MeshData constructor

Implementation

MeshData({
  required this.layout,
  required this.vertices,
  required this.indices,
  List<MorphTarget> morphTargets = const <MorphTarget>[],
}) : morphTargets = List<MorphTarget>.unmodifiable(morphTargets) {
  final stride = layout.floatsPerVertex;
  if (vertices.length % stride != 0) {
    throw ArgumentError(
      'vertices length (${vertices.length}) is not a multiple of the vertex '
      'size ($stride floats); layout and data disagree.',
    );
  }
  if (indices.length % 3 != 0) {
    throw ArgumentError(
      'indices length (${indices.length}) is not a multiple of 3, so these '
      'are not triangles.',
    );
  }
  for (final target in this.morphTargets) {
    if (target.vertexCount != vertexCount) {
      throw ArgumentError(
        'a morph target covers ${target.vertexCount} vertices and the mesh '
        'has $vertexCount. A target that does not cover the mesh would '
        'blend part of it and leave the rest where it was, which draws as a '
        'model torn in half.',
      );
    }
  }
}