Sketchup exported collada can not be imported properly.

[Frontrider]

When importing dae from Sketchup, the import gets several different errors. Importing the same dae file into blender then exporting it as dae always fixes it, but is not a working solution. Sketchup does not have GLTF support so this is the only format that can work.

This dae file produces this error:
https://cdn.discordapp.com/attachments/275788728168087556/871370866452226058/terrain.dae
https://cdn.discordapp.com/attachments/275788728168087556/871370304478392330/2021-08-01_14-34-20.png
editor/collada/collada.cpp:1060 - Primitive type "polygons" is not well supported (concave shapes may fail). To ensure that the geometry is properly imported, please re-export using "triangles" or "polylist".
This was fixable by changing that "polylist" setting to triangles.

With tringles enabled, we get this:
https://cdn.discordapp.com/attachments/275788728168087556/871376248692154408/terrain.dae

with this error:

 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.
 editor/collada/collada.cpp:1691 - Multiple instance_* not supported.```
 
 

[Frontrider]

wrong repo

[Calinou]

Superseded by godotengine/godot#51148.