Survex export to kml with 3d passages

[Simon Murphy]

The present .kml export allows for clamp-to-ground, or to export passages. But the passages are 2-d cross sections rather than 3d objects. Ideally, the 3d 'passages' view in aven should be exportable to kml.

A further option would be to specify how high to raise this above its true altitude, since the cave will be below ground and not visible otherwise.

It seems that there is not an existing kml function to draw a floating box without the bottom edge being on the ground. To draw a free-floating box, one has to construct all faces of the box with polygons.

[Olly Betts]

I think this would indeed need vertically aligned polygons for the walls. You can "extrude" a polygon but that extends it all the way to ground level.

I'm a bit dubious how useful raising the whole cave is as if you view from anywhere other than above the alignment is lost, but I can see clamping to the ground being problematic in rough terrain. Perhaps a raised cave with the passage floor extruded would work.

[Simon Murphy]

A raised cave in combination with a plan-view that is clamped to ground (i.e. like a shadow if the sun were directly above) looks good and is useful. This is how I have been visualising at present, but with cross-sections instead of 3d passages.

[Olly Betts]

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