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Implement mathematically accurate Mandelbulb fractal geometry generation with configurable level-of-detail parameter. Includes: - MandelbulbGenerator class with distance estimation algorithm - Surface extraction using marching cubes approach - Normal calculation for proper lighting - Vertex deduplication for optimization - Integration with existing ubench benchmark framework - Multiple LOD benchmarks (16, 32, 64 resolution) - USD GeomMesh creation and USDA file export benchmarks Performance results show ~17ms for LOD 16 generating ~335 vertices. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>