buildMesh method

@override ShapeMesh buildMesh([ ShapeUv uv = ShapeUv.natural ])

Its triangles, textured by uv.

Implementation

@override
ShapeMesh buildMesh([ShapeUv uv = ShapeUv.natural]) {
  final r = Primitive3D.size(radius);
  final n = Primitive3D.count(rings, 2, 64);
  final b = MeshBuilder(uv)
    ..lathe(
      [
        for (var j = 0; j <= n; j++)
          (
            r * math.sin(math.pi * j / n),
            -r * math.cos(math.pi * j / n),
            math.sin(math.pi * j / n),
            -math.cos(math.pi * j / n),
            uv.anyway(r * math.pi * j / n),
          ),
      ],
      Primitive3D.count(segments, 3, 128),
      aroundLength: uv.around(r),
      profileLength: uv.anyway(r * math.pi),
    );
  final mesh = b.build();
  return smooth ? mesh : mesh.faceted();
}