raycast method

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

Implementation

@override
void raycast(Raycaster raycaster, List<Intersection> intersects) {
  // print(" raycast: ${this.name} ${this} ");

  var geometry = this.geometry!;
  var material = this.material;
  var matrixWorld = this.matrixWorld;

  if (material == null) return;

  // Checking boundingSphere distance to ray

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

  _meshsphere.copy(geometry.boundingSphere!);
  _meshsphere.applyMatrix4(matrixWorld);

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

  _meshinverseMatrix.copy(matrixWorld).invert();
  _meshray.copy(raycaster.ray).applyMatrix4(_meshinverseMatrix);

  // Check boundingBox before continuing

  if (geometry.boundingBox != null) {
    if (_meshray.intersectsBox(geometry.boundingBox!) == false) return;
  }

  Intersection? intersection;
  var index = geometry.index;
  var position = geometry.attributes["position"];
  var morphPosition = geometry.morphAttributes["position"];
  var morphTargetsRelative = geometry.morphTargetsRelative;
  var uv = geometry.attributes["uv"];
  var uv2 = geometry.attributes["uv2"];
  var groups = geometry.groups;
  var drawRange = geometry.drawRange;

  if (index != null) {
    // indexed buffer geometry

    if (material is List) {
      for (var i = 0, il = groups.length; i < il; i++) {
        var group = groups[i];
        var groupMaterial = material[group["materialIndex"]];

        var start = Math.max<int>(group["start"], drawRange["start"]!);
        var end = Math.min<int>((group["start"] + group["count"]), (drawRange["start"]! + drawRange["count"]!));

        for (var j = start, jl = end; j < jl; j += 3) {
          int a = index.getX(j)!.toInt();
          int b = index.getX(j + 1)!.toInt();
          int c = index.getX(j + 2)!.toInt();

          intersection = checkBufferGeometryIntersection(this, groupMaterial, raycaster, _meshray, position,
              morphPosition, morphTargetsRelative, uv, uv2, a, b, c);

          if (intersection != null) {
            intersection.faceIndex = Math.floor(j / 3);
            // triangle number in indexed buffer semantics
            intersection.face?.materialIndex = group["materialIndex"];
            intersects.add(intersection);
          }
        }
      }
    } else {
      var start = Math.max(0, drawRange["start"]!);
      var end = Math.min(index.count, (drawRange["start"]! + drawRange["count"]!));

      for (var i = start, il = end; i < il; i += 3) {
        int a = index.getX(i)!.toInt();
        int b = index.getX(i + 1)!.toInt();
        int c = index.getX(i + 2)!.toInt();

        intersection = checkBufferGeometryIntersection(
            this, material, raycaster, _meshray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c);

        if (intersection != null) {
          intersection.faceIndex = Math.floor(i / 3);
          // triangle number in indexed buffer semantics
          intersects.add(intersection);
        }
      }
    }
  } else if (position != null) {
    // non-indexed buffer geometry

    if (material is List) {
      for (var i = 0, il = groups.length; i < il; i++) {
        var group = groups[i];
        var groupMaterial = material[group["materialIndex"]];

        var start = Math.max<int>(group["start"], drawRange["start"]!);
        var end = Math.min<int>((group["start"] + group["count"]), (drawRange["start"]! + drawRange["count"]!));

        for (var j = start, jl = end; j < jl; j += 3) {
          var a = j;
          var b = j + 1;
          var c = j + 2;

          intersection = checkBufferGeometryIntersection(this, groupMaterial, raycaster, _meshray, position,
              morphPosition, morphTargetsRelative, uv, uv2, a, b, c);

          if (intersection != null) {
            intersection.faceIndex = Math.floor(j / 3);
            // triangle number in non-indexed buffer semantics
            intersection.face?.materialIndex = group["materialIndex"];
            intersects.add(intersection);
          }
        }
      }
    } else {
      var start = Math.max(0, drawRange["start"]!);
      var end = Math.min<int>(position.count, (drawRange["start"]! + drawRange["count"]!));

      for (var i = start, il = end; i < il; i += 3) {
        var a = i;
        var b = i + 1;
        var c = i + 2;

        intersection = checkBufferGeometryIntersection(
            this, material, raycaster, _meshray, position, morphPosition, morphTargetsRelative, uv, uv2, a, b, c);

        if (intersection != null) {
          intersection.faceIndex = Math.floor(i / 3); // triangle number in non-indexed buffer semantics
          intersects.add(intersection);
        }
      }
    }
  }
}