I'm guessing the scale of the texture in Sketchup determines the scale of the texture in Thea, so I just dont understand why the displacement of the texture should be completely wrong? Any ideas from any Thearender users? 'NewTopic' button should do the trick. Sounds like UV mapping is not done in SU.
Use the texture that you are using for your own material also in SU (in SU import bitmap as texture). Apply and scale texture SU and (then use SU2Thea to apply your material from Thea library) export to Thea. Now if you apply material with same texture (if not already applied with SU2Thea), everything should be in correct scale. Sorry, don't quite understand the issue with displacement sale, do you meant the height?
You give that in centimeters. Maybe a example of your issue in Thea forums is needed. I'd recommend to continue there. I think I'm basically doing exactly as you posted notareal, applying the texture from my Thea material folder into sketchup then exporting to Thearender. For some reason the displacement map looks as if it is about 5 times too large once imported into Thea.
So for example displacement on my brickwork should occur every 75mm (or 7.5cm in Thea) but it is showing at something like every 375mm, i.e. Every 5th brick course. So the displaced grass that looked fine in the material editor also looks crazy within Thea after exporting from SU, the displacement is far too large. I'm not sure why the scaling of the displacement seems to be ignoring the mapping of the diffuse texture. I dont see those 'New Topic' icons, I knew they had to be there but for some reason they are not showing for me, must be my browser problem. I'll try my other machine later, thanks.