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Description:

ditredi

DiTreDi (D 3D) #
A flutter package that displays large 3D datasets on a transparent canvas.
Live web example
Example source code
Preface #
DiTreDi was created to efficiently display datasets and meshes in 3D space. It wasn't intended to create a 3D game engine and is rather useful for displaying static meshes.
Table of Contents #

DiTreDi (D 3D)

Preface
Table of Contents
Getting started
Controller
Config
Shapes

Cube3D
Face3D
Group3D
Line3D
Mesh3D
Plane3D
Point3D
PointPlane3D

Transformations

Points and wireframes
Matrix transformation

Benchmarks

Getting started #
Install package.
Add imports for ditredi and vector_math_64:
import 'package:ditredi/ditredi.dart';
import 'package:vector_math/vector_math_64.dart';
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Add DiTreDi widget to your tree:
DiTreDi(
figures: [
Cube3D(2, Vector3(0, 0, 0)),
],
)
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And voilà, a single cube will be displayed:

Note: DiTreDi takes full available size. Wrap in SizedBox or Expanded to control its constraints and size.

Controller #
DiTreDiController controls a scene rotation, scale, light.
To set up a controller, keep its reference in a state and pass to the controller parameter.
// in a state
@override
void initState() {
super.initState();
controller = DiTreDiController();
}

DiTreDi(
figures: [
Cube3D(2, Vector3(0, 0, 0)),
],
controller: controller,
)
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Once ready, update controller state by calling:
controller.update(rotationY: 30, rotationX: 30);
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To handle input gestures use GestureDetector, DiTreDiDraggable, or DiTreDiAlternativeDraggable:
// stable camera, view clamping
DiTreDiDraggable(
controller: controller,
child: DiTreDi(
figures: [Cube3D(1, vector.Vector3(0, 0, 0))],
controller: controller,
),
);
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// dyanmic camera, no clamping
DiTreDiAlternativeDraggable(
controller: controller,
child: DiTreDi(
figures: [Cube3D(1, vector.Vector3(0, 0, 0))],
controller: controller,
),
);
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Config #
DiTreDiConfig defines component "defaults" - mesh color, lines and points width (if not specified).
// in a state

DiTreDi(
figures: [
Cube3D(2, Vector3(0, 0, 0)),
],
config: DiTreDiConfig(
supportZIndex: false,
),
)
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If a huge dataset is displayed and you don't bother about paint order, it's recommended to disable z-index which boosts drawing speed (supportZIndex = false).
Shapes #
DiTreDi out-of-the-box supports shapes like:
Cube3D #
Just a cube.
DiTreDi(
figures: [
Cube3D(2, Vector3(0, 0, 0)),
],
)
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Face3D #
Face (aka triangle).
DiTreDi(
figures: [
Face3D(
Triangle.points(
Vector3(0, 0 - 1, 0 - 1),
Vector3(0, 0 - 1, 0 + 1),
Vector3(0, 0 + 1, 0 + 1),
),
),
],
)
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Group3D #
Groups a list of figures.
DiTreDi(
figures: [
Group3D([
Cube3D(1, Vector3(0, 0, 0)),
Cube3D(1, Vector3(3, 3, 3)),
]),
],
)
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An alternative method to display multiple shapes, it to put a few figures:
DiTreDi(
figures: [
Cube3D(1, Vector3(0, 0, 0)),
Cube3D(1, Vector3(-3, 0, 0)),
Cube3D(1, Vector3(3, 0, 0)),
Cube3D(1, Vector3(0, -3, 0)),
Cube3D(1, Vector3(0, 3, 0)),
Cube3D(1, Vector3(0, 0, -3)),
Cube3D(1, Vector3(0, 0, 3)),
],
)
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Line3D #
A line.
DiTreDi(
figures: [
Line3D(Vector3(0, 1, 0), Vector3(2, 1, 4), width: 8),
Line3D(Vector3(0, 2, 0), Vector3(2, 2, 4), width: 6),
Line3D(Vector3(0, 3, 0), Vector3(2, 3, 4), width: 4),
Line3D(Vector3(0, 4, 0), Vector3(2, 4, 4), width: 2),
Line3D(Vector3(0, 5, 0), Vector3(2, 5, 4), width: 1),
],
)
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Mesh3D #
A mesh made of faces (triangles).
You could use ObjParser to load it from .obj file contents.
Currently, only material (mtl) as colours are supported.
Load from a string obj content:
DiTreDi(
figures: [
Mesh3D(await ObjParser().parse(meshLines)),
],
)
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Load from a flutter resource:
DiTreDi(
figures: [
Mesh3D(await ObjParser().loadFromResources("assets/model.obj")),
],
)
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Load from a file:
DiTreDi(
figures: [
Mesh3D(await ObjParser().loadFromFile(Uri.parse("files/model.obj"))),
],
)
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Plane3D #
A plane facing x (left/right), y (bottom/up) or z (near/far) axis.
DiTreDi(
figures: [
Plane3D(5, Axis3D.y, false, Vector3(0, 0, 0), color: Colors.green),
],
)
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Point3D #
A point (exactly a square).
DiTreDi(
figures: [
Plane3D(5, Axis3D.y, false, Vector3(0, 0, 0), color: Colors.green),
],
)
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PointPlane3D #
A plane made of points (e.g. to show an object) scale.
DiTreDi(
figures: [
PointPlane3D(1, Axis3D.y, 0.1, Vector3(0, 0, 0), pointWidth: 5),
Cube3D(0.1, Vector3(0, 0, 0)),
],
)
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Transformations #
Points and wireframes #
Each figure could be changed to points or lines (wireframe).
DiTreDi(
figures: [
...Plane3D(5, Axis3D.z, false, Vector3(0, 0, 0)).toPoints(),
],
)
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DiTreDi(
figures: [
...Plane3D(5, Axis3D.z, false, Vector3(0, 0, 0)).toLines(),
],
)
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Matrix transformation #
Figures might be rotated, translated, and scaled with TransformModifier3D and Matrix4.
Each transformation is made for 0,0,0 coordinates.
DiTreDi(
figures: [
TransformModifier3D(
Cube3D(2, Vector3(1, 1, 1)),
Matrix4.identity()
..setRotationX(10)
..setRotationY(10)
..setRotationZ(10)),
],
)
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To rotate the figure around its "own" position, you must translate, rotate and translate back.
DiTreDi(
figures: [
Cube3D(2, Vector3(0, 0, 0)),
TransformModifier3D(
Cube3D(2, Vector3(2, 2, 2)),
Matrix4.identity()
..translate(2.0, 2.0, 2.0)
..rotateZ(10)
..rotateX(10)
..translate(-2.0, -2.0, -2.0)),
],
)
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Transform Group3D to apply a matrix to each figure.
DiTreDi(
figures: [
Cube3D(2, Vector3(0, 0, 0)),
TransformModifier3D(
Group3D([
Cube3D(2, Vector3(2, 2, 2)),
Cube3D(2, Vector3(4, 4, 4)),
]),
transformation,
),
],
)
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Benchmarks #
TBD