texture2D in custom 2D filters can get texture outside of game, resulting in ugliness #23375

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Jacob F · 2010-08-18T20:08:54+02:00

Jacob F commented

2010-08-18 20:08:54 +02:00

Category: Rendering

%%%As an example here is an attached .blend containing a simple star 2d filter.
Everything looks great -- but what are those ugly artifacts around the edge? Well it's obviously the controls from outside of the game window being pulled in. Probably it should be black out of the game window - or better - extended, but I don't know how it works. I don't want to check if the pixel it's computing with is in the game window because all the extra math and if then's slow down the filter.

nVidia GeForce 9400GT, 256.xx driver
linuxMint 9, 64-bit%%%

**Category**: Rendering %%%As an example here is an attached .blend containing a simple star 2d filter. Everything looks great -- but what are those ugly artifacts around the edge? Well it's obviously the controls from outside of the game window being pulled in. Probably it should be black out of the game window - or better - extended, but I don't know how it works. I don't want to check if the pixel it's computing with is in the game window because all the extra math and if then's slow down the filter. nVidia GeForce 9400GT, 256.xx driver linuxMint 9, 64-bit%%%

Jacob F commented

2010-08-18 20:08:54 +02:00

Changed status to: 'Open'

Dalai Felinto commented

2010-08-18 20:37:24 +02:00

%%%Hi,
without even looking at your file I can say: you have to learn how to deal with that. The BlenderPlayer handles that differently since there is no UI around it (therefore it will be black). Give it a try and write down here whether it still bothers you. Also, please be specific about what version of Blender you are using (2.49? 2.53? ...)

If you use glTexture- [x] you have a normalized coordinates running from 0,0 (bottom left) to 1,1 (top,right) of the canvas. You can use it to make sure you don't run into those problems.%%%

%%%Hi, without even looking at your file I can say: you have to learn how to deal with that. The BlenderPlayer handles that differently since there is no UI around it (therefore it will be black). Give it a try and write down here whether it still bothers you. Also, please be specific about what version of Blender you are using (2.49? 2.53? ...) If you use glTexture- [x] you have a normalized coordinates running from 0,0 (bottom left) to 1,1 (top,right) of the canvas. You can use it to make sure you don't run into those problems.%%%

Jacob F commented

2010-08-18 20:55:42 +02:00

%%%Sorry, I'm using 2.5 revision 31445.
I haven't ever used the blender player thing, but if I make the 3dview the only view and get rid of headers, toolbars the problem goes away.
I will look into using glTexture- [x] and see if I can work around it.%%%

%%%Sorry, I'm using 2.5 revision 31445. I haven't ever used the blender player thing, but if I make the 3dview the only view and get rid of headers, toolbars the problem goes away. I will look into using glTexture- [x] and see if I can work around it.%%%

Jacob F commented

2010-08-19 19:23:25 +02:00

%%%Clamping the texture coords to 0.0 and 1.0 clamps to the entire Blender window. Now, I'm sure I can make a script run at the start to set game properties with the offset of the game window, but would you agree the game window should have an isolated texture, or no?
Clamping to TexCoord- [x] give me the whole blender window in the game window, see texcoord3.png.%%%

%%%Clamping the texture coords to 0.0 and 1.0 clamps to the entire Blender window. Now, I'm sure I can make a script run at the start to set game properties with the offset of the game window, but would you agree the game window should have an isolated texture, or no? Clamping to TexCoord- [x] give me the whole blender window in the game window, see texcoord3.png.%%%

Jacob F commented

2010-09-02 00:01:17 +02:00

%%%Dalai,

"If you use glTexture- [x] you have a normalized coordinates running
from 0,0 (bottom left) to 1,1 (top,right) of the canvas. You
can use it to make sure you don't run into those problems."

I still can't get this working since gl_TexCoord- [x] gives me across the whole window and gl_TexCoord- [x] gives me just the positions in the game window and I can't compare them somehow because I don't know where the game window is positioned and I can't get it with python either. How did you do it?%%%

%%%Dalai, "If you use glTexture- [x] you have a normalized coordinates running from 0,0 (bottom left) to 1,1 (top,right) of the canvas. You can use it to make sure you don't run into those problems." I still can't get this working since gl_TexCoord- [x] gives me across the whole window and gl_TexCoord- [x] gives me just the positions in the game window and I can't compare them somehow because I don't know where the game window is positioned and I can't get it with python either. How did you do it?%%%

Dalai Felinto commented

2010-09-02 08:32:13 +02:00

%%%I gave a look at the shader and I see your problem. You need a way to find the gl_TexCoords- [x] equivalent to the calculated 'coords'. That's doable, but it works properly only in the bottom left window.

Take a look at this file, it has a few samples of how to use this. Including this convertion from gl_TexCoords- [x] to - [x] and the other way around.

http://projects.blender.org/plugins/scmsvn/viewcvs.php/trunk/lib/tests/gameengine_visual/GLSL_samples_249.blend?root=bf-blender&view=log

I agree that "the game window should have an isolated texture" but the real fix for that is really complicated (ATI behaves really different to NVidia on that matter). Maybe in Blender 2.5 that is easier to fix. I doubt it.%%%

%%%I gave a look at the shader and I see your problem. You need a way to find the gl_TexCoords- [x] equivalent to the calculated 'coords'. That's doable, but it works properly only in the bottom left window. Take a look at this file, it has a few samples of how to use this. Including this convertion from gl_TexCoords- [x] to - [x] and the other way around. http://projects.blender.org/plugins/scmsvn/viewcvs.php/trunk/lib/tests/gameengine_visual/GLSL_samples_249.blend?root=bf-blender&view=log I agree that "the game window should have an isolated texture" but the real fix for that is really complicated (ATI behaves really different to NVidia on that matter). Maybe in Blender 2.5 that is easier to fix. I doubt it.%%%

Mitchell Stokes commented

2012-06-28 11:38:46 +02:00

%%%Fixed in r48366. Let me know if you're still having problems (I'm closing this report for now, but it can be reopened).%%%

Mitchell Stokes commented

2012-06-28 11:38:48 +02:00

Changed status from 'Open' to: 'Resolved'

Mitchell Stokes closed this issue

2012-06-28 11:38:48 +02:00

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texture2D in custom 2D filters can get texture outside of game, resulting in ugliness #23375