Z-Buffer. How to access it?
BlitzMax Forums/MiniB3D Module/Z-Buffer. How to access it?
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| Hi all, title says all. I'm experimenting around with things like creating a shadow map, and I was wondering if there is any way to access Z-buffer data? Can you do that at all? Or do you have to find your own way? Thanks for your help (again) :) |
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| glReadPixels or FBOs. glReadPixels does not work for depth buffers in OpenGL ES (mobile). http://www.opengl.org/sdk/docs/man/xhtml/glReadPixels.xml if you are moving your shadow map to a texture, best to use FBOs. |
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| Yeah, while you educate yourself on FBOs you'll see there's a part called "Depth Attachment", a texture attachment where depth information is written to and from which you can read with a fragment shader to get color values. FBOs are also used for plenty of other fullscreen effects, so they are definitely a good choice to learn. There's some BlitzMax literature, along with what you can find on the web: http://blitzbasic.com/Community/posts.php?topic=85608 http://www.blitzbasic.com/Community/posts.php?topic=94635 http://www.blitzbasic.com/Community/posts.php?topic=69804 |
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| Thanks again for your pointers :) I'll read up on those. |
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