Tutorial Accessories en

Accessories Physics Setup

日本語版

This tutorial explains how to set up physics for objects other than hair and skirts.

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Prerequisites

• Completed Quick Start
• SkeletalMesh with target bones

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Earrings

Setup for small accessories.

Reference Parameters

Parameter	Reference	Description
Damping	0.1-0.2	Light sway
Stiffness	0.05-0.1	Soft movement
World Damping Location	0.5-0.7	Moderate following
Dummy Bone Length	3-5	Improve end bone control
Gravity	(0, 0, -0.8)	Gravity influence

Tips

• Set Dummy Bone Length for short bone chains
• Use Gravity for natural draping
• Use Spherical Limits to prevent head penetration

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Ribbons & Capes

Setup for cloth-like accessories.

Reference Parameters

Parameter	Reference	Description
Damping	0.15-0.25	Moderate damping
Stiffness	0.1-0.15	Shape retention
World Damping Location	0.6-0.8	Stable movement
World Damping Rotation	0.6-0.8	Rotation stability
Limit Angle	45-90	Allow large movement

For Capes

Long capes need attention to:

1. Use Bone Constraint to prevent spreading
2. Use Planar Limits for back penetration
3. Use Curve Data to soften the hem

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Tails

Setup for animal character tails.

Reference Parameters

Parameter	Reference	Description
Damping	0.2-0.3	Moderate settling
Stiffness	0.15-0.25	Shape retention
World Damping Location	0.7-0.9	Focus on stability
Limit Angle	30-60	Natural range of motion
Gravity	(0, 0, -0.3)	Light gravity

Tips

• Use Curve Data for stiff base and soft tip
• Use Spherical Limits or Capsule Limits to prevent body penetration
• Combine with animation for better expression

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Weapons (Swords, Staffs, etc.)

Setup for near-rigid items.

Reference Parameters

Parameter	Reference	Description
Damping	0.3-0.5	Quick settling
Stiffness	0.3-0.5	Strong shape retention
World Damping Location	0.8-1.0	High stability
Limit Angle	10-30	Small sway

Sword Sway

To express residual sway after swinging:

1. Higher Stiffness to ensure rigidity
2. Moderate Damping to allow sway
3. Limit Angle to restrict sway range

Staffs, Flags, etc.

For items with soft parts (decorations, flag cloth):

1. Set only the soft part as Root Bone
2. Use cloth-like parameter settings

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Setting Up Multiple Accessories

When a character has multiple physics objects:

AnimGraph Example

[Existing Animation]
    ↓
[KawaiiPhysics: Hair]
    ↓
[KawaiiPhysics: Left Earring]
    ↓
[KawaiiPhysics: Right Earring]
    ↓
[KawaiiPhysics: Ribbon]
    ↓
[Final Animation Pose]

Performance Considerations

• Be mindful of processing load with many nodes
• Disable Update Physics Settings In Game
• Consider disabling invisible parts

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Using External Forces

Wind Effects

Add wind influence to accessories:

1. Enable Enable Wind
2. Place WindDirectionalSource in level
3. Adjust influence with Wind Scale

Custom External Forces

Use External Forces for special movement:

• Basic: Force in constant direction
• Gravity: Character-dependent gravity
• Curve: Time-varying force

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Troubleshooting

Sway is too small

• Lower Stiffness
• Lower Damping
• Adjust Gravity

Sway is too large

• Increase Stiffness
• Decrease Limit Angle
• Increase World Damping

Penetrates body

• Add Spherical Limits or Capsule Limits
• Adjust collision position and size

Unnatural end bones

• Set Dummy Bone Length
• Adjust end parameters with Curve Data

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Related Links

• Parameter Reference - All parameter details
• FAQ - Frequently asked questions
• Hair Setup
• Skirt Setup