simple_3d

(en)Japanese ver is here.
(ja)この解説の日本語版はここにあります。

Overview

This package is a working Flutter(Dart) implementation of Simple 3D Format.
Simple 3D Format is a file format that makes it easy for non-experts to handle 3D objects.
The file output in this format has the extension .sp3d, and the inner class convert to JSON. All the data about one object is contained in one file.
This specification aims to minimize complexity, make it easier to read in a text editor, and make it versatile.
Made for science, it can be difficult to use in other genres. For the development of science, I aim to be able to use it without being affected by interests and conflicts.

Usage

Quick Start

I created a package for rendering Sp3dObj.
You can use it more easily by using the following packages.
See the simple_3d_renderer package for how to use it.

simple_3d_renderer
util_simple_3d

Create Data

final sp3dObj = Sp3dObj(
    [Sp3dV3D(0, 0, 0)],
    [
      Sp3dFragment(
          [
            Sp3dFace([0], 0)
          ],
          isParticle: true,
          r: 1)
    ],
    [
      Sp3dMaterial(
        Color.fromARGB(255, 0, 255, 0),
        true,
        1,
        Color.fromARGB(255, 0, 255, 0),
      )
    ],
    []);

Operation example

// Move
sp3dObj.move(Sp3dV3D(1,0,0));
// Rotate
sp3dObj.rotate(Sp3dV3D(0,1,0),45*pi/180);
// Vertex manipulation
// You can do many other things with the Sp3dV3D feature.
sp3dObj.vertices[0] += Sp3dV3D(1,0,0);

Convert

final sp3dObjDict = sp3dObj.toDict();

Load

final restored = Sp3dObj.fromDict(sp3dObjDict);

Support

If you need paid support, please contact my company.
SimpleAppli Inc.

Format Name

Simple 3D Format

Filename Extension

.sp3d

MIME Type ( Temporary )

model/x.sp3d

Suitable

Science(For example, physical calculation), Simple Games, etc.

Not Suitable

Advanced graphics.

Structure ( Decoded object )

  • Sp3dObj
    • vertices: List
      • v: Sp3dV3D
    • fragments: List
      • fragment: Sp3dFragment
        • faces: List, The definition of the face. Represents a triangular or square mesh.
          • face: Sp3dFace
            • vertexIndexList: List, Vertices index. Counterclockwise rotation from the upper left.
              • index: int
            • materialIndex: int?
        • isParticle: bool.
        • r: double, Radius for particle type.
        • physics: Sp3dPhysics?
        • option: Map<String, dynamic>?, Optional attributes that may be added for each app. However, only parameters that can be converted to JSON can be entered.
    • materials: List
      • material: Sp3dMaterial
        • bg: Color, argb.
        • isFill: bool, if false, stroke line only.
        • strokeWidth: double
        • strokeColor: Color, argb
        • imageIndex: int?, Fills the face with the specified image, which is not null.
        • textureCoordinates: List?, Cutout coordinates when you want to use a part of the image. 3 or 6 points(In the case of a square, specify it with two triangles).
        • option: Map<String, dynamic>?, Optional attributes that may be added for each app. However, only parameters that can be converted to JSON can be entered.
    • images: list
      • image: Uint8List, png data.
    • id: String?
    • name: String?
    • author: String?
    • physics: Sp3dPhysics?
      • mass: double?, (kg). However, the unit should be changed for the calculation of atoms etc.
      • speed: double?, (m/s). However, the unit should be changed for the calculation of atoms etc.
      • direction: Sp3dV3D?, Unit vector.
      • velocity: Sp3dV3D?, Use for move.
      • rotateAxis: Sp3dV3D?
      • angularVelocity: double?, (rad/s).
      • angle: double?, rad.
      • others: Map<String, dynamic>?, If you want to use other parameters, add here To do.
    • option: Map<String, dynamic>?, Optional attributes that may be added for each app. However, only parameters that can be converted to JSON can be entered.

Parameter Note

If you use Sp3dObj to calculate a large number of atoms, consider using the isParticle flag and r(radius).
Each atom has one vertex when calculated or saved, and you can draw a sphere using UtilSp3dGeometry etc. only when drawing on the screen.
(That is, create a new Sp3dObj when drawing).

About version control

It is as follows in version 3.1.0 or later.
The C part will be changed at the time of version upgrade.

  • Changes such as adding variables, structure change that cause problems when reading previous files.
    • C.X.X
  • Adding methods, etc.
    • X.C.X
  • Minor changes and bug fixes.
    • X.X.C

License

This software is released under the MIT License, see LICENSE file.

Copyright notice

The “Dart” name and “Flutter” name are trademarks of Google LLC.
*The developer of this package is not Google LLC.

Libraries

simple_3d