float4x4 matWorldViewProj;

float4 vecFog;

struct VS_IN
{
	float4 position : POSITION;
	float2 texCoord : TEXCOORD0;
};

struct VS_OUT
{
	float4 position : POSITION;
	float2 texCoord : TEXCOORD0;
	float Fog : FOG;
};

VS_OUT mainVS (VS_IN In)
{
	VS_OUT Out;
	Out.position = mul(In.position,matWorldViewProj);
	Out.Fog = (In.position.y/1500)-0.25; // you may need to adjust these values till it fits
	Out.texCoord = In.texCoord;
	return Out;
}

texture entSkin1;

sampler basemap = sampler_state
{
	Texture = <entSkin1>;
	MipFilter = LINEAR;
	MinFilter = LINEAR;
	MagFilter = LINEAR;
	AddressU = Wrap;
	Addressv = Wrap;
};

float4 mainPS (VS_OUT In) : COLOR0
{
	return tex2D(basemap,In.texCoord);
}

technique heightFog
{
	pass p0
	{
		VertexShader = compile vs_1_1 mainVS();
		PixelShader = compile ps_1_1 mainPS();
	}
}

Quote:

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screenshot looks good, except for the goofy bunny. the illusion of landscape depth is awesome. some qs:
- what does the shader do exactly (heightfog- onöy fog on top or on all sides of the dome/cube?),
- how's the impact on frame rate and
- can i choose colors or will it be adjusted according to the sky texture?
- does it work wit a6 and
- can it be applied to a sky cube that's only generated by script (without a model, just a +6 bmp)?

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well, the fog just uses the vertical position as you can tell from the code. the impact on the framerate is 0 and the color is the one you have set for the fog. it works with a6 for sure but you need to test yourself how it works with a skycube (it should work)

hey, dont tell bad things about that great bunny i am very happy badapple did that one

Out.Fog = (In.position.y/1500)-0.25;

Out.Fog = ((In.position.y-1100)/1500)-0.25;