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I3D Format

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Table of Contents

1. Introduction
2. Features
3. Overview
4. Specification
   1. General Layout
   2. Materials
   3. Shapes
   4. Dynamics
   5. Scenegraph
   6. Animation

Introduction

I3D is an eXtensible Markup Language (XML) file format.

A vaild I3D file has upwardly to seven parts: Textures, Materials, Shapes, Dynamics, Scene graph, Animation and Userdata. Dependent on application each part can be omitted.

The XML Schema language is used to draw the I3D feature set. Download: I3D 1.6 Schema

Features

• Scenegraph bureaucracy with
  • TransformGroups/Basic: translation, rotation, scale and visibility
  • Lights: ambient, point, directional and spot lights
  • Cameras: field of view, most and far clipping plane
  • Shapes: meshes and nurbs curves (supports geometry instancing)
  • Particle Systems
• Animation
  • Animation sets
  • Clips
  • Keyframes: translation, rotation, scale and visibility
  • Morph Targets
• User Attributes
• Dynamics
  • Particle Systems (Sprite based)
    • Surface Emitter
    • Gravity Fields
    • Air Fields
• Meshes
  • Vertices
  • Normals
  • Vertex colors
  • Pare weights
  • Texture coordinates (including multiple uv sets)
  • Faces (vertex color, normals and texture coordinates per confront)
• Curves
  • Nurbscurves
• Shader/Materials
  • Multitextures (capricious layered textures)
  • Lightmaps
  • Bumpmaps/Normalmaps
  • Environmentmaps
  • Specularmaps

Overview

Specification

Full general Layout

<?xml version="1.0" encoding="iso-8859-1"?>
<i3D name="MyScene" version="1.6" xsi:noNamespaceSchemaLocation="http://i3d.giants.ch/schema/i3d-1.vi.xsd">
<Files>..</Files>
<Materials>..</Materials>
<Shapes>..</Shapes>
<Dynamics>..</Dynamics>
<Scene>..</Scene>
<Animation>..</Blitheness>
<UserAttributes>..</UserAttributes>
</i3D>

Coordinate Systems

I3D uses a right-handed coordinate system.

Files

All used file references are defined hither. File handles are mapped to the corresponding filenames.

<Files>
<File fileId="i" filename="myTexture1.png" relativePath="true"/>
...
</Files>

Materials

Materials used in the materials attribute of Shape nodes within the scenegraph department are defined in this department.

<Materials>
<Cloth name="myShader_001" materialId="12">
<Texture fileId="1"/>
</Material>
...
</Materials>

Shapes

Shapes are defined here and referenced from the scene graph section. This machinery allows multiple instancing of shapes.

Dynamics

Dynamic objects are divers in this part and referenced from the Scene graph department.

<Dynamics>
<ParticleSystem proper name="emitter1" dynamicId="1" type="sprite" rate="0.004" lifespanInfinite="simulated"
speed="0.01" speedRandom="0" tangentSpeed="0" normalSpeed="i" lifespan="10000" maxCount="1000"
spriteScaleX="fifty" spriteScaleY="50" depthSort="false" emitterShape="pCubeShape1" shader="lambert2">
<Gravity force="0 -3 0"/>
<Air velocity="two 0 0"/>
</ParticleSystem>
</Dynamics>

Scenegraph

The Scene graph hierarchy (transformations, bones, joints, shapes, lights, cameras and particle systems) are stored in this department. Shapes, materials and particle systems are stored as references.

<Scene>
<TransformGroup name="myGroup1" translation="1.25 0 -9" nodeId="47">
<Shape name="mySphere" materialIds="i" shapeId="1" nodeId="48"/>
<TransformGroup name="myGroup2" rotation="xc 0 270" nodeId="49">
<Shape proper name="mySphere2" materialIds="1" shapeId="2" nodeId="l"/>
</TransformGroup>
...
</TransformGroup>
...
</Scene>

