metaverseDubai/docs/LOD_GUIDELINES.md

LOD Guidelines - Dubai Metaverse

Overview

This document describes LOD (Level of Detail) creation and usage guidelines for the Dubai Metaverse project.

LOD System

Overview

LODs reduce polygon count and detail for distant objects, improving performance while maintaining visual quality.

When to Use LODs

• Non-Nanite Assets: Assets not using Nanite
• Performance: When performance optimization is needed
• Distance: For assets visible at distance

When Not to Use LODs

• Nanite Assets: Nanite handles LOD automatically
• Close-Only Assets: Assets only visible up close
• Simple Assets: Very simple assets may not need LODs

---

LOD Creation

LOD Levels

LOD0

• Detail: Full detail
• Polygon Count: 100% of original
• Distance: 0-50m (close)
• Usage: Close-up views

LOD1

• Detail: High detail
• Polygon Count: 50-70% of LOD0
• Distance: 50-150m (medium)
• Usage: Medium distance

LOD2

• Detail: Medium detail
• Polygon Count: 30-50% of LOD0
• Distance: 150-300m (far)
• Usage: Far distance

LOD3

• Detail: Low detail
• Polygon Count: 10-30% of LOD0
• Distance: 300m+ (very far)
• Usage: Very far distance

---

LOD Generation

Automatic Generation

Unreal Engine

1. Import Settings:

   • Enable "Generate LODs" on import
   • Set LOD count
   • Set reduction settings

2. Post-Import:

   • Right-click mesh > Generate LODs
   • Configure settings
   • Generate LODs

Manual Creation

DCC Tools

1. Create LODs in Blender/Maya:

   • Create simplified versions
   • Maintain shape and silhouette
   • Export as separate meshes

2. Import to Unreal:

   • Import LOD meshes
   • Assign as LODs
   • Configure distances

---

LOD Settings

Distance Settings

Primary Buildings

• LOD0: 0-100m
• LOD1: 100-200m
• LOD2: 200-400m
• LOD3: 400m+

Background Buildings

• LOD0: 0-50m
• LOD1: 50-150m
• LOD2: 150m+

Props

• LOD0: 0-30m
• LOD1: 30-100m
• LOD2: 100m+

---

LOD Quality

Visual Quality

1. Silhouette: Maintain silhouette
2. Shape: Maintain overall shape
3. Details: Remove fine details progressively
4. Materials: Maintain material appearance

Performance

1. Polygon Reduction: Significant polygon reduction
2. Draw Calls: Reduce draw calls
3. Memory: Reduce memory usage

---

LOD Validation

Quality Check

• LODs maintain silhouette
• LODs maintain overall shape
• LOD transitions are smooth
• Visual quality is acceptable
• Performance improvement is significant

Testing

1. Visual Testing: Test LOD transitions
2. Performance Testing: Test performance impact
3. Distance Testing: Test at various distances

---

Best Practices

LOD Creation

1. Start with LOD0: Ensure LOD0 is high quality
2. Progressive Reduction: Reduce detail progressively
3. Maintain Shape: Maintain overall shape and silhouette
4. Test Transitions: Test LOD transitions

LOD Usage

1. Appropriate LODs: Use appropriate LOD count
2. Distance Settings: Optimize distance settings
3. Performance: Balance quality and performance
4. Validation: Validate LOD quality

---

Troubleshooting

Common Issues

Issue: LOD transitions visible

• Solution: Adjust LOD distances
• Solution: Improve LOD quality
• Solution: Use fade transitions

Issue: LODs too aggressive

• Solution: Reduce polygon reduction
• Solution: Improve LOD quality
• Solution: Adjust distance settings

Issue: Performance not improved

• Solution: Verify LODs are being used
• Solution: Check LOD distance settings
• Solution: Profile performance

---

Documentation

LOD Documentation

Document LOD setup:

• LOD Count: Number of LODs
• Distance Settings: LOD distance settings
• Polygon Counts: Polygon count per LOD
• Quality Notes: Quality considerations

---

Version: 1.0 Last Updated: [Current Date]