x3d

目录

• 3d format introduction
• x3d resources
  • open source C++ implementations
• file formats
  • 1. Feature matrix of the 8 most popular 3D file formats
  • 2. Import/Export support in popular 3D modeling software and engines
  • x3d format
• FAQ

x3d

3d format introduction

https://all3dp.com/3d-file-format-3d-files-3d-printer-3d-cad-vrml-stl-obj/

x3d resources

https://www.web3d.org/x3d/content/examples/X3dResources.html

https://en.wikipedia.org/wiki/X3D

standard https://www.web3d.org/standards

open source C++ implementations

http://libx3d.sourceforge.net/

https://h3dapi.org/

file formats

OBJ, FBX, 3DS, PLY, STL, STL, OBJ, FBX, COLLADA, 3DS, IGES; STEP, and VRML/X3D.

3D file format	Type
STL	Neutral
OBJ	ASCII variant is neutral, binary variant is proprietary
FBX	Proprietary
COLLADA	Neutral
3DS	Proprietary
IGES	Neutral
STEP	Neutral
VRML/X3D	Neutral

1. Feature matrix of the 8 most popular 3D file formats

File format	Geometry	Appearance	Scene	Animation
	Approximate mesh	Precise mesh	CSG	Color	Material	Texture	Camera	Lights	Relative positioning
STL
OBJ
FBX
COLLADA
3DS
IGES
STEP
X3D

2. Import/Export support in popular 3D modeling software and engines

	STL	OBJ	FBX	COLLADA	3DS	IGES	STEP	VRML	X3D
Sketchup	No	Export	Export	Both	Both	None	No	Export	No
Solidworks	Both	Both	No	No	Both	Both	Both	Both	No
Fusion 360	Both	Import	Both	No	No	Both	Both	No	No
AutoCAD	No	No	Both	No	Import	Both	Import	No	No
Blender	Both	Both	Both	Both	Both	No	No	Both	Both
Rhino	Both	Both	Both	Export	Import	Import	Import	Both	Export
Cinema4D	Both	Both	Both	Both	Both	Import	No	Both	No
Unity	No	Import	Import	Import	Import	No	No	No	No

x3d format

General guideline

Coordinate system https://doc.x3dom.org/tutorials/basics/hello/index.html

Viewer

Unit

projection to 2D

Item	Desc
Basic Geometry shape, and its size	Model by Shape node
Position of object	Model by Transform node
Component, combination of basic shapes	Model by Group
Device attributes	Model by metadata?
3d profile	Model by ElevationGrid https://www.web3d.org/x3d/content/examples/Vrml2.0Sourcebook/Chapter14ElevationGrid/Figure14_2ElevationGridMountainIndex.html

Vision parts in x3d

Item	X3d
Die	Box
Circular pad	Cylinder
Wire	Extrusion? https://www.web3d.org/x3d/content/examples/Vrml2.0Sourcebook/Chapter15Extrusion/Figure15_11ExtrudedPlaygroundSlideIndex.html
half circle pad	Extrusion? https://www.web3d.org/x3d/content/examples/Vrml2.0Sourcebook/Chapter15Extrusion/Figure15_08ExtrudedHalfCylinderWithCapsIndex.html

Die

<Group DEF='Die'>
    <Transform translation="0 1 0">
        <Shape>
            <Box size="1 2 3"/>
        </Shape>
    </Transform>
</Group>

Circular Pad

<Group DEF='CircularPad'>
    <Transform translation="0 1 0">
        <Shape>
            <Cylinder height = "6" radius="2.0"/>
        </Shape>
    </Transform>
</Group>

Circle rectangle pad

??

FAQ

Q: does it support user defined node type? eg. Wire

A: Yes. But the data structure may not be what we expected

does a node support user defined attribute?