Alphablending difficulties

Original Post

Aug 16, 2006 at 12:13 AM

ok, another relatively simple question: I am rendering a particle system that i have made. It uses sprites to do the particles... 2D... The problem/difficulty im having is that, when i set alpha blending to on, it screws up all the colors and alpha for everything else i rendered (3D). my Question is: is there a way to set which objects are rendered with alpha? or should i do the alpha blending a diff way... device.RenderState.AlphaBlendEnable = true; device.RenderState.SourceBlend = Blend.SourceAlpha; device.RenderState.DestinationBlend = Blend.DestinationAlpha; that is basically all the blending options i change

sirob

Aug 16, 2006 at 12:29 AM

Setting the AlphablendEnable state enables Alpha Blending for anything drawn from that call until you set it to false. So, if you'd want to enable it for only some of your scene, you'd do this:

BeginScene();
Set AlphaBlendEnable = false;
Draw Stuff without AlphaBlending;
Set AlphaBlendEnable = true;
Draw Stuff with AlphaBlending;
EndScene();
Present();

Hope this helps.

perkbrian

Aug 16, 2006 at 1:14 PM

thanks sirob, that worked great

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