A normal map in 3D texturing is a texture that simulates surface details by encoding direction vectors, altering how light reflects off a 3D model to create the illusion of depth without increasing polygon count.
- **Core Mechanism**: It uses RGB color values to represent surface normals (red for X-axis, green for Y-axis, blue for Z-axis direction vectors), dictating how light interacts with the model’s surface. - **Key Advantage**: Adds fine details like bumps, grooves, or intricate textures to low-poly models, avoiding the need for high-poly geometry. This keeps rendering fast and file sizes small.
In short, normal maps enhance visual realism efficiently, balancing detail and performance in 3D texturing.