raycast method

@override void raycast(Raycaster raycaster, List<Intersection> intersects)

Get intersections between a casted ray and this Points. Raycaster.intersectObject will call this method.

Implementation

@override
void raycast(Raycaster raycaster, List<Intersection> intersects) {
  final geometry = this.geometry!;
  final matrixWorld = this.matrixWorld;
  final threshold = raycaster.params["Points"]['threshold'];
  final drawRange = geometry.drawRange;

  // Checking boundingSphere distance to ray

  if (geometry.boundingSphere == null) geometry.computeBoundingSphere();

  _pointssphere.setFrom(geometry.boundingSphere!);
  _pointssphere.applyMatrix4(matrixWorld);
  _pointssphere.radius += threshold;

  if (raycaster.ray.intersectsSphere(_pointssphere) == false) return;

  //

  _pointsinverseMatrix..setFrom(matrixWorld)..invert();
  _pointsray..copyFrom(raycaster.ray)..applyMatrix4(_pointsinverseMatrix);

  final localThreshold = threshold / ((scale.x + scale.y + scale.z) / 3);
  final localThresholdSq = localThreshold * localThreshold;

  final index = geometry.index;
  final attributes = geometry.attributes;
  final positionAttribute = attributes["position"];

  if (index != null) {
    final start = math.max(0, drawRange["start"]!);
    final end =
        math.min(index.count, (drawRange["start"]! + drawRange["count"]!));

    for (int i = start, il = end; i < il; i++) {
      final a = index.getX(i)!.toInt();

      _position.fromBuffer(positionAttribute, a.toInt());

      testPoint(_position, a, localThresholdSq, matrixWorld, raycaster,
          intersects, this);
    }
  } else {
    final start = math.max(0, drawRange["start"]!);
    final end = math.min<int>(
        positionAttribute.count, (drawRange["start"]! + drawRange["count"]!));

    for (int i = start, l = end; i < l; i++) {
      _position.fromBuffer(positionAttribute, i);

      testPoint(_position, i, localThresholdSq, matrixWorld, raycaster,
          intersects, this);
    }
  }
}