to set "lineWidth", and probably also "viewportSize"

Germano Cavalcante commented

2021-04-01 19:02:00 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-04-01 19:02:00 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Germano Cavalcante closed this issue

2021-04-01 19:02:00 +02:00

Germano Cavalcante commented

2021-04-01 19:02:00 +02:00

In #87118#1139811, @Harley wrote:
Pretty sure that 3D_POLYLINE_UNIFORM_COLOR requires you to set "lineWidth", and probably also "viewportSize"

Well noticed @Harley!
In fact, the example code does not configure these uniforms.
The documentation can be improved however.
You can read the shader code to be sure of what it requires.

print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['vertex_shader'])
print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['geometry_shader'])
print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['fragment_shader'])

Closing since it is not about a bug.

> In #87118#1139811, @Harley wrote: > Pretty sure that 3D_POLYLINE_UNIFORM_COLOR requires you to set "lineWidth", and probably also "viewportSize" Well noticed @Harley! In fact, the example code does not configure these uniforms. The documentation can be improved however. You can read the shader code to be sure of what it requires. ``` print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['vertex_shader']) print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['geometry_shader']) print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['fragment_shader']) ``` Closing since it is not about a bug.

John commented

2023-01-11 10:27:35 +01:00

Added subscriber: @Solstice245

John commented

2023-01-11 10:27:35 +01:00

In #87118#1139823, @mano-wii wrote:

In #87118#1139811, @Harley wrote:
Pretty sure that 3D_POLYLINE_UNIFORM_COLOR requires you to set "lineWidth", and probably also "viewportSize"

Well noticed @Harley!
In fact, the example code does not configure these uniforms.
The documentation can be improved however.
You can read the shader code to be sure of what it requires.
print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['vertex_shader'])
print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['geometry_shader'])
print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['fragment_shader'])
Closing since it is not about a bug.

Would someone mind sharing how to perform this action in the latest version? When I attempted to execute those prints in my 3.4 Blender I got an error saying "gpu.shader has no attribute 'code_from_builtin'".
Also here to second that improved documentation or perhaps a short tutorial on this specific shader would be appreciated as I am unable figure out how to output anything with the shader given the sparse information available. (And yes, I did try various values for the lineWidth and viewportSize uniforms...)

EDIT: Naturally, right after making this post I figured out at least how to get render ouput, lol

> In #87118#1139823, @mano-wii wrote: >> In #87118#1139811, @Harley wrote: >> Pretty sure that 3D_POLYLINE_UNIFORM_COLOR requires you to set "lineWidth", and probably also "viewportSize" > Well noticed @Harley! > In fact, the example code does not configure these uniforms. > The documentation can be improved however. > You can read the shader code to be sure of what it requires. > ``` > print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['vertex_shader']) > print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['geometry_shader']) > print(gpu.shader.code_from_builtin('3D_POLYLINE_UNIFORM_COLOR')['fragment_shader']) > ``` > Closing since it is not about a bug. Would someone mind sharing how to perform this action in the latest version? When I attempted to execute those prints in my 3.4 Blender I got an error saying "gpu.shader has no attribute 'code_from_builtin'". Also here to second that improved documentation or perhaps a short tutorial on this specific shader would be appreciated as I am unable figure out how to output anything with the shader given the sparse information available. (And yes, I did try various values for the lineWidth and viewportSize uniforms...) EDIT: Naturally, right after making this post I figured out at least how to get render ouput, lol

John commented

2023-01-11 10:43:41 +01:00

And now that I've got something out of it, I'm more confused about how it works than ever...
The lines seemingly invariably go across the entire screen, rather than starting and ending at the given coordinates.
So again, improved documentation or a tutorial would be appreciated. ;D

And now that I've got something out of it, I'm more confused about how it works than ever... The lines seemingly invariably go across the entire screen, rather than starting and ending at the given coordinates. So again, improved documentation or a tutorial would be appreciated. ;D

Philipp Oeser commented

2023-01-11 10:45:31 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2023-01-11 10:45:31 +01:00

Same as blender/documentation#103176 (Regression: 3D shader 3D_POLYLINE_UNIFORM_COLOR draw error (the need to set all shader uniforms need to be documented)) btw.

Philipp Oeser commented

2023-01-11 10:45:39 +01:00

Closed as duplicate of blender/documentation#103176

Philipp Oeser closed this issue

2023-01-11 10:45:39 +01:00

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3D_POLYLINE_UNIFORM_COLOR shader not displaying #87118