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Bump Channel

The Bump channel controls the surface roughness, giving the surface the illusion of being bumpy. Bump channels only affect surface normals, i.e., the geometry that faces the camera. As a result, the edges of the surface still appear smooth despite having bump applied. The amount of bumpiness is controlled by an image map that is usually grayscale.


You have the following options when working with this channel:

  • Strength: When a bump map is selected, the Bump Strength slider controls the strength of the bumps, or how rough the surface appears. A setting of 0% means that the bump map will have no effect on the surface. A setting of 100% means that the bump map will have full effect on the surface.

    If no bump map is selected, i.e., the texture selector indicates “None,” then the slider will not be visible. Select a texture and the slider will be displayed.
  • Image Menu: To assign a texture map as a bump map, click on the field to display a menu where you can select a texture from the list or browse for a new texture. A menu prompts you to browse for a new image and displays images that are already present in your scene.
  • Minimum: This setting controls the minimum amount of depth that will result with the darkest areas in the bitmap image. Negative values will increase the amount of depth that you can achieve.
  • Maximum: This setting controls the maximum height that will result with the lightest portion of the bitmap image. Higher values offset the surface more than lower values.

Tip graphic TIP! While it is possible to use minimum and maximum bump at the same time and can be useful when finessing a bump impression into an object, if the numbers are equal, they will cancel each other out.