problem with normals Catmull clark
hi i was trying to implement the catmull clark subdivision. i am having trouble in calculating the normals. i calculate the normals based on tangent vectors , but i am not getting it rt.i am using a cube with 6 faces, each having a valence of 3 intially. below is the sample of my code
----------------------
while(currFace!=NULL)
{
currEdge = currFace->edge;
do
{
currVert = currEdge->vert;
valence = currVert->valence;
tu[0] = 0.0f; tu[1] = 0.0f; tu[2] = 0.0f;
tv[0] = 0.0f; tv[1] = 0.0f; tv[2] = 0.0f;
normal[0] = 0.0f; normal[1] = 0.0f; normal[2] = 0.0f;
currVert->edge = currEdge;
valence = currVert->valence;
An = 1 + cos(twoPi/valence) + cos(PI/valence)*(sqrt(2*(9+cos(2*PI/valence))));
do
{
nextSymmEdge = currEdge->next->symm;
cosF = (cos((twoPi*i)/valence) +cos((twoPi*(i+1))/valence));
f1x = currEdge->face->faceCenter->x; f1y = currEdge->face->faceCenter->y; f1z = currEdge->face->faceCenter->z;
f2x = nextSymmEdge->face->faceCenter->x; f2y = nextSymmEdge->face->faceCenter->y; f2z = nextSymmEdge->face->faceCenter->z;
tu[0]+= (An*cos(((twoPi*i)/valence)*currEdge->midVertex->x + cosF*f1x));
tu[1]+= (An*cos(((twoPi*i)/valence)*currEdge->midVertex->y + cosF*f1y));
tu[2]+= (An*cos(((twoPi*i)/valence)*currEdge->midVertex->z + cosF*f1z));
tv[0]+= (An*cos(((twoPi*i)/valence)*nextSymmEdge->midVertex->x + cosF*f2x));
tv[1]+= (An*cos(((twoPi*i)/valence)*nextSymmEdge->midVertex->y + cosF*f2y));
tv[2]+= (An*cos(((twoPi*i)/valence)*nextSymmEdge->midVertex->z + cosF*f2z));
i++;
currEdge = nextSymmEdge;
}while(currEdge!=currVert->edge);
normal = norm(cross(tu,tv));
currEdge->vert->normal = normal;
i=0;
----------------------------------
if anyone knows whats wrong with this pls tell me. sometimes my cube becomes bright and sometimes very dark as i rotate it.
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