Transparency | GameDev.net

Original Post

Dec 18, 2002 at 3:47 AM

Ok, I want all pink pixels to not appear when I texture a triangle. I am using the D3DX Function to load a texture (D3DXLoadFromFileEx) or whatever it is. It loads fine and displays almost fine. Wherever there is supposed to be a blank pixel, a black one is drawn instead. Does anyone know why? ALPHABLENDENABLE = true. -Greg

Jim Adams

Dec 18, 2002 at 4:47 AM

What color value are you using for the colorkey? Make sure it has an alpha value of 255 (D3DCOLOR_RGBA(0,0,0255) for instance will mark all black pixels as transparent).

Lupin

Dec 18, 2002 at 8:59 AM

I think you don''t need to enable alpha-blending, but I''m not sure... but you could try to set blending states to:

D3Ddevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
D3Ddevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);

Greg K

Dec 18, 2002 at 10:41 AM

That worked for my normal texture. Is it supposed to be any different for point sprites? (They are still not rendering)
-Greg

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