[QGIS-Developer] QGIS3D: Caching triangulation of terrain data

[Andreas Neumann]

Hi, 

While exploring QGIS3D more, I noticed that my terrain is triangulated
each time I load the project. 

I wonder if it wouldn't be better to store this triangulation along with
the Geotiff storing the DEM, e.g. in a sidecar file. Terrain is pretty
static. We only get updates of our LIDAR data every 5-10 years ... it
doesn't make much sense to triangulate this data again and again. 

Is this something that could be improved in QGIS 3.2? 

Thanks, 

Andreas
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