toNonIndexed method

BufferGeometry toNonIndexed()

Return a non-index version of an indexed BufferGeometry.

Implementation

BufferGeometry toNonIndexed() {
  Float32BufferAttribute convertBufferAttribute(BufferAttribute attribute, indices) {
    console.info("BufferGeometry.convertBufferAttribute todo");

    final array = attribute.array;
    final itemSize = attribute.itemSize;
    final normalized = attribute.normalized;

    final array2 = Float32List(indices.length * itemSize);

    int index = 0, index2 = 0;

    for (int i = 0, l = indices.length; i < l; i++) {
      if (attribute is InterleavedBufferAttribute) {
        index = indices[i] * attribute.data!.stride + attribute.offset;
      } else {
        index = indices[i] * itemSize;
      }

      for (int j = 0; j < itemSize; j++) {
        array2[index2++] = array[index++].toDouble();
      }
    }

    return Float32BufferAttribute.fromList(array2, itemSize, normalized);
  }

  //

  if (index == null) {
    console.info('BufferGeometry.toNonIndexed(): Geometry is already non-indexed.');
    return this;
  }

  final geometry2 = BufferGeometry();

  final indices = index!.array;
  final attributes = this.attributes;

  // attributes

  for (String name in attributes.keys) {
    final attribute = attributes[name];

    final newAttribute = convertBufferAttribute(attribute, indices);

    geometry2.setAttributeFromString(name, newAttribute);
  }

  // morph attributes

  final morphAttributes = this.morphAttributes;

  for (String name in morphAttributes.keys) {
    List<BufferAttribute> morphArray = [];
    List<BufferAttribute> morphAttribute = morphAttributes[name]!; // morphAttribute: array of Float32BufferAttributes

    for (int i = 0; i < morphAttribute.length; i++) {
      final attribute = morphAttribute[i];

      final newAttribute = convertBufferAttribute(attribute, indices);

      morphArray.add(newAttribute);
    }

    geometry2.morphAttributes[name] = morphArray;
  }

  geometry2.morphTargetsRelative = morphTargetsRelative;

  // groups

  List<Map<String,dynamic>> groups = this.groups;

  for (int i = 0, l = groups.length; i < l; i++) {
    final group = groups[i];
    geometry2.addGroup(group["start"], group["count"], group["materialIndex"]);
  }

  return geometry2;
}