Thanks for the many helpful ideas on this problem but maybe I need to
expound a little further on my needs.

1. For my application the top of the 'wall' always remains at the same
level. Hey! that should make it simpler.

2. As the height_field rises, less of the wall is seen. At an extreme the
wall disappears into the height_field. The wall base can be at the base of
the height_field.

3. I need to texture the wall. I say this since some solutions with a simple
color do not appear to work the same way when a texture is involved.

4. I have several/many wall sections scattered throughout the image. My
preference would be to put generalized code into the .ini file for all of
the wall sections and then put the center-line co-ordinate list(s) into the
.pov file which is, in turn, created by a source generating program.

David

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