Doing fog in shader. If I want to see fog on other side of plane and not see any fog on other side of plane because im doing a mountain scene or something. How can i adjust the plane to a specific location? Right now the plane stays at origin on the x axis.
if (gFogEnabled)
{
float fogDensity = 0.0001;
float kFogEpsilon = 0.0001;
float3 F = float3(1, 0, 0); //Plane
float3 C = gEyePosW; // Camera Position
float3 P = pin.PosW; //Pixel Position
float3 V = C - P; // To Eye Vector
float FV = dot(F, V);
float m;
if (dot(F, C) < 0)
{
m = 1;
}
else
{
m = 0;
}
float u1 = m * (dot(F, C) + dot(F, P));
float u2 = dot(F, P) * sign(dot(F, C));
float x = min(u2, 0.0);
x = 0.5 * fogDensity * -length(V) * (u1 - x * x / (abs(FV) + kFogEpsilon));
float f = saturate(exp2(-x));
litColor.rgb = litColor.rgb * f + gFogColor * (1 - f);
}
