@Override
  protected void processRoofEditPoints(final List<? extends ReadOnlyVector3> wallUpperPoints) {
    final ReadOnlyVector3 center = getCenter();
    if (recalculateEditPoints) {
      recalculateEditPoints = false;
      points.get(0).set(toRelative(center));
      // if (editPointIndex == -1) {
      recalculateEditPoints = false;
      points.add(toRelative(getCenter()));
      final Vector3 hipDirection =
          container.getAbsPoint(2).subtractLocal(container.getAbsPoint(0)).normalizeLocal();
      Vector3 point1 =
          findFarthestIntersection(
              wallUpperPoints, center, center.add(hipDirection.multiply(-1000, null), null));
      Vector3 point2 =
          findFarthestIntersection(
              wallUpperPoints, center, center.add(hipDirection.multiply(1000, null), null));
      if (point1 == null) point1 = center.clone();
      if (point2 == null) point2 = center.clone();

      point1.addLocal(hipDirection.multiply(point1.distance(center) * 0.5, null));
      point2.addLocal(hipDirection.multiply(-point2.distance(center) * 0.5, null));
      points.get(1).set(toRelative(point1));
      points.get(2).set(toRelative(point2));

      computeHeight(wallUpperPoints);
      applyHeight();
      // }
    } else {
      applyHeight();
    }
  }
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  /**
   * update position (using current position and velocity), color (interpolating between start and
   * end color), size (interpolating between start and end size), spin (using parent's spin speed)
   * and current age of particle. If this particle's age is greater than its lifespan, it is set to
   * status DEAD.
   *
   * <p>Note that this only changes the parameters of the Particle, not the geometry the particle is
   * associated with.
   *
   * @param secondsPassed number of seconds passed since last update.
   * @return true if this particle is not ALIVE (in other words, if it is ready to be reused.)
   */
  public boolean updateAndCheck(final double secondsPassed) {
    if (status != Status.Alive) {
      return true;
    }
    currentAge += secondsPassed * 1000; // add ms time to age
    if (currentAge > lifeSpan) {
      killParticle();
      return true;
    }

    final Vector3 temp = Vector3.fetchTempInstance();
    _position.addLocal(_velocity.multiply(secondsPassed * 1000f, temp));
    Vector3.releaseTempInstance(temp);

    // get interpolated values from appearance ramp:
    parent.getRamp().getValuesAtAge(currentAge, lifeSpan, currColor, values, parent);

    // interpolate colors
    final int verts = ParticleSystem.getVertsForParticleType(type);
    for (int x = 0; x < verts; x++) {
      BufferUtils.setInBuffer(
          currColor, parent.getParticleGeometry().getMeshData().getColorBuffer(), startIndex + x);
    }

    // check for tex animation
    final int newTexIndex = parent.getTexAnimation().getTexIndexAtAge(currentAge, lifeSpan, parent);
    // Update tex coords if applicable
    if (currentTexIndex != newTexIndex) {
      // Only supported in Quad type for now.
      if (ParticleType.Quad.equals(parent.getParticleType())) {
        // determine side
        final float side = (float) Math.sqrt(parent.getTexQuantity());
        int index = newTexIndex;
        if (index >= parent.getTexQuantity()) {
          index %= parent.getTexQuantity();
        }
        // figure row / col
        final float row = side - (int) (index / side) - 1;
        final float col = index % side;
        // set texcoords
        final float sU = col / side, eU = (col + 1) / side;
        final float sV = row / side, eV = (row + 1) / side;
        final FloatBuffer texs =
            parent.getParticleGeometry().getMeshData().getTextureCoords(0).getBuffer();
        texs.position(startIndex * 2);
        texs.put(eU).put(sV);
        texs.put(eU).put(eV);
        texs.put(sU).put(eV);
        texs.put(sU).put(sV);
        texs.clear();
      }
      currentTexIndex = newTexIndex;
    }

    return false;
  }