> 1)
> If thr is 0 the Starting point will be on the prism edge and I'm not
> sure what the trace result might be in that case though expect one would
> want 0.0 as the returned root.

This was actually happening in my script, and the result was that the intercept
was at the other side of the prism, i.e. the last point! It deserve a dedicated
conditional check.

Thanks
igmar

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