SketchUp to 3DS - double vertices with mutliple materials

[yp]

Hi guys,

 

this is something I came across multiple times in the past, always wondering what was happening..

 

I never really mattered drastically for my workflow, which is mainly using SU for 80% modeling and pre-texturing, then switching to 3DS for further processing, adding props, scattering, final texturing and rendering. Classic for some people I would say

 

Sometimes imported objects through (at least native) Sketchup's .skp files would end up having double vertices. Sometimes I didnt even recognize it, sometimes it mattered and I fixed it by welding all vertices with a low threshold.

 

But today I started investigating, because in a recent project I DO run into trouble now if its happening - so I had to find out.

 

Figured out its actually happening on objects which contain multiple materials in Sketchup (-> results in a muti-material in 3DS / unique MatIDs) >> and only where those materials meet!

 

Weird, but narrowed down, thats something...

 

I cant change anything on SU side and I cant use any other export format.

 

I'm using SU 2016 (saving out a Ver. 7 file to import it in Max) and 3DSMax 2016.

 

Any idea what causes this, how to avoid it or how to batch process it in 3DS? Well, might find a script though that welds all vertices of all scene objects at given tolerance, should be easy - still open for guesses.

 

Thanks

Niko