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Is there BasicEffect.Fog in Xen?

Mar 11, 2010 at 1:46 AM


I want that distance objects look blurry or gray. I searched MSDN, find that BasicEffect.Fog parameter in XNA.

Is there same effect in Xen?




Mar 11, 2010 at 5:58 PM

Nope, the MaterialShader does not implement fog.

However, you can add it yourself inside Material.fx. The following code is from BasicEffect.fx (

// Compute fog factor
float ComputeFogFactor(float d)
    return clamp((d - FogStart) / (FogEnd - FogStart), 0, 1) * FogEnabled;

Then to compute the fog factor use ComputeFogFactor(length(EyePosition - position_ws)); either in the vertex shader or pixel shader.


Mar 12, 2010 at 12:09 AM

Hi. Yes, MaterialShader doesn't support fog. I made the decision to keep the number of shader combinations down - however it could be added as an 'always on' feature. (As I'm sure you have noticed, MaterialShader is *rather* complex under the hood :-)

Mar 12, 2010 at 2:48 AM

Thanks arriu, StatusUnknown!