Help please - using ramp shader as a bump map.
I'm working through a tutorial and my attempt is not working as it should. Basically, in the hypershade window, you create a ramp shader for the colour gradient, and then use a copy of the same ramp to bump map noise onto the tooth. This should result in straight, vertical styrations that gradually fade out.
Mine don't though - they appear to spiral somewhat, and there is an obvious seam on one side. Shouldn't it be seamless, given that it is a gradient in the V direction (starting from the bottom up, all the way around)? Also, shouldn't it be straight? It is in the tutorial video.
Here's an image.