Hi,
I'm having a special case of alphablending: I want to use a texture that only has eigther solid (a = 1.0) or completely transparent (a = 0.0) pixels (flags whose edges are torn). I'll have a lot of these objects in nearly every level of the game, so I don't want to waste performance on sorting them from back to front. Is there a way to tell directx not to render completely transparent pixel into the z-buffer?
[DX9] Transparent pixels: no z-value
Sure. Look into "alpha testing" (D3DRS_ALPHATESTENABLE). It's a basic 3D functionality.
If you need accurate boundaries, you might want to look into this paper.
You also have the choice to call clip() in the pixel shader: be careful with that as it interacts poorly with some (most?) D3D9-grade adapters. Alpha testing is your first choice.
If you need accurate boundaries, you might want to look into this paper.
You also have the choice to call clip() in the pixel shader: be careful with that as it interacts poorly with some (most?) D3D9-grade adapters. Alpha testing is your first choice.
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