/**
* Recalculate the vertex normal, by averagin the normals of the neighboring triangles. The
* neighbor list holds only triangles that we want to average with this vertex.
*
* @see GL_Object.registerNeighbors()
* @param neighbors neighboring triangles for this vert
* @return vertex normal
*/
public GL_Vector recalcVertexNormal(ArrayList neighbors) {
float nx = 0;
float ny = 0;
float nz = 0;
GL_Triangle tri;
GL_Vector wn = new GL_Vector();
// for each neighbor triangle, average the normals
for (int i = 0; i < neighbors.size(); i++) {
tri = (GL_Triangle) neighbors.get(i);
wn = tri.getWeightedNormal();
nx += wn.x;
ny += wn.y;
nz += wn.z;
}
GL_Vector vertn = new GL_Vector(nx, ny, nz);
vertn.normalize();
return vertn;
}
