I hope someone can help me. I'm having difficulty on 360 with my pixel shader. I have been adapting the normalmap sample, but have come across a problem where the texture appears to be lit oddly. That is, it's as if there is some light behind the view / camera.

It's got to the stage where I commented out all the PixelShader code and left the following line only...

return tex2D(DiffuseTextureSampler, input.texCoord);

I hacked the input.texCoord to pick the same texture value all the time and I get a solid colour all over.

input.texCoord = float2(1,1);
return tex2D(DiffuseTextureSampler, input.texCoord);

So, I'm guessing(!) tex2D is filtering somehow and blacking out the colour relative viewer position. I don't get this on the PC by the way.

Any ideas?

Duckocide:

It's got to the stage where I commented out all the PixelShader code and left the following line only...

 

return tex2D(DiffuseTextureSampler, input.texCoord);

 

I hacked the input.texCoord to pick the same texture value all the time and I get a solid colour all over.

input.texCoord = float2(1,1);
return tex2D(DiffuseTextureSampler, input.texCoord);

 

So, I'm guessing(!) tex2D is filtering somehow and blacking out the colour relative viewer position. I don't get this on the PC by the way.

Any ideas?

Please show us the definition of DiffuseTextureSampler in the shader, and where you bind a texture to it in your C#.

Model drawing is as follows (although with the shader practically commented apart from Vertex element, parameter settings are a little rundundant. 
 

// Draw the model.

Matrix[] transforms = new Matrix[model.Bones.Count];
model.CopyAbsoluteBoneTransformsTo(transforms);
foreach (ModelMesh mesh in model.Meshes)
{
    foreach (Effect effect in mesh.Effects)
    {
        Matrix w = transforms[mesh.ParentBone.Index];
        effect.Parameters["World"].SetValue(transforms[mesh.ParentBone.Index] * world * Matrix.CreateTranslation(position));
        effect.Parameters["View"].SetValue(game.MatrixContainer.ViewMatrix);
        effect.Parameters["Projection"].SetValue(game.MatrixContainer.ProjectionMatrix);
        effect.Parameters["TextureOffset"].SetValue(textureOffset);
        effect.Parameters["AmbientLightColor"].SetValue(ambientLightColor);
        effect.Parameters["LightColor"].SetValue(lightColour);
        effect.Parameters["LightPosition"].SetValue(lightPosition);
        effect.Parameters["Shininess"].SetValue(shininess);
        effect.Parameters["SpecularPower"].SetValue(specularPower);
        effect.Parameters["Alpha"].SetValue(alpha);
        effect.Parameters["NormalMapOffset"].SetValue(normalMapOffset);
    }
    mesh.Draw();
}

From the debug, the Renderstate blend values:

  AlphaBlendEnable false bool
  AlphaBlendOperation Add Microsoft.Xna.Framework.Graphics.BlendFunction
  AlphaDestinationBlend InverseSourceAlpha Microsoft.Xna.Framework.Graphics.Blend
  AlphaFunction Greater Microsoft.Xna.Framework.Graphics.CompareFunction
  AlphaSourceBlend One Microsoft.Xna.Framework.Graphics.Blend
  AlphaTestEnable false bool
+  BlendFactor {R:255 G:255 B:255 A:255} Microsoft.Xna.Framework.Graphics.Color
  BlendFunction Add Microsoft.Xna.Framework.Graphics.BlendFunction
  CullMode CullCounterClockwiseFace Microsoft.Xna.Framework.Graphics.CullMode
  DestinationBlend InverseSourceAlpha Microsoft.Xna.Framework.Graphics.Blend
  SeparateAlphaBlendEnabled false bool


Interestingly, if I leave the models original texture on, things are fine. I get the flat texture back. However, when I use my procedurally generated one, I get the problem. Is this a MIP issue?

rockRT1 = Render.CreateRenderTarget(GraphicsDevice, 4, SurfaceFormat.Color, 384, 384);