Scene graph node types

TransformGroup

Attribute	Description	Type	Optional
name	Proper noun of TransformGroup	string	no
translation	Translation	complex	yep
rotation	Rotation, euler guild ZY'10''	circuitous	yeah
scale	Scale	complex	yes
visibility	Visibility	boolean	yes
kinematic	Kinematic object	boolean	yes
dynamic	Dynamic object	boolean	yes
static	Static object	boolean	yes
compound	Compound parent	boolean	yes
compoundChild	Compound child	boolean	yes
collision	Enable standoff	boolean	yes
ccd	Continuous standoff detection	boolean	yes
trigger	Trigger	boolean	yes
fabric	Fabric	boolean	yeah
restitution	Restitution	bladder	yep
staticFriction	Static friction	float	yes
dynamicFriction	Dynamic friction	bladder	yes
skinWidth	Skin width	float	yep
density	Density	float	yep
collisionMask	Collision mask	integer	yes
articulation	Joint	boolean	aye
breakableJoint	Breakable joint	boolean	aye
jointBreakForce	Articulation break force	double	yes
jointBreakTorque	Joint break torque	double	yes
project	Enable joint project	boolean	yes
xAxisDrive	Enable ten axis drive	boolean	yes
yAxisDrive	Enable y axis drive	boolean	yes
zAxisDrive	Enable z axis bulldoze	boolean	yeah
drivePos	Enable bulldoze position	boolean	yeah
projDistance	Project distance	double	yes
driveForceLimit	Drive strength limit	double	yes
driveSpring	Drive spring	double	aye
driveSpring	Drive spring	double	yes
solverIterationCount	Solver iteration count	integer	yep
rotMinX	Rotation minimum x	double	yep
rotMinY	Rotation minimum y	double	yes
rotMinZ	Rotation minimum z	double	yes
rotMaxX	Rotation maximum ten	double	yes
rotMaxY	Rotation maximum y	double	aye
rotMaxZ	Rotation maximum z	double	yes
transMinX	Translation minimum x	double	yes
transMinY	Translation minimum y	double	aye
transMinZ	Translation minimum z	double	aye
transMaxX	Translation maximum x	double	yes
transMaxY	Translation maximum y	double	yes
transMaxZ	Translation maximum z	double	yes
objectMask	Object mask	integer	yes
nodeId	Node reference id, used for Animation and UserAttributes department	integer	no

Element	Description	Type	Cardinality
TransformGroup	Transform grouping node	circuitous	0..North
Shape	Shape node	complex	0..N
Photographic camera	Camera node	complex	0..Due north
Light	Light node	circuitous	0..North
Dynamic	Dynamic node (eg. particle arrangement)	complex	0..N

Shape

Aspect	Description	Type	Optional
shapeId	Shape reference id (reference to shapes section)	string	no
materialIds	List of used textile ids (reference to materials section)	string	no
skinBindNodeIds	Skin demark node ids	string	yes
castsShadows	Casts shadows	boolean	yes
receiveShadows	Receive shadows	boolean	yes
clipDistance	Clip distance	double	yes
nonRenderable	Non renderable	boolean	yes

Camera

Attribute	Description	Type	Optional
fov	Field of view	double	no
nearClip	Most clipping plane	double	no
farClip	Far clipping plane	double	no

Light

Aspect	Clarification	Blazon	Optional
blazon	Light type	string	no
diffuseColor	Diffuse color	complex	yes
emitDiffuse	Emit lengthened	string	yeah
specularColor	Specular color	circuitous	aye
emitSpecular	Emit specular	string	yes
castShadowMap	Cast shadow Map	boolean	yes
depthMapBias	Depth map bias	double	yes
depthMapResolution	Depth map resolution	integer	yeah
shadowFarDistance	Shadow far fistance	double	yes
shadowTextureOffset	Shadow texture offset	double	yes
shadowExtrusionDistance	Shadow extrusion distance	double	yes
decayRate	Decay rate	integer	yes
coneAngle	coneAngle	double	yes
dropOff	dropOff	integer	yes
projTexture	Projective texture name	string	yep
range	Range	double	no

5 Dynamic

Attribute	Description	Type	Optional
dynamicId	Dynamic id (reference to dynamics section)	string	no

Example

<Scene>
<Camera name="camera1" translation="0 2.00 6.47" rotation="-13.07 0 0" fov="54.43" nearClip="0.01" farClip="g" nodeId="34"/>
<Light proper name="pointLight1" translation="6.56 5.76 4.04" type="point" diffuseColor="1 one one" range="ten" nodeId="35"/>
<TransformGroup proper noun="group1" translation="1.35 0.96 0.81" nodeId="36">
<Shape proper noun="pCubeShape1" rotation="-23.94 6.49 14.29" materialIds="one 2" shapeId="one" nodeId="37"/>
</TransformGroup>
</Scene>

Animation

Motions are defined in this office. Clips are the basic edifice block and permit Non-Linear Animation by composing multiple clips.

<Animation>
<AnimationSets>
<AnimationSet proper noun="walk_crouched">
<Clip name="walk_crouched1Source" duration="1000">
<Keyframes nodeId="Hips">
<Keyframe time="0" translation="-0.467 13.504 39.842"/>
<Keyframe time="333" translation="-0.559 12.915 39.370"/>
<Keyframe time="one thousand" translation="-2.610 eleven.917 35.462"/>
</Keyframes>
<Keyframes node="Chest">
<Keyframe time="0" rotation="-1.013 -iv.465 0.890"/>
<Keyframe time="666" rotation="10.009 -6.667 4.381"/>
<Keyframe time="m" rotation="11.638 -iii.906 4.115"/>
</Keyframes>
</Prune>
</AnimationSet>
</AnimationSets>
</Animation>

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Source: https://gdn.giants-software.com/documentation_i3d.php

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