Function RenderFloatingTrig

Descent3/render.cpp:1198–1238

#define STEPSIZE .01f
#define STEPSIZE_MIN .1f
void RenderFloatingTrig(room *rp, face *fp) {
  if (!Render_floating_triggers)
    return;
  vector leftvec, rightvec;
  vector left, right;
  vector left_step, right_step;
  int n_steps, i, j;
  g3Point p3;
  float stepsize;
  left = rp->verts[fp->face_verts[0]];
  right = rp->verts[fp->face_verts[1]];
  g3_RotatePoint(&p3, &left);
  stepsize = STEPSIZE * p3.p3_z;
  if (stepsize < STEPSIZE_MIN)
    stepsize = STEPSIZE_MIN;
  leftvec = rp->verts[fp->face_verts[3]] - rp->verts[fp->face_verts[0]];
  rightvec = rp->verts[fp->face_verts[2]] - rp->verts[fp->face_verts[1]];
  n_steps = (vm_GetMagnitude(&leftvec) / stepsize + 0.5) + 1;
  left_step = leftvec / n_steps;
  right_step = rightvec / n_steps;
  for (i = 0; i < n_steps; i++) {
    vector p;
    g3Point p3;
    vector crossvec, cross_step;
    int n_crosssteps;

    crossvec = right - left;
    n_crosssteps = (vm_GetMagnitude(&crossvec) / stepsize + 0.5) + 1;
    cross_step = crossvec / n_steps;
    p = left;
    for (j = 0; j < n_crosssteps; j++) {
      if (g3_RotatePoint(&p3, &p) == 0) { // on screen
        g3_ProjectPoint(&p3);
        rend_SetPixel(GR_RGB(255, 100, 100), p3.p3_sx, p3.p3_sy);
      }
      p += cross_step;
    }
    left += left_step;
    right += right_step;
  }
}
#endif // ifdef EDITOR
void RenderSpecularFaces(room *rp) {
  ASSERT(Num_specular_faces_to_render > 0);