[QGIS-Developer] QGIS 3D: Support for 3DM (x,y,z,m)

[Jakob Lanstorp]

>>M values are ignored as their meaning is application specific. How 
>>would you like to use M values in the 3D view? 

M values is not for rendering in 3D, but just residing as part of my
existing 4D data. When the M value is present the Z value is reset to 0 -
and not rendered correct. Right now I would have to strip the M value from
my data before rendering in the QGIS 3D map. 

It could actually be useful rendering the M value as a label in the 3D map.
It could be age or velocity of a particle in groundwater particle flowmodel.

You 3D terrain model work with 2D draping works just fine. As I stated in
the qgis issue log - having rendering of negative Z values could be fine for
subsurface data.

Anyways a very good job done yet.



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Jakob Lanstorp
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