Vr Ar

1---
2name: vr-ar
3description: VR/AR development principles. Comfort, interaction, performance requirements.
4allowed-tools: Read, Write, Edit, Glob, Grep
5---
6 
7# VR/AR Development
8 
9> Immersive experience principles.
10 
11---
12 
13## 1. Platform Selection
14 
15### VR Platforms
16 
17| Platform | Use Case |
18|----------|----------|
19| **Quest** | Standalone, wireless |
20| **PCVR** | High fidelity |
21| **PSVR** | Console market |
22| **WebXR** | Browser-based |
23 
24### AR Platforms
25 
26| Platform | Use Case |
27|----------|----------|
28| **ARKit** | iOS devices |
29| **ARCore** | Android devices |
30| **WebXR** | Browser AR |
31| **HoloLens** | Enterprise |
32 
33---
34 
35## 2. Comfort Principles
36 
37### Motion Sickness Prevention
38 
39| Cause | Solution |
40|-------|----------|
41| **Locomotion** | Teleport, snap turn |
42| **Low FPS** | Maintain 90 FPS |
43| **Camera shake** | Avoid or minimize |
44| **Rapid acceleration** | Gradual movement |
45 
46### Comfort Settings
47 
48- Vignette during movement
49- Snap vs smooth turning
50- Seated vs standing modes
51- Height calibration
52 
53---
54 
55## 3. Performance Requirements
56 
57### Target Metrics
58 
59| Platform | FPS | Resolution |
60|----------|-----|------------|
61| Quest 2 | 72-90 | 1832x1920 |
62| Quest 3 | 90-120 | 2064x2208 |
63| PCVR | 90 | 2160x2160+ |
64| PSVR2 | 90-120 | 2000x2040 |
65 
66### Frame Budget
67 
68- VR requires consistent frame times
69- Single dropped frame = visible judder
70- 90 FPS = 11.11ms budget
71 
72---
73 
74## 4. Interaction Principles
75 
76### Controller Interaction
77 
78| Type | Use |
79|------|-----|
80| **Point + click** | UI, distant objects |
81| **Grab** | Manipulation |
82| **Gesture** | Magic, special actions |
83| **Physical** | Throwing, swinging |
84 
85### Hand Tracking
86 
87- More immersive but less precise
88- Good for: social, casual
89- Challenging for: action, precision
90 
91---
92 
93## 5. Spatial Design
94 
95### World Scale
96 
97- 1 unit = 1 meter (critical)
98- Objects must feel right size
99- Test with real measurements
100 
101### Depth Cues
102 
103| Cue | Importance |
104|-----|------------|
105| Stereo | Primary depth |
106| Motion parallax | Secondary |
107| Shadows | Grounding |
108| Occlusion | Layering |
109 
110---
111 
112## 6. Anti-Patterns
113 
114| ❌ Don't | ✅ Do |
115|----------|-------|
116| Move camera without player | Player controls camera |
117| Drop below 90 FPS | Maintain frame rate |
118| Use tiny UI text | Large, readable text |
119| Ignore arm length | Scale to player reach |
120 
121---
122 
123> **Remember:** Comfort is not optional. Sick players don't play.
124