Coding/Technical Info

Coding and Technical Aspects of Armatures, Animations, and Props in VRChat

VRChat supports complex interactions, animations, and physics-based objects, allowing creators to bring their worlds and avatars to life. The backbone of these features involves armatures, animations, and props, which require Blender, Unity, and some scripting knowledge. Let’s break down each aspect in detail.

1. Armatures & Rigging in VRChat

What is an Armature?

An armature is a digital skeleton that gives avatars and objects movement. It consists of bones (joints) that define how different parts of the model move.

Steps to Rig an Avatar or Object

Create a Model in Blender – Design your avatar or prop.
Add an Armature (Skeleton) – Use Blender’s Armature Modifier to add bones.
Weight Paint the Mesh – Assign how different parts of the mesh move with bones.
Export as .FBX – Ensure you check “Apply Transform” before exporting.
Import into Unity – Set the rig type to “Humanoid” (for avatars) or “Generic” (for props).

IK (Inverse Kinematics) for VRChat Avatars

VRChat uses Inverse Kinematics (IK) to track player movement and apply it to the avatar’s bones.
A proper armature setup allows for natural movement, gestures, and full-body tracking support.

2. Animations in VRChat

Types of Animations in VRChat

VRChat supports custom animations for avatars, props, and interactive world elements. These animations are typically created using Blender, Unity, and Animator Controllers.

Common VRChat Animations:

✅ Gestures & Emotes – Custom hand gestures, dancing, expressions.
✅ Toggles – Switching accessories, outfits, and props on/off.
✅ Facial Expressions – Blinking, smiling, talking animations.
✅ World Animations – Moving objects, opening doors, environmental effects.

How to Create Animations for VRChat

Create an Animation in Blender – Use keyframes to define movements.
Export as .FBX – Ensure animation data is included.
Import into Unity – Drag the animation file into the project.
Use Unity’s Animator Controller – Connect animations using the Animator system.
Set Triggers in VRChat SDK – Use VRChat Expressions and Parameters to activate animations.

3. Props & Interactive Objects in VRChat

Types of Props & Their Uses

Props in VRChat can be static (decorations) or interactive (usable items, weapons, tools, etc.). Some props follow physics (rigidbodies), while others are animated or toggle-based.

How to Add Props to VRChat

Create or download a Prop–Model in Blender or use a VRChat-ready asset.
Add Colliders & Physics in Unity – Ensures objects can be interacted with.
Use VRC Pickup Component – Allows players to pick up and interact with props.
Configure Animations (If Needed) – Attach Animator Controller for moving props.
Upload using VRChat SDK – Include in an avatar or world.

4. Coding in VRChat (Unity C#, Udon, UdonSharp)

While Blender and Unity handle the visual side, coding is used to make objects interactive. VRChat primarily uses Udon, a node-based visual scripting language. Advanced users can code directly using UdonSharp (C#).

What Can You Code in VRChat?

✅ Interactive Buttons & Triggers – Pressing buttons to open doors, toggle lights.
✅ Dynamic Props – Objects that react to players, physics, or time.
✅ Custom Animations & Effects – Triggered by player actions.
✅ World Mechanics – Custom games, puzzles, teleporters, minigames.

Basic Udon Workflow

Add Udon Behavior – Attach Udon scripts to objects.
Define Events – Example: OnInteract() to trigger an action.
Use Variables & Logic – Example: if (player enters zone) { open door }
Compile & Test in VRChat – Ensure everything functions as expected.

For Examples, go to Coding Examples

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