Function DeleteVert

editor/HRoom.cpp:3018–3055

Deletes a vertex from an face Only deletes if the two adjacent edges are colinear, and there isn't a T-joint at this point

// Deletes a vertex from an face
// Only deletes if the two adjacent edges are colinear, and there isn't a T-joint at this point
void DeleteVert(room *rp, int facenum, int vertnum) {
  face *fp = &rp->faces[facenum];
  vector normal;
  float mag;
  int f0, f1;
  int prev_vertnum = (vertnum + fp->num_verts - 1) % fp->num_verts;

  mag = vm_GetNormal(&normal, &rp->verts[fp->face_verts[prev_vertnum]], &rp->verts[fp->face_verts[vertnum]],
                     &rp->verts[fp->face_verts[(vertnum + 1) % fp->num_verts]]);

  if (mag >= MIN_NORMAL_MAG) {
    OutrageMessageBox("Can't remove point: edges aren't colinear.");
    return;
  }

  // Make sure there isn't a t-joint at this face
  f0 = FindConnectedFace(rp, facenum, prev_vertnum, 0);
  f1 = FindConnectedFace(rp, facenum, vertnum, 0);
  if ((f0 != -1) && (f1 != -1) && (f0 != f1)) {
    OutrageMessageBox("Can't delete vertex: apparent T-joint with faces %d & %d\n", f0, f1);
    return;
  }

  // Delete the point on our passed face
  DeletePointFromFace(rp, facenum, vertnum);

  // Delete the point on the connected face
  face *fp2 = &rp->faces[f0];
  for (int v2 = 0; v2 < fp2->num_verts; v2++)
    if (fp2->face_verts[v2] == fp->face_verts[vertnum])
      break;
  ASSERT(v2 < fp2->num_verts);
  DeletePointFromFace(rp, f0, v2);

#ifndef NEWEDITOR
  World_changed = 1;
#endif
}

// Moves a vertex along its two adjacent edges
// Only moves if the two adjacent edges are colinear