// Slow method to do object-ray intersection ..
bool Pawn::test_intersect(ray3D& ray)
{
vector<vec3> verts;
pawnObj.getVertices(verts);
vector<vec3> normals;
pawnObj.getVertexNormals(normals);
vector<uvec3> elements;
pawnObj.getElements(elements);
vec3 minBB, maxBB;
pawnObj.boundingBox(minBB, maxBB);
vector<vec3> vertices_tr(3);
vector<vec3> normals_tr(3);
if(rayBoxIntersection(ray, minBB, maxBB))
{
for(int i = 0; i < elements.size(); i++)
{
vertices_tr[0] = verts[elements[i].x];
vertices_tr[1] = verts[elements[i].y];
vertices_tr[2] = verts[elements[i].z];
normals_tr[0] = normals[elements[i].x];
normals_tr[1] = normals[elements[i].y];
normals_tr[2] = normals[elements[i].z];
rayTriangleIntersection(ray, vertices_tr, normals_tr);
}
}
return(!ray.intersection.none);
}
void fiberForwardModel( float fiber[3][MAX_FIB_LEN], unsigned int pts )
{
static Vector<double> S1, S2, S1m, S2m, P;
static Vector<double> vox, vmin, vmax, dir;
static double len, t;
static int i, j, k;
FiberSegments.clear();
for(i=nPointsToSkip; i<pts-1-nPointsToSkip ;i++)
{
// original segment to be processed
S1.Set( fiber[0][i] + fiberShiftXmm, fiber[1][i] + fiberShiftYmm, fiber[2][i] + fiberShiftZmm );
S2.Set( fiber[0][i+1] + fiberShiftXmm, fiber[1][i+1] + fiberShiftYmm, fiber[2][i+1] + fiberShiftZmm );
// get a normal to the vector to move
dir.x = S2.x-S1.x;
dir.y = S2.y-S1.y;
dir.z = S2.z-S1.z;
dir.Normalize();
if ( doIntersect==false )
segmentForwardModel( S1, S2 );
else
while( 1 )
{
len = sqrt( pow(S2.x-S1.x,2) + pow(S2.y-S1.y,2) + pow(S2.z-S1.z,2) ); // in mm
if ( len <= minSegLen )
break;
// compute AABB of the first point (in mm)
vmin.x = floor( (S1.x + 1e-6*dir.x)/pixdim.x ) * pixdim.x;
vmin.y = floor( (S1.y + 1e-6*dir.y)/pixdim.y ) * pixdim.y;
vmin.z = floor( (S1.z + 1e-6*dir.z)/pixdim.z ) * pixdim.z;
vmax.x = vmin.x + pixdim.x;
vmax.y = vmin.y + pixdim.y;
vmax.z = vmin.z + pixdim.z;
if ( rayBoxIntersection( S1, dir, vmin, vmax, t ) && t>0 && t<len )
{
// add the portion S1P, and then reiterate
P.Set( S1.x + t*dir.x, S1.y + t*dir.y, S1.z + t*dir.z );
segmentForwardModel( S1, P );
S1.Set( P.x, P.y, P.z );
}
else
{
// add the segment S1S2 and stop iterating
segmentForwardModel( S1, S2 );
break;
}
}
}
}
void Octree::traverseOctree(BoundingBox** Box, Ray ray)
{
if ( (*Box) == NULL )
return;
//ray box intersection (if ray does not intersect box, return)
clock_t start2, finish2;
start2 = clock();
bool rayBox = rayBoxIntersection(**Box, ray);
finish2 = clock();
traverse_time2 += (finish2-start2) / (double)CLOCKS_PER_SEC;
//if ( !rayBoxIntersection(**Box, ray) )
if ( !rayBox )
{
return;
}
if ( (*Box)->childBoxes[0] == NULL ) //then this is a leaf node
{
//numObjectsToSendBack += (*Box)->numObjects;
//add to the pot (if the object isn't tagged as already been added)
for (int i=0; i < (*Box)->Storage.size(); i++)
{
if ( !((*Box)->Storage[i]->beenChecked) )
{
objectsToSendBack.push_back( (*Box)->Storage[i] );
(*Box)->Storage[i]->beenChecked = true;
}
}
return;
}
for (int i=0; i < 8; i++)
{
traverseOctree(&((*Box)->childBoxes[i]),ray);
}
}
