ON_Plane::ON_Plane(
const ON_3dPoint& P, // point on the plane
const ON_3dPoint& Q, // point on the plane
const ON_3dPoint& R // point on the plane
)
{
CreateFromPoints(P,Q,R);
}
BOOL CFrustum::CreateFromClipPoly(Fvector* p, int count, Fvector& vBase, CFrustum& clip)
{
VERIFY(count<FRUSTUM_MAXPLANES);
VERIFY(count>=3);
sPoly poly1 (p,count);
sPoly poly2;
sPoly* dest = clip.ClipPoly(poly1,poly2);
// here we end up with complete frustum-polygon in 'dest'
if (0==dest) return false;
CreateFromPoints(dest->begin(),dest->size(),vBase);
return true;
}
void CFrustum::CreateFromPortal(sPoly* poly, Fvector& vPN, Fvector& vBase, Fmatrix& mFullXFORM)
{
Fplane P;
P.build_precise((*poly)[0], (*poly)[1], (*poly)[2]);
if (poly->size()>6)
{
SimplifyPoly_AABB(poly, P);
P.build_precise((*poly)[0], (*poly)[1], (*poly)[2]);
}
// Check plane orientation relative to viewer
// and reverse if needed
if (P.classify(vBase) < 0)
{
std::reverse(poly->begin(), poly->end());
P.build_precise((*poly)[0], (*poly)[1], (*poly)[2]);
}
// Base creation
CreateFromPoints(poly->begin(), poly->size(), vBase);
// Near clipping plane
_add(P);
// Far clipping plane
Fmatrix& M = mFullXFORM;
P.n.x = -(M._14 - M._13);
P.n.y = -(M._24 - M._23);
P.n.z = -(M._34 - M._33);
P.d = -(M._44 - M._43);
float denom = 1.0f / P.n.magnitude();
P.n.x *= denom;
P.n.y *= denom;
P.n.z *= denom;
P.d *= denom;
_add(P);
}
GMBoundingSphere GMBoundingSphere::CreateFromFrustum(const GMBoundingFrustum& frustum)
{
GMVector3D corners[8];
frustum.getCorners(corners);
return CreateFromPoints(corners, 8);
}
