# 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

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## 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

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## 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

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## 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+

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## 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

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## 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

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## 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

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## 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

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## 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

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**Version**: 1.0
**Last Updated**: [Current Date]