uv mapping

**UV mapping** is the **process of unwrapping a 3D surface into 2D coordinates so textures can be applied consistently** - it establishes how image-space material data maps onto mesh geometry. **What Is UV mapping?** - **Definition**: Assigns each mesh vertex a UV coordinate in texture space. - **Unwrap Strategy**: Surface seams are cut to flatten geometry with manageable distortion. - **Layout**: UV islands are packed to maximize texel usage and minimize wasted space. - **Dependency**: All texture baking and painting workflows rely on stable UV layouts. **Why UV mapping Matters** - **Texture Fidelity**: Good UVs prevent stretching and preserve material detail. - **Production Speed**: Clean UV layouts simplify texturing and reduce rework. - **Cross-Tool Compatibility**: Standard UV coordinates are portable across render and CAD ecosystems. - **Memory Efficiency**: Efficient packing improves quality at fixed texture budgets. - **Risk**: Poor seam placement creates visible artifacts in final renders. **How It Is Used in Practice** - **Seam Placement**: Put seams in low-visibility regions when possible. - **Distortion Check**: Use checker maps to detect stretching before texture authoring. - **Texel Density**: Maintain consistent texel density across related asset components. UV mapping is **the foundational coordinate system for texture-driven 3D appearance** - UV mapping should be treated as a quality gate because it drives downstream texture and shading fidelity.