Normal Map

A normal map is an RGB texture that stores the per-pixel surface direction, or normal vector, of a model. When a shader reads it, it bends how light reflects to create the illusion of fine detail such as scratches, pores, and panel lines on flat geometry. It adds apparent detail without adding polygons.

Each pixel encodes an X, Y, Z direction in its red, green, and blue channels, telling the shader which way that part of the surface faces. The lighting calculation uses those directions instead of the real flat geometry, so light catches nonexistent bumps and grooves convincingly.

A bump map is grayscale and only stores height, nudging the perceived surface up or down. A normal map is RGB and stores full 3D surface direction, so it reacts to light from any angle far more accurately. Normal maps have largely replaced bump maps in modern PBR pipelines.

A normal map only changes how light hits a flat surface, so the silhouette stays unchanged. A displacement map physically moves geometry, altering the silhouette and casting real shadows. Normal maps are cheaper; displacement is used when the outline must be correct.

The dominant blue color comes from the Z axis, the up direction of the surface, being stored in the blue channel. Flat areas point straight out, so they read as light blue-purple. Deviations toward red and green indicate the surface tilting along X and Y.

You create a high-poly sculpt, a matching low-poly mesh with clean UVs, then bake the high-poly surface detail into a normal map using tools like Blender, Marmoset Toolbag, or Substance Painter. The low-poly mesh then displays the sculpted detail at a fraction of the polygon cost.

Tangent-space normal maps are relative to the surface, so they deform with the model and are ideal for animated or reusable meshes. Object-space normal maps are locked to the model's orientation, which is more accurate for static objects but does not tolerate deformation. Tangent space is the common default.

No. A normal map only changes how light interacts with the surface, so the mesh silhouette stays flat. For real geometric detail that changes the outline you need a displacement map or added polygons.

Yes. Meshy outputs normal maps as part of its PBR texture set, so AI-generated 3D models arrive with crisp surface detail already baked in. You can import them straight into your engine without running a manual baking pass.