Ambient occlusion: the source

since 0.2.0 Post-processing

Open the live demo · Read the guide · View on GitHub

Regions the guide quotes: ambient (line 21), settings (line 28), ran (line 57).

1/// Ambient occlusion: the ambient term darkened wherever a surface cannot see
2/// much of the sky.
3///
4/// Quoted by `ambient_occlusion.md` and shown whole in the Source tab.
5library;

7import 'package:flutter3d/flutter3d.dart';
8import 'package:flutter3d_showcase/pages/post/post_stage.dart';
9import 'package:flutter3d_showcase/src/demo/demo.dart';

11final class AmbientOcclusionDemo extends ShowcaseDemo {
double strength = 0.9;
int blurTaps = 0;

@override
void configureView(DemoContext context) =>
    PostStage.frame(context, distance: 6.0);

@override
Scene build(DemoContext context) {
  final Scene scene = PostStage.build(context).scene;
  scene.ambientIntensity = 0.6;
  return scene;
}

@override
RenderSettings settings(DemoContext context) => RenderSettings(
  ambientOcclusion: AmbientOcclusionSettings(
    enabled: true,
    strength: strength,
    blurTaps: blurTaps,
  ),
);

@override
List<DemoControl> controls(DemoContext context) => <DemoControl>[
  SliderControl(
    'Strength',
    min: 0,
    max: 1,
    value: () => strength,
    onChanged: (double v) => strength = v,
  ),
  SliderControl(
    'Blur taps',
    min: 0,
    max: 8,
    divisions: 8,
    value: () => blurTaps.toDouble(),
    onChanged: (double v) => blurTaps = v.round(),
    format: (double v) => '${v.round()}',
  ),
];

@override
void verify(Scene scene, FrameResult frame) {
  if (!passRan(frame, 'ssao')) {
    throw StateError('the ssao pass did not run: ${frame.skipped}');
  }
  if (blurTaps > 0 && !passRan(frame, 'ssao blur')) {
    throw StateError(
      'blur taps were asked for and the blur pass did not run',
    );
  }
}
66}