public static Vector3[] ProjectFrustumOnXZPlane(this Camera camera)
{
Plane plane = new Plane(Vector3.up, Vector3.zero);
Plane[] planes = GeometryUtility.CalculateFrustumPlanes(camera);
Line L0;
MUtils.Intersects(planes[0], plane, out L0);
Line L1;
MUtils.Intersects(planes[1], plane, out L1);
Line L2;
MUtils.Intersects(planes[2], plane, out L2);
Line L3;
MUtils.Intersects(planes[3], plane, out L3);
Line2D l2d0 = MappingAxis.Map(L0);
Line2D l2d1 = MappingAxis.Map(L1);
Line2D l2d2 = MappingAxis.Map(L2);
Line2D l2d3 = MappingAxis.Map(L3);
float s, t;
l2d0.Intersects(l2d2, out t, out s);
Vector3 rightTop = MappingAxis.Map(l2d0.GetPoint(t));
l2d0.Intersects(l2d3, out t, out s);
Vector3 rightBottom = MappingAxis.Map(l2d0.GetPoint(t));
l2d1.Intersects(l2d2, out t, out s);
Vector3 leftTop = MappingAxis.Map(l2d1.GetPoint(t));
l2d1.Intersects(l2d3, out t, out s);
Vector3 leftBottom = MappingAxis.Map(l2d1.GetPoint(t));
return(new Vector3[] { leftTop, rightTop, rightBottom, leftBottom });
}
