V-Ray for Rhino Manual - Rum

Image on the left is result of using only brushed metal Bitmap. The surface of the teapot looks very
smooth. Image on the right is rendered with Bump map added to the teapot and its handle.
Obviously you can see the Bump texture within the brushed metal and handle.
And also, earlier we talked about using Reflection>Glossiness to adjust reflecting material's
glossiness and create frosted look of the object. If add a little bit of Bump map to it now will make
the object looks even better.
Image on the left is using only Glossiness from Reflection setting. Image on the right has Bump map
added to it.
Below are some examples of textures created with Bump map.
Bump map is created using the grayscale of the Bitmap to set the high and low texture. The bright part of the
Bitmap is considered as high part and the dark is low. The Bump map is seen more clearly at the part where
the object reflects the most of the light. Using Bump map texture to create bumped texture is only a visual
effect, not the true surface of the object. Look at the edge of the object and you will still see the smooth
surface.
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V-Ray for Rhino