[Therion] Coloring on a altitude basis

[Marco Menchise]

Hello, I searched in the archives and I didn't find an answer.

I like to make plan and extended sections colored by altitude because this
is a way to add a "3rd dimension" to a plan drawing. I also like to have
the same color in the same cave region either in plan and extended section.
This way makes very easy to identify same portions of a cave in both
projections.

Because Therion colors on scrap basis, I'm forced to draw plan and extended
section using the same scrap subdivision. This is a very complex operation
and it's not always simple to have the same scrap structure in both
projections.

Is there a way or a trick to color by altitude, maybe defining an "altitude
step" to change colors?

Thanks,
Marco
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