void PointLightShadowGenerationCheckAddFaces(ref Vector3 lightPosition, ref Sphere meshBoundingSphere, bool[] result)
{
if (pointLightShadowGenerationPlanes == null)
{
pointLightShadowGenerationPlanes = new Plane[6][];
for (int nFace = 0; nFace < 6; nFace++)
{
PointLightFace face = PointLightFace.PositiveX;
//flipped
switch (nFace)
{
case 0: face = PointLightFace.NegativeY; break;
case 1: face = PointLightFace.PositiveY; break;
case 2: face = PointLightFace.PositiveZ; break;
case 3: face = PointLightFace.NegativeZ; break;
case 4: face = PointLightFace.PositiveX; break;
case 5: face = PointLightFace.NegativeX; break;
}
var planes = GetPlanesForPointLightShadowGeneration(/* Vec3.Zero, */ face);
pointLightShadowGenerationPlanes[nFace] = planes;
}
}
var sphereLocalOrigin = meshBoundingSphere.Origin - lightPosition;
for (int nFace = 0; nFace < 6; nFace++)
{
var planes = pointLightShadowGenerationPlanes[nFace];
bool add = true;
for (int n = 0; n < planes.Length; n++)
{
double distance = planes[n].GetDistance(sphereLocalOrigin); // meshSphere.Origin );
if (distance < -meshBoundingSphere.Radius)
{
add = false;
break;
}
}
result[nFace] = add;
}
}
static Plane[] GetPlanesForPointLightShadowGeneration(/*Vec3 lightPosition, */ PointLightFace face)
{
Vector3[] points = new Vector3[4];
switch (face)
{
case PointLightFace.PositiveX:
points[0] = new Vector3(1, -1, -1);
points[1] = new Vector3(1, -1, 1);
points[2] = new Vector3(1, 1, 1);
points[3] = new Vector3(1, 1, -1);
break;
case PointLightFace.NegativeX:
points[0] = new Vector3(-1, 1, -1);
points[1] = new Vector3(-1, 1, 1);
points[2] = new Vector3(-1, -1, 1);
points[3] = new Vector3(-1, -1, -1);
break;
case PointLightFace.PositiveY:
points[0] = new Vector3(1, 1, -1);
points[1] = new Vector3(1, 1, 1);
points[2] = new Vector3(-1, 1, 1);
points[3] = new Vector3(-1, 1, -1);
break;
case PointLightFace.NegativeY:
points[0] = new Vector3(-1, -1, -1);
points[1] = new Vector3(-1, -1, 1);
points[2] = new Vector3(1, -1, 1);
points[3] = new Vector3(1, -1, -1);
break;
case PointLightFace.PositiveZ:
points[0] = new Vector3(-1, 1, 1);
points[1] = new Vector3(1, 1, 1);
points[2] = new Vector3(1, -1, 1);
points[3] = new Vector3(-1, -1, 1);
break;
case PointLightFace.NegativeZ:
points[0] = new Vector3(-1, -1, -1);
points[1] = new Vector3(1, -1, -1);
points[2] = new Vector3(1, 1, -1);
points[3] = new Vector3(-1, 1, -1);
break;
}
Plane[] clipPlanes = new Plane[4];
for (int n = 0; n < 4; n++)
{
clipPlanes[n] = Plane.FromPoints(Vector3.Zero, points[(n + 1) % 4], points[n]);
}
//clipPlanes[ n ] = Plane.FromPoints( lightPosition, lightPosition + points[ ( n + 1 ) % 4 ], lightPosition + points[ n ] );
return(clipPlanes);
}