void UpdateFog()
{
if (map.blocks == null || minimal)
{
return;
}
FastColour fogCol = FastColour.White;
float fogDensity = 0;
BlockOn(out fogDensity, out fogCol);
IGraphicsApi gfx = game.Graphics;
if (fogDensity != 0)
{
gfx.SetFogMode(Fog.Exp);
gfx.SetFogDensity(fogDensity);
}
else if (game.World.Env.ExpFog)
{
gfx.SetFogMode(Fog.Exp);
// f = 1-z/end f = e^(-dz)
// solve for f = 0.01 gives:
// e^(-dz)=0.01 --> -dz=ln(0.01)
// 0.99=z/end --> z=end*0.99
// therefore
// d = -ln(0.01)/(end*0.99)
double density = -Math.Log(0.01) / (game.ViewDistance * 0.99);
gfx.SetFogDensity((float)density);
}
else
{
gfx.SetFogMode(Fog.Linear);
gfx.SetFogEnd(game.ViewDistance);
}
gfx.ClearColour(fogCol);
gfx.SetFogColour(fogCol);
}
