Function ComputeCenterPointOnFace

Descent3/room.cpp:774–784

Computes the center point on a face by averaging the points in the face

// Computes the center point on a face by averaging the points in the face
void ComputeCenterPointOnFace(vector *vp, room *rp, int facenum) {
  face *fp = &rp->faces[facenum];
  int i;

  vp->x = vp->y = vp->z = 0;

  for (i = 0; i < fp->num_verts; i++)
    *vp += rp->verts[fp->face_verts[i]];

  *vp /= fp->num_verts;
}

// the minimum magnitude of a surface normal that we're willing to accept
#define MIN_NORMAL_MAG 0.035