Bump effect lets you easily simulate surface relief: embossing, leather, stone and so on. You load a heightmap and Boxshot simulates the surface according to the loaded image brightness. See the Bump section of the Materials panel.
You can adjust the following parameters:
- Mode - choose between no bump, normal bump and offset bump;
- Texture - lets you load a heightmap image;
- Level - controls the level of the effect, this is basically the relief height.
Normal bump just changes the normal direction, affecting reglection and refraction. It works on reflective materials only, as otherwise there is no way to see how it works. Good for leather, glass, wood effects. Here are three spheres with 0%, 50% and 100% stone bump effect:
This one works on flat surfaces only and takes care about lighting and shadows, so it is great for embossing effects:
While looking great, the effect doesn't change the shape itself, so it is still flat and it is better to look on it from top.
This type of bump is not supported by the hardware-accelerated preview drivers (Simple and Advanced GL) and also doesn't work with the old "RayTracer" rendering engine. Use "Raytracer 2" in both preview and production modes to see the bump.