What is a normal map and when should I use one?
How Normal Maps Work
Each pixel in a normal map stores a direction that tells the renderer how the surface should catch light. The geometry stays flat or low-detail, but the lighting makes it look more complex. Normal maps are common in games and efficient for scenes with many objects.
Normal maps do not change the silhouette of an object. If you look at the edge of a model, it stays smooth, so they work best for details seen at normal viewing distances.
- Adds surface detail without extra geometry
- Does not change the outline of the object
- Often baked from a detailed high-poly model
- Common in games and real-time previews
When to Use One
Use a normal map for small details like screws, rivets, cracks, and textured fabric when the object is seen from a distance. For close-up hero shots, real geometry may look better.
In Blender, connect the normal map image to a Normal Map node and then into the Principled BSDF Normal input. Set the image color space to Non-Color so the lighting reads correctly.
Normal maps can look flat if the light direction is poor. Test your material under the same lighting setup as the final render. Adjust the strength value on the Normal Map node if the detail looks too strong or too faint.
Common mistakes
- Plugging a normal map image in without changing its color space.
- Using a normal map where the silhouette needs real geometry.
