void ZFXAabb::GetPlanes(ZFXPlane* pPlanes){
ZFXVector vcN;
if(!pPlanes) return;
vcN.Set(1.0f,0.0f,0.0f);
pPlanes[0].Set(vcN,vcMax);
vcN.Set(-1.0f,0.0f,0.0f);
pPlanes[0].Set(vcN,vcMin);
vcN.Set(0.0f,0.0f,-1.0f);
pPlanes[0].Set(vcN,vcMin);
vcN.Set(0.0f,0.0f,1.0f);
pPlanes[0].Set(vcN,vcMax);
vcN.Set(0.0f,1.0f,0.0f);
pPlanes[0].Set(vcN,vcMax);
vcN.Set(0.0f,-1.0f,0.0f);
pPlanes[0].Set(vcN,vcMin);
}
// get the six planes, normals pointing outwards
void ZFXAabb::GetPlanes(ZFXPlane *pPlanes) {
ZFXVector vcN;
if (!pPlanes) return;
// right side
vcN.Set(1.0f, 0.0f, 0.0f);
pPlanes[0].Set(vcN, vcMax);
// left side
vcN.Set(-1.0f, 0.0f, 0.0f);
pPlanes[1].Set(vcN, vcMin);
// front side
vcN.Set(0.0f, 0.0f, -1.0f);
pPlanes[2].Set(vcN, vcMin);
// back side
vcN.Set(0.0f, 0.0f, 1.0f);
pPlanes[3].Set(vcN, vcMax);
// top side
vcN.Set(0.0f, 1.0f, 0.0f);
pPlanes[4].Set(vcN, vcMax);
// bottom side
vcN.Set(0.0f, -1.0f, 0.0f);
pPlanes[5].Set(vcN, vcMin);
} // Intersects(point)
bool ZFXRay::Intersects(const ZFXAabb aabb, ZFXVector *vcHit){
bool bInside=true;
ZFXVector MaxT;
MaxT.Set(-1.0f,-1.0f,-1.0f);
if(m_vcOrig.x < aabb.vcMin.x){
(*vcHit).x=aabb.vcMin.x;
bInside=false;
if (m_vcDir.x!=0.0f)
MaxT.x=(aabb.vcMin.x - m_vcOrig.x) /m_vcDir.x;
}else if(m_vcOrig.x > aabb.vcMax.x){
(*vcHit).x=aabb.vcMax.x;
bInside=false;
if(m_vcDir.x!=0.0f)
MaxT.x=(aabb.vcMax.x - m_vcOrig.x) / m_vcDir.x;
}
if(m_vcOrig.y < aabb.vcMin.y){
(*vcHit).y=aabb.vcMin.y;
bInside=false;
if (m_vcDir.y!=0.0f)
MaxT.y=(aabb.vcMin.y - m_vcOrig.y) /m_vcDir.y;
}else if(m_vcOrig.y > aabb.vcMax.y){
(*vcHit).y=aabb.vcMax.y;
bInside=false;
if(m_vcDir.y!=0.0f)
MaxT.y=(aabb.vcMax.y - m_vcOrig.y) / m_vcDir.y;
}
if(m_vcOrig.z < aabb.vcMin.z){
(*vcHit).z=aabb.vcMin.z;
bInside=false;
if (m_vcDir.z!=0.0f)
MaxT.z=(aabb.vcMin.z - m_vcOrig.z) /m_vcDir.z;
}else if(m_vcOrig.z > aabb.vcMax.z){
(*vcHit).z=aabb.vcMax.z;
bInside=false;
if(m_vcDir.z!=0.0f)
MaxT.z=(aabb.vcMax.z - m_vcOrig.z) / m_vcDir.z;
}
//Ray origin inside the box
if(bInside){
(*vcHit)=m_vcOrig;
return true;
}
int nPlane=0;
if (MaxT.y> ((float*)&MaxT)[nPlane]) nPlane=1;
if (MaxT.z> ((float*)&MaxT)[nPlane]) nPlane=2;
if (((float*)&MaxT)[nPlane]<0.0f) return false;
if(nPlane!=0){
(*vcHit).x=m_vcOrig.x + MaxT.x * m_vcDir.x;
if (((*vcHit).x < aabb.vcMin.x - 0.00001f) ||
((*vcHit).x < aabb.vcMax.x + 0.00001f) )
return false;
}
if (nPlane !=1){
(*vcHit).y=m_vcOrig.y + MaxT.y * m_vcDir.y;
if (((*vcHit).y < aabb.vcMin.y - 0.00001f) ||
((*vcHit).y < aabb.vcMax.y + 0.00001f) )
return false;
}
if (nPlane !=2){
(*vcHit).z=m_vcOrig.z + MaxT.z * m_vcDir.z;
if (((*vcHit).z < aabb.vcMin.z - 0.00001f) ||
((*vcHit).z < aabb.vcMax.z + 0.00001f) )
return false;
}
return true;
}