I noticed a problem a long time ago. There is no shadow on the bottom of the car. I think this is caused by too many model faces. I did an experiment where I put a face inside a car that doesn’t produce a shadow
Nice renderings! 
When a model has in fact a lot of polygons then no shadow will be cast to help with performance. You’ve used a nice workaround. The other workaround would be to reduce the faces accordingly.
Kind of hard to do when they are Enscape provided assets.
Our Enscape Assets should not show this behavior, they should all cast shadows just fine since they’re optimized that way. Do you experience this problem above with any of our Assets @Gadget_1 ? This car which has been used in the rendering is not available in the Asset Library.
With ‘optimized that way’, do you mean they are sufficiently low poly, or are there other optimization techniques you’re using?
They are optimized in a way that they’re not too high poly to cause performance problems for example, but also not too low poly so that our Assets still look detailed and good in Enscape of course.