Inconsistencies between 3D Viewport and Viewport Render Image using the GPU Shader Module #77958

New Issue

Sebastian · 2020-06-17T16:54:09+02:00

Sebastian commented

2020-06-17 16:54:09 +02:00

System Information
Operating system: Ubuntu 18.04, Windows 10
Graphics card: GeForce GTX Titan X, GeForce GTX 1080 Ti

Blender Version
Broken:
2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: 211b6c29f7
2.90.0 Alpha, branch: master, commit date: 2020-06-16 18:15, hash: c7b03fe9c0
Worked: Never

Short description of error
Rendering the 3D Viewport with 3D Viewport/View/View Render Image (i.e. OpenGL rendering) does not render elements drawn with the GPU Shader module .

The problem is illustrated in the following example, which shows the 3D Viewport (left) and the rendered result of View/View Render Image (right).
The points drawn with the GPU shader module are neglected during OpenGL rendering.

Exact steps for others to reproduce the error
Excecute the [3D Lines with Single Color ]] example of the [ https:*docs.blender.org/api/current/gpu.html | GPU shader module documentation .
Then, render the results withView/View Render Image as shown in the image below.

The lines visible in the 3D Viewport (left) are missing in the rendered result (right).

**System Information** Operating system: Ubuntu 18.04, Windows 10 Graphics card: GeForce GTX Titan X, GeForce GTX 1080 Ti **Blender Version** Broken: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: `211b6c29f7` 2.90.0 Alpha, branch: master, commit date: 2020-06-16 18:15, hash: `c7b03fe9c0` Worked: Never **Short description of error** Rendering the `3D Viewport` with `3D Viewport/View/View Render Image` (i.e. OpenGL rendering) does not render elements drawn with the [GPU Shader module ](https://docs.blender.org/api/current/gpu.html). The problem is illustrated in the following example, which shows the `3D Viewport` (left) and the rendered result of `View/View Render Image` (right). The points drawn with the GPU shader module are neglected during OpenGL rendering. ![combined_points.jpg](https://archive.blender.org/developer/F8627982/combined_points.jpg) **Exact steps for others to reproduce the error** Excecute the [3D Lines with Single Color ]] example of the [[ https:*docs.blender.org/api/current/gpu.html | GPU shader module documentation ](https:*docs.blender.org/api/current/gpu.html#d-lines-with-single-color). Then, render the results with`View/View Render Image` as shown in the image below. ![viewport_render_image.jpg](https://archive.blender.org/developer/F8628029/viewport_render_image.jpg) The lines visible in the 3D Viewport (left) are missing in the rendered result (right). ![combined_lines.jpg](https://archive.blender.org/developer/F8627977/combined_lines.jpg)

Sebastian commented

2020-06-17 16:54:09 +02:00

Added subscriber: @sbcv

Germano Cavalcante commented

2020-06-18 19:24:33 +02:00

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

Germano Cavalcante commented

2020-06-18 19:24:33 +02:00

Added subscriber: @mano-wii

Clément Foucault commented

2020-07-01 17:00:34 +02:00

Added subscribers: @ideasman42, @fclem

Clément Foucault commented

2020-07-01 17:00:34 +02:00

This is because the callbacks needs a context which is NULL when using the viewport render (DST.draw_ctx.evil_C). And the viewport render cannot have a full context available that is needed to render all possible callbacks.

@ideasman42 Correct me if I'm wrong.

This is because the callbacks needs a context which is NULL when using the viewport render (`DST.draw_ctx.evil_C`). And the viewport render cannot have a full context available that is needed to render all possible callbacks. @ideasman42 Correct me if I'm wrong.

Sebastian commented

2020-07-01 17:44:08 +02:00

In case this is not going to be fixed, is there currently any possibility to perform a joint rendering of elements of the GPU module and the 3D Viewport (with correct occlusion), which can be written to disk?

I tried the following approaches without success:
1.) GPU Offscreen rendering + OpenGL rendering:
Could not read the depth buffer of the OpenGL rendering => no correct occlusions
2.) GPU Offscreen rendering + Rendering the 3D View into a Texture
Could not read the depth buffer of the 3D View rendering => no correct occlusions
3.) Renderengine
The Renderengine did not draw cameras etc.

Am I missing something here, or is it just not possible?
Side note: Making a screenshot of the 3D view is not an option, since I want to use Blender's animation capabilities to render the scenes from multiple view points.

In case this is not going to be fixed, is there currently any possibility to perform a joint rendering of elements of the GPU module and the 3D Viewport (with correct occlusion), which can be written to disk? I tried the following approaches without success: 1.) GPU Offscreen rendering + OpenGL rendering: Could not read the depth buffer of the OpenGL rendering => no correct occlusions 2.) GPU Offscreen rendering + [Rendering the 3D View into a Texture](https://docs.blender.org/api/current/gpu.html#rendering-the-3d-view-into-a-texture) Could not read the depth buffer of the 3D View rendering => no correct occlusions 3.) [Renderengine ](https://docs.blender.org/api/current/bpy.types.RenderEngine.html) The Renderengine did not draw cameras etc. Am I missing something here, or is it just not possible? Side note: Making a screenshot of the 3D view is not an option, since I want to use Blender's animation capabilities to render the scenes from multiple view points.

Chris Kohl commented

2020-07-12 01:50:16 +02:00

Added subscriber: @ckohl_art

hujin commented

2021-03-14 05:32:31 +01:00

Added subscriber: @2046411367

Philipp Oeser removed the

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Inconsistencies between 3D Viewport and Viewport Render Image using the GPU Shader Module #77958