Ok, in course of my game development I realized that I have to switch myself to deferred rendering. Everything was working fine when all my position, normals and light were in world space. But when I set then in view space the normals changed depending upon the camera's orientation. So my light should also behave the same way to properly lit the model. I multiplied the light direction with the worldView Matrix. But still when I change my camera orientation the model goes from bright to dark color. Here is my deferred lighting code:
struct Mtrl{ float4 ambient; float4 diffuse; float4 spec; float specPower;};struct DirLight{ float4 ambient; float4 diffuse; float4 spec; float3 dirW; };uniform extern float4x4 gWorld;uniform extern float4x4 gWorldInv;uniform extern float4x4 gWVP;uniform extern Mtrl gMtrl;uniform extern DirLight gLight;uniform extern float3 gEyePosW;uniform extern texture gTex;uniform extern texture gNormalMap;uniform extern float4x4 gView;uniform extern float4x4 worldView;uniform extern texture sceneMaterialMap, sceneNormalMap, scenePositionXYMap, scenePositionZMap, gEnvMap;sampler EnvMapS = sampler_state{ Texture = <gEnvMap>; MinFilter = Anisotropic; MagFilter = LINEAR; MipFilter = LINEAR; AddressU = WRAP; AddressV = WRAP;};sampler textureSampler = sampler_state{ Texture = <sceneMaterialMap>; MinFilter = ANISOTROPIC; MaxAnisotropy = 16; MagFilter = LINEAR; MipFilter = LINEAR; AddressU = WRAP; AddressV = WRAP;};sampler normalSampler = sampler_state{ Texture = <sceneNormalMap>; MinFilter = ANISOTROPIC; MaxAnisotropy = 16; MagFilter = LINEAR; MipFilter = LINEAR; AddressU = WRAP; AddressV = WRAP;};sampler positionXYSampler = sampler_state{ Texture = <scenePositionXYMap>; MinFilter = ANISOTROPIC; MaxAnisotropy = 16; MagFilter = LINEAR; MipFilter = LINEAR; AddressU = WRAP; AddressV = WRAP;};sampler positionZSampler = sampler_state{ Texture = <scenePositionZMap>; MinFilter = ANISOTROPIC; MaxAnisotropy = 16; MagFilter = LINEAR; MipFilter = LINEAR; AddressU = WRAP; AddressV = WRAP;};sampler TexS = sampler_state{ Texture = <gTex>; MinFilter = ANISOTROPIC; MaxAnisotropy = 16; MagFilter = LINEAR; MipFilter = LINEAR; AddressU = WRAP; AddressV = WRAP;};sampler NormalMapS = sampler_state{ Texture = <gNormalMap>; MinFilter = ANISOTROPIC; MaxAnisotropy = 16; MagFilter = LINEAR; MipFilter = LINEAR; //AddressU = WRAP; //AddressV = WRAP; }; struct OutputVS{ float4 vPos : POSITION0; float2 vTex0 : TEXCOORD0; float3 vWorldPos : TEXCOORD1; float3 vWorldNrm : TEXCOORD2; };struct OutputPS{ float4 vMaterial : COLOR0; float4 vWorldNrm : COLOR1; float4 vWorldPosXY : COLOR2; float4 vWorldPosZ : COLOR3;};OutputVS NormalMapVS(float3 posL : POSITION0, float3 tangentL : TANGENT0, float3 binormalL : BINORMAL0, float3 normalL : NORMAL0, float2 tex0 : TEXCOORD0){ OutputVS outVS = (OutputVS)0; //worldView = mul(gWorld, gView); outVS.vWorldPos = mul(float4(posL, 1), gWorld); outVS.vPos = mul(float4(outVS.vWorldPos, 1), gWVP); outVS.vTex0 = tex0; outVS.vWorldNrm = normalize(mul(float4(normalL, 0), worldView)); return outVS; }OutputPS NormalMapPS(OutputVS i) : COLOR{ OutputPS o; float4 vDiffuseMaterial = tex2D(TexS, i.vTex0); clip(vDiffuseMaterial.a - 0.2f); o.vMaterial.rgb = vDiffuseMaterial; o.vMaterial.a = 1.0; o.vWorldNrm.xyz = 0.5f * i.vWorldNrm + 1.0; o.vWorldNrm.w = 0.0; o.vWorldPosXY = float4(i.vWorldPos.xy, 0, 0); o.vWorldPosZ = float4(i.vWorldPos.z, 0, 0, 0); return o; }float4 deferredLighting(float2 tex0:TEXCOORD0):COLOR{ float3 diffuseMaterial = tex2D(textureSampler, tex0); float3 worldNormal = 2*tex2D(normalSampler, tex0) - 1; float3 worldPos; worldPos.xy = tex2D(positionXYSampler, tex0).xy; worldPos.z = tex2D(positionZSampler, tex0).z; float3 lightDir = normalize(mul(gLight.dirW, worldView)); //float3 lightDir = normalize(gLight.dirW); float4 color; color.rgb = dot(lightDir, worldNormal) * gLight.diffuse * diffuseMaterial + gLight.ambient * diffuseMaterial; color.a = 1.0f; return color; }technique NormalMapTech{ pass P0 { vertexShader = compile vs_3_0 NormalMapVS(); pixelShader = compile ps_3_0 NormalMapPS(); }}technique DeferredLightTechnique{ pass p0 { VertexShader = NULL; PixelShader = compile ps_2_0 deferredLighting(); CullMode = none; FillMode = solid; Zenable = false; StencilEnable = false; /*AlphaBlendEnable = true; Srcblend = One; Destblend = One; AlphaTestEnable = false; ColorWriteEnable = red | green | blue;*/ }};Also note the light is a single directional light.
Please help. Thanks.
