Deferred rendering diffuse

Tasaq · 2012-04-12T20:22:40

I have problems with point lights, when it's position in x or y is negative everything goes black(smoothly). I attached screnshot with final buffer, from top ambientBuffer, depthBuffer (the light blue part is textured mesh, and I am only working with non textured areas right now), normalBuffer Here's the code for light calculation and reconstruction of position from depth: texture normal; texture depth; texture ambient; float3 EyeVec; float3 lightPos; float4x4 InvertedProjectionMat; sampler normSamp : register (s1) = sampler_state { texture = <normal>; }; sampler depSamp : register (s2) = sampler_state { texture = <depth>; }; sampler ambSamp : register (s3) = sampler_state { texture = <ambient>; }; float3 getPosFromDepth(float2 texCoord) { float z = length(tex2D(depSamp, texCoord).rgb); float x = texCoord.x * 2 - 1; float y = (1 - texCoord.y) * 2 - 1; float4 vProjectedPos = float4(x, y, z, 1.0f); float4 vPositionVS = mul(vProjectedPos, InvertedProjectionMat); return vPositionVS.xyz / tex2D(depSamp, texCoord).w; } struct PixelShaderInput { float2 texCoord : TEXCOORD0; }; float4 PixelShaderFunction(PixelShaderInput input) : COLOR0 { float4 Color; Color = tex2D(ambSamp, input.texCoord); if(length(Color) == 0) return float4(0.2f, 0.4f, 0.9f, 1.0f);; float4 SpecularColor = float4(1.0f, 1.0f, 0.0f, 1.0f); float specularLVL; float3 Position = getPosFromDepth( input.texCoord); float3 Normal = normalize(tex2D(normSamp, input.texCoord)).rgb; float3 LightVector = normalize( lightPos.xyz - Position.xyz ); float NdL = dot(Normal, LightVector); float3 Eye = normalize(EyeVec ); float3 halfVec = reflect(LightVector, Normal); specularLVL = pow(dot(halfVec, Eye), 100); return Color * NdL;// + (0.7f * specularLVL * SpecularColor); } technique Technique1 { pass Pass1 { PixelShader = compile ps_2_0 PixelShaderFunction(); } } Some mess inside the code is caused by me loosing my mind and start typing random stuff ' Also as I am posting something on forums (which I try to do only in an act of desperation )... what is good way to handle lighting with deferred shading? I kinda got lost with all those documentations found on internet Anyway I will appreciate any help and thank You in advice

Graphics and GPU Programming Programming

Started by Tasaq April 11, 2012 06:31 PM

11 comments, last by jischneider 12 years ago

jischneider

253

April 12, 2012 07:43 PM

And what surface formats do you use in this GBuffer? I predict a lack of precision. 8 bits per channel are not enough, and more important don’t store negative values.

Use a R32F to store the depth (only the depth), be aware that Z is managed different in OpenGL/XNA and DirectX. For now you should use a 1010102 format to store normals in a floating point format.

If you are serious about this you should do things correctly for the start. Deferred rendering is not an easy topic.

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Tasaq

1,530

Author

April 12, 2012 08:11 PM

If you are serious about this you should do things correctly for the start. Deferred rendering is not an easy topic.

I am doing it for fun mostly, and educate myself, and for passion. I know it's not easy, but I love challlenges

And finally, changing format did the trick!

I love you! xD thanks for all the help

I used hdrBlendable, it's the only format i get to use now because others throw exceptions, but now I should manage to do the rest. I also 'uncomented' specular and it works like a charm

Now I need to clean the mess I made in code and make everything more optimised ^^ You should be a tutor(if you are not one that is), because you explain stuff better than tutors at my univesity >_> Oh and rep for You, thanks again for all help