Wireframe: the source

since 0.1.0 or earlier Shading and materials
Open the live demo · Read the guide · View on GitHub
Regions the guide quotes: mesh (line 24), settings (line 42), check (line 56).
1/// `RenderSettings.wireframe`: triangles drawn as lines, and what a device
2/// that cannot do that reports instead.
3///
4/// Quoted by `wireframe.md` and shown whole in the Source tab.
5library;

7import 'package:flutter3d/flutter3d.dart';
8import 'package:flutter3d_showcase/src/demo/demo.dart';
9import 'package:vector_math/vector_math.dart';

11final class WireframeDemo extends ShowcaseDemo {
bool wireframe = true;

@override
void configureView(DemoContext context) {
  context.orbit
    ..distance = 4.5
    ..yaw = 0.5
    ..pitch = 0.25;
}

@override
Scene build(DemoContext context) {
  final MeshNode knot = MeshNode(
    DeviceMesh.upload(
      context.device,
      const TorusShape(segments: 32, tubeSegments: 16).build(),
    ),
    Material(name: 'knot', baseColor: Vector4(0.3, 0.65, 0.85, 1.0)),
    name: 'knot',
  );
  return Scene()
    ..add(knot)
    ..add(
      LightNode(name: 'sun', intensity: 3.0)
        ..setLocalForward(Vector3(-0.4, -0.7, -0.6)),
    );
}

@override
RenderSettings settings(DemoContext context) => RenderSettings(
  wireframe: wireframe,
);

@override
List<DemoControl> controls(DemoContext context) => <DemoControl>[
  ToggleControl(
    'Wireframe',
    value: () => wireframe,
    onChanged: (bool v) => wireframe = v,
  ),
];

@override
void verify(Scene scene, FrameResult frame) {
  // The software rasteriser has no polygon-mode line primitive, so this
  // page's own claim on this device is the refusal itself: asking for
  // wireframe here still draws the model solid, and the frame says why.
  if (wireframe && !frame.wireframeDeclined) {
    throw StateError('this device drew wireframe; the claim below is stale');
  }
  if (frame.drawCalls < 1) {
    throw StateError('the knot was not drawn');
  }
}
66}