In 3D models, diffuse color and specular reflection are distinct light interaction properties: diffuse scatters light uniformly for base color, while specular reflects light directionally for shiny highlights.
- **Diffuse Color**: Determines an object’s base hue by scattering light evenly in all directions. Visible from most angles, it creates the overall, non-shiny appearance (e.g., matte paint, fabric).
- **Specular Reflection**: Mimics shininess by reflecting light in a narrow, focused beam. Produces bright highlights (e.g., on metal, wet surfaces) that depend on light source and viewer angle, enhancing realism.
Together, they define a surface’s look: diffuse for base color, specular for shine.