I'm having some issues with specular lights, to be more specific, the specular color seems to be flickering when I set high power, like 512 (I set the specular color to green, so you can see better):
https://i.sstatic.net/SNAmA.gif
And when a power like 32 is used, everything seems ok:
Pixel shader hlsl:
pin.NormalW = normalize(pin.NormalW); float3 toEyeW = normalize(gEyePosW - pin.PosW); // Start with a sum of zero. float4 ambient = float4(0.0f, 0.0f, 0.0f, 0.0f); float4 diffuse = float4(0.0f, 0.0f, 0.0f, 0.0f); float4 spec = float4(0.0f, 0.0f, 0.0f, 0.0f); // Sum the light contribution from each light source float4 A, D, S; ComputeDirectionalLight(gMaterial, gDirLight, pin.NormalW, toEyeW, A, D, S); ambient += A; diffuse += D; spec += S; float4 litColor = ambient + diffuse + spec; litColor.a = gMaterial.Diffuse.a; return litColor; ComputeDirectionalLight function:
void ComputeDirectionalLight(Material mat, DirectionalLight L, float3 normal, float3 toEye, out float4 ambient, out float4 diffuse, out float4 spec) { // Initialize outputs. ambient = float4(0.0f, 0.0f, 0.0f, 0.0f); diffuse = float4(0.0f, 0.0f, 0.0f, 0.0f); spec = float4(0.0f, 0.0f, 0.0f, 0.0f); // The light vector aims opposite the direction the light rays travel. float3 lightVec = -L.Direction; // Add ambient term. ambient = mat.Ambient * L.Ambient; // Add diffuse and specular term, provided the surface is in // the line of site of the light. float diffuseFactor = dot(lightVec, normal); // Flatten to avoid dynamic branching. [flatten] if (diffuseFactor > 0.0f) { float3 v = reflect(-lightVec, normal); float specFactor = pow(max(dot(v, toEye), 0.0f), mat.Specular.w); diffuse = diffuseFactor * mat.Diffuse * L.Diffuse; spec = specFactor * mat.Specular * L.Specular; } } I'm using DirectX 11.
