public unsafe ContainmentType Contains(ref BoundingFrustum other)
{
int pointsContained = 0;
FrustumCorners corners = other.GetCorners();
Vector3 * cornersPtr = (Vector3 *)&corners;
for (int i = 0; i < 8; i++)
{
if (Contains(cornersPtr[i]) != ContainmentType.Disjoint)
{
pointsContained++;
}
}
if (pointsContained == 8)
{
return(ContainmentType.Contains);
}
else if (pointsContained == 0)
{
return(ContainmentType.Disjoint);
}
else
{
return(ContainmentType.Intersects);
}
}
public static void GetCorners(float eyeX, float eyeY, float eyeZ, float viewX, float viewY, float viewZ)
{
Vector3 viewOrigin = new Vector3(eyeX, eyeY, eyeZ);
Vector3 viewDir = Vector3.Normalize(new Vector3(viewX, viewY, viewZ));
Matrix4x4 view = Matrix4x4.CreateLookAt(viewOrigin, viewDir, Vector3.UnitY);
const float nearDist = 2f;
const float farDist = 10f;
const float fov = 1.0f;
const float ratio = 1.0f;
Matrix4x4 perspectiveProj = Matrix4x4.CreatePerspectiveFieldOfView(fov, ratio, nearDist, farDist);
BoundingFrustum frustum = new BoundingFrustum(view * perspectiveProj);
FrustumCorners corners = frustum.GetCorners();
Vector3 nearCenter = viewOrigin + viewDir * nearDist;
float nearHalfHeight = (float)Math.Tan(fov / 2f) * nearDist;
float nearHalfWidth = nearHalfHeight * ratio;
Vector3 up = Vector3.Transform(Vector3.UnitY, view);
Vector3 right = -Vector3.Cross(up, viewDir);
FuzzyComparer fuzzyComparer = new FuzzyComparer();
AssertEqual(nearCenter - nearHalfWidth * right + nearHalfHeight * up, corners.NearTopLeft, fuzzyComparer);
AssertEqual(nearCenter + nearHalfWidth * right + nearHalfHeight * up, corners.NearTopRight, fuzzyComparer);
AssertEqual(nearCenter - nearHalfWidth * right - nearHalfHeight * up, corners.NearBottomLeft, fuzzyComparer);
AssertEqual(nearCenter + nearHalfWidth * right - nearHalfHeight * up, corners.NearBottomRight, fuzzyComparer);
Vector3 farCenter = viewOrigin + viewDir * farDist;
float farHalfHeight = (float)Math.Tan(fov / 2f) * farDist;
float farHalfWidth = farHalfHeight * ratio;
AssertEqual(farCenter - farHalfWidth * right + farHalfHeight * up, corners.FarTopLeft, fuzzyComparer);
AssertEqual(farCenter + farHalfWidth * right + farHalfHeight * up, corners.FarTopRight, fuzzyComparer);
AssertEqual(farCenter - farHalfWidth * right - farHalfHeight * up, corners.FarBottomLeft, fuzzyComparer);
AssertEqual(farCenter + farHalfWidth * right - farHalfHeight * up, corners.FarBottomRight, fuzzyComparer);
}
