Alpha Blending
December 31, 2002 09:14 PM
If I want to have alpha-blended and non-alpha blended objects in a game, do I need to depth sort all the objects? (I''m using Direct3D). Suppose this: I render a (opaque) tree somewhere. Then I render something that supposed to be alpha blended behind it. Will the alpha-blended object render correctly, or do I need to depth-sort my objects?
1,298
January 01, 2003 04:46 AM
Yeah, if you don''t the stuff behind the transparent object won''t get drawn because its behind whats already in the depth buffer. At least thats how it works with OpenGL.
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814
January 01, 2003 09:19 AM
You can first render all non-transparent objects with the z buffer, and then render the remaining transparant polygons in the back to front order, with the z-read still turned on
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January 01, 2003 01:26 PM
quote: Original post by quasar3d
You can first render all non-transparent objects with the z buffer, and then render the remaining transparant polygons in the back to front order, with the z-read still turned on
do you mean z-write turned off?
997
January 01, 2003 04:25 PM
I don''t know how things are in D3D, but in OGL, you don''t want to disable the Z buffer, just disable the writting in the Z buffer.
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814
January 04, 2003 06:20 PM
quote: Original post by Anonymous PosterOriginal post by quasar3d
You can first render all non-transparent objects with the z buffer, and then render the remaining transparant polygons in the back to front order, with the z-read still turned on
do you mean z-write turned off?
Doesn''t really matter. ''cause you have turnet z read off, and transparent polygons are the last polygons you will render, so you don''t need the zbuffer any more
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