Thx jay_p but my scattering file looks like below and I can't quite see what you've changed,
#define SCATTERING
float4 vExtInscMultipliers;
float4 vSunColorIntensity;
float4 vBetaRayleigh;
float4 vBetaDashRayleigh;
float4 vBetaMie;
float4 vBetaDashMie;
float4 vBetaRayleighMie;
float4 vOneOverBetaRM;
float4 vHG;
float4 vConstants;
float3 vFogColor = float3(0.51f, 0.58f, 0.66f);
float2 FogStartEnd = float2(0.0f, 2000.0);
float4 Scattering(float3 vPos, float3 vEyePos, float3 vLightDir, float4 color)
{
float3 vEyeVert = vEyePos - vPos;
float dist = length(vEyeVert.xyz);
vEyeVert = normalize(vEyeVert);
float cosTheta = max(0, dot(vLightDir.xyz, vEyeVert.xyz));
float Phase1theta = cosTheta * cosTheta + 1.0f;
float3 extinction = - vBetaRayleighMie.xyz * dist * vConstants.y;
extinction = exp(-extinction);
float4 r4;
r4.x = vHG.z * cosTheta + vHG.y;
r4.x = rsqrt(r4.x);
r4.y = r4.x * r4.x;
r4.x = r4.y * r4.x;
float Phase2theta = r4.x * vHG.x;
float3 rayleigh = vBetaDashRayleigh *Phase1theta;
float3 mie = vBetaDashMie * Phase2theta;
float3 temp = vConstants.x - extinction;
float3 inscatter = mie + rayleigh;
inscatter*=temp;
inscatter *= vOneOverBetaRM;
inscatter *= vExtInscMultipliers.y;
inscatter *= vSunColorIntensity.xyz * vSunColorIntensity.w;
extinction.xyz *= vSunColorIntensity.xyz * vSunColorIntensity.w;
float4 res = color;
float fog = (FogStartEnd.y * 2 - dist)/(FogStartEnd.y * 2 - FogStartEnd.x);
fog = min(fog, 1);
res.rgb = lerp(vFogColor.xyz, res.rgb, fog);
res.rgb *= saturate(extinction.xyz);
res.rgb += clamp(-inscatter.xyz, 0.0f, 0.25f);
res.rgb = saturate(res.rgb);
return res;
}
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