Looks great. Have a good vacation.

The proper name for this is Fresnel Shading, and it’s very nice indeed. Tuned right it can make skin look real, cartoons look hand-drawn and metal look fantastic.

hi im mo and i like this RimShader and when i tried to use it on my Game Environment it give me this Error “Object reference not set to an instance of an object.” and im using XNA 2.0 thnx for help.

Matrix[] bones;
bones = new Matrix[level.Bones.Count];
level.CopyBoneTransformsTo(bones);

foreach (ModelMesh mesh in level.Meshes)
{
foreach (Effect effects in mesh.Effects)
{ effects.Parameters[“World”].SetValue(bones[mesh.ParentBone.Index]);
effects.Parameters[“View”].SetValue(view);
effects.Parameters[“ViewI”].SetValue(Matrix.Invert(view));
effects.Parameters[“Projection”].SetValue(Projection);

//customize the effect
effects.Parameters[“Rim_Start”].SetValue(0.4f);
effects.Parameters[“Rim_End”].SetValue(1.0f);
effects.Parameters[“Rim_Multiplier”].SetValue(0.9f);
effects.Parameters[“Rim_Color”].SetValue(Color.White.ToVector4());

//Other Variants
////////////////////////////////////////////////////////////////////////////
// Rim_Start || Rim_End || Rim_Multiplier || Rim_Color ||
////////////////////////////////////////////////////////////////////////////
// 0.5f || 0.1f || 0.5f || PeachPuff ||
// 0.4f || 1.0f || 1.6f || Red ||
// 0.4f || 0.5f || -1.4f || White ||
// 0.0f || 1.0f || 0.5f || Chocolate ||
// 0.1f || 0.3f || 0.8f || SlateBlue ||
///////////////////////////////////////////////////////////////////////////
}
mesh.Draw();
}

Your model probably doesn’t have the effect set on it. So when trying to access the ViewI parameters, which is a parameter of the RimLighting.fx effect, it cannot be found, so it returns a null.

In my sample, I used a ContentProcessor to apply the effect on the models I want to use rim lighting on.

The shader in the example doesn’t support untextured models.
You would have to modify the shader, and possibly the ContentProcessor

Try the shader series: http://creators.xna.com/en-US/article/shader_primer