[Therion] Cutting off a grid

[Tarquin Wilton-Jones]

On 24/11/2021 10:49, Tarquin Wilton-Jones via Therion wrote:
> Hi,
> 
> We have a vertical cave that is just over 100 metres deep, with its
> entrance just below a 100 metre contour.
> 
> We want to show a grid on the elevation view, like this:
> 
> #show an altitude grid every 25 metres
> #("50 50" affects only plan view, so is ignored here)
> grid bottom               #behind the cave
> grid-size 50 50 10 meters #one line every 25 metres of depth

Umm, yeah. That should have been "50 50 25"

> grid-coords border        #show numbers at the edge of the survey
> 
> This leaves a 20+ metre gap at the bottom, since the cave only just made
> it past the last 25 metre grid line.
> 
> 1. Is there a way to cut off the grid after a certain amount, so that it
> doesn't show the blank gap at the bottom? Or alternatively, cut off the
> grid after the cave ends? Or "show the next grid line if the cave is
> within 5 metres of it"?
> 
> 2. Is there a way to start the grid at "0" at the entrance to the cave,
> in order to show depth below the entrance instead of the altitude above
> sea level?
> 
> I tried this:
> grid-origin 0 0 400 meters
> But Therion just threw an error with no error message, so I am obviously
> doing something wrong. Does that only work in plan view perhaps?

Cheers,

Tarquin