Timeline for Odd blending result (semi-transparent 2d quad over 3D scene)
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
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| Jul 9, 2013 at 12:05 | vote | accept | Basaa | ||
| Jul 9, 2013 at 12:05 | answer | added | elFarto | timeline score: 2 | |
| Jul 9, 2013 at 11:22 | comment | added | Basaa | What exactly do you mean with the setup code? gdse suggests me to continue in chat to prevent extended discussions in comments. | |
| Jul 9, 2013 at 11:19 | comment | added | Basaa | let us continue this discussion in chat | |
| Jul 9, 2013 at 11:18 | comment | added | elFarto | Ok, if you don't have a fragment shader bound, and turning off blending shows it correctly, then you have something else in your state that is messing with the alpha value, since that image could not have been produced if the alpha value was 1. I think you might need to post the setup code to rendering the quad. | |
| Jul 9, 2013 at 11:14 | comment | added | Basaa | Yes, then it will render fine, but I need blending. | |
| Jul 9, 2013 at 9:38 | comment | added | elFarto | If you disable blending, does the quad render the correct colour? | |
| Jul 9, 2013 at 8:00 | comment | added | Basaa | Nope. No shaders. Only for the 3D scene. | |
| Jul 9, 2013 at 7:07 | comment | added | elFarto | Do you have any fragment shader bound when rendering the quad? | |
| Jul 9, 2013 at 6:18 | comment | added | Basaa | Many thanks, but there is no 0.2 or 0.8 in my project. It looks like my entire blending is f*cked up, as if I try to draw another rectangle on top of the blue one, it shows black no matter what color I assign to it. I'm completely lost. | |
| Jul 9, 2013 at 3:04 | comment | added | Kevin Reid |
FYI, I did a little calculation based on the color values in your screenshot, and the colors inside the rectangle vs. outside are pretty close to 0.2 * vec3(0, 0, 1) + 0.8 * outsideColor — that is, like an RGBA color of 0, 0, 1, 0.2. Assuming your screenshot has no color/gamma correction, anyway (which is likely since the colors line up neatly). I suggest looking around your code for where you have the number 0.2 or 0.8, to see where that might have arisen.
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| Jul 8, 2013 at 21:07 | history | edited | Basaa | CC BY-SA 3.0 |
deleted 1 characters in body
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| Jul 8, 2013 at 20:57 | history | edited | Basaa | CC BY-SA 3.0 |
added 294 characters in body
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| Jul 8, 2013 at 20:56 | comment | added | Basaa | Yes I bean glBegin, sorry. Added the quad code. | |
| Jul 8, 2013 at 20:24 | comment | added | elFarto | Firstly, did you mean glBegin(GL_QUADS) rather than glEnable(GL_QUADS) (which is invalid). Secondly, can you paste the code that draws the quad? | |
| Jul 8, 2013 at 6:01 | comment | added | Basaa | Added your suggestions. | |
| Jul 8, 2013 at 6:01 | history | edited | Basaa | CC BY-SA 3.0 |
Added screenshot and fragment shader source
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| Jul 7, 2013 at 22:50 | comment | added | Kevin Reid | Nothing is obviously wrong with what you've shown. I suggest providing more information: • A screenshot of the problem • Your fragment shader code | |
| Jul 7, 2013 at 19:51 | history | asked | Basaa | CC BY-SA 3.0 |