GeometryBuilder class

Assembles a MeshGeometry one vertex and triangle at a time.

The attribute setters (normal, texCoord, color) are sticky: each value applies to every addVertex call that follows until it is changed. addVertex returns the index of the added vertex; when deduplicate is set, a vertex equal to one already added is merged and the existing index is returned instead.

final geometry = (GeometryBuilder()
      ..color(Vector4(1, 0, 0, 1))
      ..addVertex(Vector3(0, 0, 0))
      ..addVertex(Vector3(1, 0, 0))
      ..addVertex(Vector3(0, 1, 0))
      ..addTriangle(0, 1, 2))
    .build();

Constructors

GeometryBuilder({bool deduplicate = true})

Creates an empty builder.

Properties

deduplicate → bool

Whether addVertex merges a vertex equal to one already added.

final

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

triangleCount → int

The number of triangles added so far.

no setter

vertexCount → int

The number of vertices added so far.

no setter

Methods

addTriangle(int a, int b, int c) → GeometryBuilder

Adds a triangle referencing three previously added vertex indices.

addVertex(Vector3 position) → int

Adds a vertex at position carrying the current sticky attributes and returns its index.

build({GeometryStorage storage = GeometryStorage.fixed}) → MeshGeometry

Builds and GPU-uploads the accumulated mesh.

color(Vector4 value) → GeometryBuilder

Sets the color applied to vertices added after this call.

normal(Vector3 value) → GeometryBuilder

Sets the normal applied to vertices added after this call.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

packVertices() → Uint8List

Packs the accumulated vertices into the interleaved layout.

texCoord(Vector2 value) → GeometryBuilder

Sets the texture coordinate applied to vertices added after this call.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited