bool MapBlock::GetPatchIntersect(int index, const Ray& ray, float& tMin) const {
int ox = (index / 16) * 4;
int oy = (index % 16) * 4;
Vector3 root = mTransform.GetTranslate() + Vector3(2.5f * ox, -2.5f * oy, 0.0f);
Vector3 trans = root;
float t;
bool ret = false;
for(unsigned int x = 0; x < 5; ++x){
for(unsigned int y = 0; y < 5; ++y){
int ix = ox + x;
int iy = oy + y;
Vector3 v1(trans.x, trans.y, trans.z + mHeightmap->GetHeight(ix, iy));
Vector3 v2(trans.x + 2.5f, trans.y, trans.z + mHeightmap->GetHeight(ix+1,iy));
Vector3 v3(trans.x, trans.y - 2.5f, trans.z + mHeightmap->GetHeight(ix, iy+1));
if(!ray.IntersectTriangle(v1, v3, v2, t)){
Vector3 v4(trans.x + 2.5f, trans.y - 2.5f, trans.z + mHeightmap->GetHeight(ix+1,iy+1));
if(!ray.IntersectTriangle(v2, v3, v4, t)){
trans.y -= 2.5f;
continue;
}
}
if(t < tMin)
tMin = t;
ret = true;
}
trans.x += 2.5f;
trans.y = root.y;
}
return ret;
}
bool MapBlock::CastRayDown(const Ray& ray, float& tMin) const {
Vector3 mpos = mTransform.GetTranslate();
mpos.x = ray.mPoint.x - mpos.x;
mpos.y = mpos.y - ray.mPoint.y;
int ix = int(mpos.x / 2.5f) % 64;
int iy = int(mpos.y / 2.5f) % 64;
float tX = mpos.x - float(ix)*2.5f;
float tY = mpos.y - float(iy)*2.5f;
Vector3 v1(0.0f, 0.0f, mHeightmap->GetHeight(ix, iy));
Vector3 v2(2.5f, 0.0f, mHeightmap->GetHeight(ix+1,iy));
Vector3 v3(0.0f, 2.5f, mHeightmap->GetHeight(ix, iy+1));
Vector3 rPoint(tX, tY, ray.mPoint.z);
Ray nRay = Ray(rPoint, ray.mDirection);
if(!nRay.IntersectTriangle(v1, v2, v3, tMin)){
Vector3 v4(2.5f, 2.5f, mHeightmap->GetHeight(ix+1,iy+1));
if(!nRay.IntersectTriangle(v2, v4, v3, tMin)) return false;
}
return true;
}
bool RayCallback( vector< KDTreeNode * > &nodes)
{
mp_Intersected = false;
Vec3 v0, v1, v2;
if( nodes.size() > 0 &&
//node->pntidx >= 0 &&
mp_MeshP ) //leaf node
{
//test against triangle index
static double su, st, sv;
double temp = 999999;
int numNodes = nodes.size();
for( int i = 0; i < numNodes; i++ )
{
KDTreeNode * node = nodes[ i ];
int size = node->objectList.size();
INDEXLIST::iterator iter = node->objectList.begin();
for( ; iter != node->objectList.end(); ++iter )
{
int TriIndex =(*iter); //index refers to vertices, 3 verts per tri
TriangleFace &tri = (*mp_MeshP->m_Faces)[ TriIndex ];
v0 = (*mp_MeshP->m_CollapsedMesh)[ tri.index[0] ].originalPosition;
v1 = (*mp_MeshP->m_CollapsedMesh)[ tri.index[1] ].originalPosition;
v2 = (*mp_MeshP->m_CollapsedMesh)[ tri.index[2] ].originalPosition;
bool value = mp_Ray.IntersectTriangle( v0, v1, v2, &st, &su, &sv );
if( value &&
st >= 0 &&
temp > st )//distance of this intersection is minimum, make min intersection this one
{
temp = st;
mp_T = st;
mp_U = su;
mp_V = sv;
mp_Intersected = true;
mp_TriIndex = TriIndex;
}
}
}
return mp_Intersected;
}
return false;
}
