GeometryBuilder class Geometry

Assembles a MeshGeometry one vertex and triangle at a time.

The attribute setters (normal, texCoord, texCoord1, color, and tangent) 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 setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
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, GeometryBufferArena? bufferArena, bool retainCpuData = true}) → 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.
tangent(Vector4 value) → GeometryBuilder
Sets the tangent applied to vertices added after this call.
texCoord(Vector2 value) → GeometryBuilder
Sets the texture coordinate applied to vertices added after this call.
texCoord1(Vector2 value) → GeometryBuilder
Sets the secondary texture coordinate for subsequent vertices.
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited