private void calculateVectors()
{
Vector4 bottomLeft = new Vector4(-1, -1, 1, 1);
bottomLeft = GenericMethods.Mult(bottomLeft, invModelviewProjectionMatrix);
bottomLeft /= bottomLeft.W;
Vector4 bottomRight = new Vector4(1, -1, 1, 1);
bottomRight = GenericMethods.Mult(bottomRight, invModelviewProjectionMatrix);
bottomRight /= bottomRight.W;
Vector4 topLeft = new Vector4(-1, 1, 1, 1);
topLeft = GenericMethods.Mult(topLeft, invModelviewProjectionMatrix);
topLeft /= topLeft.W;
pointingDirectionUp = topLeft.Xyz - bottomLeft.Xyz;
pointingDirectionRight = bottomRight.Xyz - bottomLeft.Xyz;
}
public virtual bool frustrumCheck(Drawable drawable)
{
Vector4 vSpacePos = GenericMethods.Mult(new Vector4(drawable.Position, 1), modelviewProjectionMatrix);
float range = drawable.boundingSphere;
float distToDrawAble = (position - drawable.Position).Length;
if (distToDrawAble < range * 1.5f)
{
return(true);
}
if (distToDrawAble - range > zFar)
{
return(false);
}
if (vSpacePos.W <= 0)
{
return(false);
}
range /= vSpacePos.W * 0.6f;
if (float.IsNaN(range) || float.IsInfinity(range))
{
return(false);
}
vSpacePos /= vSpacePos.W;
return(
vSpacePos.X < (1f + range) && vSpacePos.X > -(1f + range) &&
vSpacePos.Y < (1f + range * aspect) && vSpacePos.Y > -(1f + range * aspect)
);
}