technique OneLight
{
pass pass0
{
VertexShader = compile vs_2_0 VS(0);
PixelShader = compile ps_2_0 PS(0);
}
}
technique TwoLight
{
pass pass0
{
VertexShader = compile vs_2_0 VS(0);
PixelShader = compile ps_2_0 PS(0);
}
pass pass1
{
AlphaBlendEnable = true;
SrcBlend=srcalpha;
DestBlend=invsrcColor;
VertexShader = compile vs_2_0 VS(1);
PixelShader = compile ps_2_0 PS(1);
}
}
Multiple lighting passes in a shader
Author
I am trying to multiple lights through multipassing in a shader. I know my lighting is fine because when I do the first technique (OneLight) everything runs smoothly. For the second pass I thought all I had to do was enable blending and change the blending modes. Is this true? I also made sure my values in the second light was correct by sending in the index of on my first pass for the light. Here is what I do for my technique. Is this all that I need? (Well, I hope not because it just looks wrong with the blending).
You want additive blending, not alpha-based blending. Also, do you update your second pass's lighting parameters with the second light's data?
Author
I do set the second lights parameters correctly. How do I do additive blending? I do not see a render state to set. I have checked all the msdn hlsl docs
Author
I have tried doing what you said and I still get undesired results. I have tried it with AlphaBlendEnable = true and with it not on. Is this what you expect the code to be?
technique TwoLight{ pass pass0 { VertexShader = compile vs_2_0 VS(0); PixelShader = compile ps_2_0 PS(0); } pass pass1 { //AlphaBlendEnable = true; SrcBlend=ONE; DestBlend=ONE; BlendOp = ADD; VertexShader = compile vs_2_0 VS(1); PixelShader = compile ps_2_0 PS(1); }}
Well, posting a screen shot of what 1 light looks like as well as what 2 lights look like would help out, because right now "it doesn't look right" doesn't really ring a bell in anyone's head [grin]
Author
For some reason the light pass doesn't render the effect on the last plane. I render everything in this order.
- Set Technique For TwoLight
for(number of quads)
{
Set Matrix, ect information
for(number of passes)
{
BeginPass
Render
EndPass
}
}
That is how it is suppose to be right?
First Light:
http://www.4freeimagehost.com/show.php?i=6c427c1835da.jpg
Second Light:
http://www.4freeimagehost.com/show.php?i=af14fd6b470e.jpg
With The TwoLight Shader
http://www.4freeimagehost.com/show.php?i=9b68af08b84d.jpg
- Set Technique For TwoLight
for(number of quads)
{
Set Matrix, ect information
for(number of passes)
{
BeginPass
Render
EndPass
}
}
That is how it is suppose to be right?
First Light:
http://www.4freeimagehost.com/show.php?i=6c427c1835da.jpg
Second Light:
http://www.4freeimagehost.com/show.php?i=af14fd6b470e.jpg
With The TwoLight Shader
http://www.4freeimagehost.com/show.php?i=9b68af08b84d.jpg
technique TwoLight{ pass pass0 { VertexShader = compile vs_2_0 VS(0); PixelShader = compile ps_2_0 PS(0); } pass pass1 { AlphaBlendEnable = true; SrcBlend= ONE; DestBlend=ONE; BlendOp = ADD; VertexShader = compile vs_2_0 VS(1); PixelShader = compile ps_2_0 PS(1); }}
Have you done anything weird with the ZFUNC? It should be LESSEQUAL on the first pass, and EQUAL on subsequent passes. I doubt a problem there would lead to those bizarre screenshots, tho.
Author
Well the first two screen shots are fine, it is when I mix them that I have a problem.
I did not do anything with ZFUNC and I did not know I had to change anything for blending on the first pass? Do I have to?
I did not do anything with ZFUNC and I did not know I had to change anything for blending on the first pass? Do I have to?
This topic is closed to new replies.
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