bool NX::ViewFrustum::Visible(const NX::Ellipse &ellipse, const unsigned int mask){
const NX::vector<float, 3> R = ellipse.GetLongAxis() * ellipse.GetLongAxisLength();
const NX::vector<float, 3> S = ellipse.GetShortAxis() * ellipse.GetShortAxisLength();
const NX::vector<float, 3> C = ellipse.GetCenter();
#undef NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST
#define NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(plane) \
const NX::vector<float, 3> N = plane.GetNormal();\
const float rn = NX::Dot(R, N);\
const float rs = NX::Dot(S, N);\
const float RRef = std::sqrt(rn * rn + rs * rs);\
if(NX::Dot(N, C) + plane.GetDistFromOriginal() < -RRef){\
return false;\
}
if(mask & NX::VF_VT_LEFT){
NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetLeftPlane());
}
if(mask & NX::VF_VT_RIGHT){
NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetRightPlane());
}
if(mask & NX::VF_VT_FRONT){
NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetFrontPlane());
}
if(mask & NX::VF_VT_BACK){
NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetBackPlane());
}
if(mask & NX::VF_VT_TOP){
NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetTopPlane());
}
if(mask & NX::VF_VT_BOTTOM){
NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST(GetBottomPlane());
}
return true;
#undef NX_VIEWFRUSTUM_POSITIVE_SIDE_TEST
}