vr-ar

name	vr-ar
description	VR/AR development principles. Comfort, interaction, performance requirements.
allowed-tools	Read, Write, Edit, Glob, Grep

VR/AR Development

Immersive experience principles.

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1. Platform Selection

VR Platforms

Platform	Use Case
Quest	Standalone, wireless
PCVR	High fidelity
PSVR	Console market
WebXR	Browser-based

AR Platforms

Platform	Use Case
ARKit	iOS devices
ARCore	Android devices
WebXR	Browser AR
HoloLens	Enterprise

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2. Comfort Principles

Motion Sickness Prevention

Cause	Solution
Locomotion	Teleport, snap turn
Low FPS	Maintain 90 FPS
Camera shake	Avoid or minimize
Rapid acceleration	Gradual movement

Comfort Settings

• Vignette during movement
• Snap vs smooth turning
• Seated vs standing modes
• Height calibration

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3. Performance Requirements

Target Metrics

Platform	FPS	Resolution
Quest 2	72-90	1832x1920
Quest 3	90-120	2064x2208
PCVR	90	2160x2160+
PSVR2	90-120	2000x2040

Frame Budget

• VR requires consistent frame times
• Single dropped frame = visible judder
• 90 FPS = 11.11ms budget

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4. Interaction Principles

Controller Interaction

Type	Use
Point + click	UI, distant objects
Grab	Manipulation
Gesture	Magic, special actions
Physical	Throwing, swinging

Hand Tracking

• More immersive but less precise
• Good for: social, casual
• Challenging for: action, precision

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5. Spatial Design

World Scale

• 1 unit = 1 meter (critical)
• Objects must feel right size
• Test with real measurements

Depth Cues

Cue	Importance
Stereo	Primary depth
Motion parallax	Secondary
Shadows	Grounding
Occlusion	Layering

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6. Anti-Patterns

❌ Don't	✅ Do
Move camera without player	Player controls camera
Drop below 90 FPS	Maintain frame rate
Use tiny UI text	Large, readable text
Ignore arm length	Scale to player reach

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Remember: Comfort is not optional. Sick players don't play.