GLSL transparency visible without Object Properties -> Display -> [ ] Transparency selected. #41731

New Issue

Jaggz H · 2014-09-06T12:28:13+02:00

Jaggz H commented

2014-09-06 12:28:13 +02:00

System Information
W7x64,

Blender Version
Broken:

 W7x64, 2.71 with GeForce GT 240 and an AMD Phenom II X4 840T processor.
 W7x64, 2.71.6 (24ea3ab) with gtx 570 and an i7 2600k

An object appears transparent even without Object -> Display -> Transparency selected.
Two situations:

When the transparent object (Obj A) is selected, it is transparent, and other objects (Obj B) show through it, like normal transparency.
When another object is selected (ex: an intersecting cube), Obj A is still transparent, but only its own faces show through.

Exact steps for others to reproduce the error

New .blend.
Switch to GLSL (N panel -> Shading -> GLSL)
Switch to Texture display mode.
Make two cubes (eg. duplicate default cube).
Make cubes intersect or otherwise visually overlap (not fully necessary to see some of the issue).
Choose a cube and enable Materials -> Transparency, and set Alpha to, say, .5.
6a. You can optionally single-user the Material and set transparency on just one cube.
You should see the cube is transparent.
Choosing the other cube (possibly the opaque one) changes how the transparency is displayed.
glsl-bug-from-scratch.blend

Several people say it's a bug that the object(s) are transparent without Object -> Display -> Transparency being selected, so please let us know if this is a feature. :)

**System Information** W7x64, **Blender Version** Broken: ``` W7x64, 2.71 with GeForce GT 240 and an AMD Phenom II X4 840T processor. W7x64, 2.71.6 (24ea3ab) with gtx 570 and an i7 2600k ``` An object appears transparent even without Object -> Display -> Transparency selected. Two situations: 1. When the transparent object (Obj A) is selected, it is transparent, and other objects (Obj B) show through it, like normal transparency. 2. When another object is selected (ex: an intersecting cube), Obj A is still transparent, but only its own faces show through. **Exact steps for others to reproduce the error** 1. New .blend. 2. Switch to GLSL (N panel -> Shading -> GLSL) 3. Switch to Texture display mode. 4. Make two cubes (eg. duplicate default cube). 5. Make cubes intersect or otherwise visually overlap (not fully necessary to see some of the issue). 6. Choose a cube and enable Materials -> Transparency, and set Alpha to, say, .5. 6a. You can optionally single-user the Material and set transparency on just one cube. 7. You should see the cube is transparent. 8. Choosing the other cube (possibly the opaque one) changes how the transparency is displayed. [glsl-bug-from-scratch.blend](https://archive.blender.org/developer/F109155/glsl-bug-from-scratch.blend) Several people say it's a bug that the object(s) are transparent without Object -> Display -> Transparency being selected, so please let us know if this is a feature. :)

Jaggz H commented

2014-09-06 12:28:13 +02:00

Changed status to: 'Open'

Jaggz H commented

2014-09-06 12:28:13 +02:00

Added subscriber: @jaggz

Bastien Montagne commented

2014-09-06 14:40:24 +02:00

Added subscribers: @Sergey, @Psy-Fi, @mont29

Bastien Montagne commented

2014-09-06 14:40:24 +02:00

Iirc, this is considered a feature… OGL guys might know, sergey, psy-fi?

Sergey Sharybin commented

2014-09-08 11:07:06 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2014-09-08 11:07:06 +02:00

Sergey Sharybin self-assigned this 2014-09-08 11:07:06 +02:00

Sergey Sharybin commented

2014-09-08 11:07:06 +02:00

This is just the way how transparency handled in the viewport, caused by the order of the objects being displayed. In order to make such cases work correct we'll need to sort faces by the Z-buffer and draw them in that order. That'd lead to really loads of overhead, making display really slow.

Thanks for the report, but it's just a known limitation.

This is just the way how transparency handled in the viewport, caused by the order of the objects being displayed. In order to make such cases work correct we'll need to sort faces by the Z-buffer and draw them in that order. That'd lead to really loads of overhead, making display really slow. Thanks for the report, but it's just a known limitation.

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GLSL transparency visible without Object Properties -> Display -> [ ] Transparency selected. #41731