Open gl render objects transparent #47218

New Issue

Andrew · 2016-01-21T10:37:25+01:00

Andrew commented

2016-01-21 10:37:25 +01:00

System Information
Win 7 GTX 750ti

Broken: 2.76.5

Open gl renderer put alpha on the objects, which resulting them to appear transparent when rendering playblasts in textured shaded mode. This kinda works with static images, and the animated playblasts works fine with solid and shadeless modes.

Exact steps for others to reproduce the error
With a textured character turn on viewport shading to texture, and make sure shadeless is unchecked and you render animated playblast. Also viewport background appear transparent too. World background texture works fine. The engine should be cycles.

static solid
animated textured shaded.avi

**System Information** Win 7 GTX 750ti Broken: 2.76.5 Open gl renderer put alpha on the objects, which resulting them to appear transparent when rendering playblasts in textured shaded mode. This kinda works with static images, and the animated playblasts works fine with solid and shadeless modes. **Exact steps for others to reproduce the error** With a textured character turn on viewport shading to texture, and make sure shadeless is unchecked and you render animated playblast. Also viewport background appear transparent too. World background texture works fine. The engine should be cycles. static solid ![static solid.jpg](https://archive.blender.org/developer/F275829/static_solid.jpg) [animated textured shaded.avi](https://archive.blender.org/developer/F275831/animated_textured_shaded.avi)

Andrew commented

2016-01-21 10:37:25 +01:00

Changed status to: 'Open'

Andrew commented

2016-01-21 10:37:25 +01:00

Added subscriber: @AndrewShi

Bastien Montagne commented

2016-01-22 15:52:00 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2016-01-22 15:52:00 +01:00

Please follow our submission template and guidelines and make a complete, valid bug report, with required info, precise description of the issue, precise steps to reproduce it, small and simple .blend and/or other files to do so if needed, etc.

Please follow our submission template and guidelines and make a complete, valid bug report, with required info, precise description of the issue, precise steps to reproduce it, **small and simple** .blend and/or other files to do so if needed, etc.

Andrew commented

2016-01-23 18:23:05 +01:00

I already described this pretty much precise...Okay second attempt.

Open file with textured model, push alt+z - you now should see the textured model on the screen. Then OpenGl render active viewport. It small camera icon on the bottom panel of your 3d view. Now you on UV IMAGE editor window and should see rendered image. And due the bug - objects here are transparent.
If you check shadeless in the SHADE menu of the N-panel and render again - you should see the objects on the render result.

Again:
TEXTURE SHADED VIEW is bugged - transparent objects on the render

TEXTURE SHADED with SHADELESS checked - no transparent, works fine (except background is still transparent)

Solid shaded - works

Material shaded - don't work

When i render the playblasts with my textured characters from active viewport, i expect too see them on the render. This bug cuts' them off if i turn on textured shaded view.

In your UV IMAGE EDITOR you have three checkered icons near "combined". Channels of the image to draw.
COLOR AND ALPHA
COLOR
ALPHA

Check the Alpha channel any time you render.
Cube.blend
this file contains the cube with a uv grid texture on it. The texture should be packed there. If not - create your own and put it on the cube.

I already described this pretty much precise...Okay second attempt. Open file with textured model, push alt+z - you now should see the textured model on the screen. Then OpenGl render active viewport. It small camera icon on the bottom panel of your 3d view. Now you on UV IMAGE editor window and should see rendered image. And due the bug - objects here are transparent. If you check shadeless in the SHADE menu of the N-panel and render again - you should see the objects on the render result. Again: TEXTURE SHADED VIEW is bugged - transparent objects on the render TEXTURE SHADED with SHADELESS checked - no transparent, works fine (except background is still transparent) Solid shaded - works Material shaded - don't work When i render the playblasts with my textured characters from active viewport, i expect too see them on the render. This bug cuts' them off if i turn on textured shaded view. In your UV IMAGE EDITOR you have three checkered icons near "combined". Channels of the image to draw. COLOR AND ALPHA COLOR ALPHA Check the Alpha channel any time you render. [Cube.blend](https://archive.blender.org/developer/F276938/Cube.blend) this file contains the cube with a uv grid texture on it. The texture should be packed there. If not - create your own and put it on the cube.

Ralf Hölzemer commented

2016-01-24 18:19:04 +01:00

Added subscriber: @cheleb

Ralf Hölzemer commented

2016-01-24 18:19:04 +01:00

Confirmed on Linux

Broken in: 147f7a1e86
Last working: 82191b102f

Exact steps for others to reproduce the error:

open Andrew's attached Cube.blend
set the Render Engine to Cycles and the 3dView drawmode to Textured
do an OpenGL render by pressing the Camera icon in the 3dView's Header

The Render Result is completely transparent, but you can see the RGB values of the Cube by LMB clicking on the image.

Now:

open the properties panel in the 3dView and activate Shadless under the Shading Tab
do an OpenGL render by pressing the Camera icon in the 3dView's Header

This time, the Cube can be seen in the Render Result

The reason seems to be that the new Simple Shader is initialized with an alpha value of zero in drawmesh.c [here ]] and [ https:*developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_view3d/drawmesh.c;147f7a1e860587a928f465b0b4d0ecf816c997be$387 | here .

Attached patch fixes this for me, but I am not sure if this is the right solution.
fix_t47218_initialize_basic_shader_with_full_alpha.diff

Cheers,
Ralf

Confirmed on Linux Broken in: 147f7a1e86 Last working: 82191b102f **Exact steps for others to reproduce the error:** - open Andrew's attached [Cube.blend ](https://developer.blender.org/F276938) - set the Render Engine to Cycles and the 3dView drawmode to Textured - do an OpenGL render by pressing the Camera icon in the 3dView's Header The Render Result is completely transparent, but you can see the RGB values of the Cube by LMB clicking on the image. ![missing_alpha.jpg](https://archive.blender.org/developer/F277062/missing_alpha.jpg) **Now:** - open the properties panel in the 3dView and activate Shadless under the Shading Tab - do an OpenGL render by pressing the Camera icon in the 3dView's Header This time, the Cube can be seen in the Render Result ![correct_alpha.jpg](https://archive.blender.org/developer/F277064/correct_alpha.jpg) The reason seems to be that the new Simple Shader is initialized with an alpha value of zero in drawmesh.c [here ]] and [[ https:*developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_view3d/drawmesh.c;147f7a1e860587a928f465b0b4d0ecf816c997be$387 | here ](https:*developer.blender.org/diffusion/B/browse/master/source/blender/editors/space_view3d/drawmesh.c;147f7a1e860587a928f465b0b4d0ecf816c997be$1080). Attached patch fixes this for me, but I am not sure if this is the right solution. [fix_t47218_initialize_basic_shader_with_full_alpha.diff](https://archive.blender.org/developer/F277066/fix_t47218_initialize_basic_shader_with_full_alpha.diff) Cheers, Ralf

Campbell Barton was assigned by Bastien Montagne

2016-01-25 08:07:41 +01:00

Bastien Montagne commented

2016-01-25 08:07:41 +01:00

Added subscribers: @MikeErwin, @Sergey, @ideasman42