As discussed in Moray.win on the same subject:

Two images to show the use of image bump_maps

First one (bump is almost invisible):
Plane: bump size 2 scale <2,2,1> translate <-1,-1,0> (planar mapping)
Sphere: bump size 1 (spherical mapping)
Cylinder: bump size 1 (cylindrical mapping)

Second one (bump is evident):
Plane: bump size 2 scale <2,2,10> translate <-1,-1,0> (planar mapping)
Sphere: bump size 10 (spherical mapping)
Cylinder: bump size 10 (cylindrical mapping)

Bye

Txemi Jendrix
tji### [at] euskalnetnet
http://www.geocities.com/txemijendrix

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Attachments:
Download 'bump test1.jpg' (41 KB) Download 'bump test2.jpg' (63 KB)

Preview of image 'bump test1.jpg'

Preview of image 'bump test2.jpg'