Frederik -
I understand the impetus for your post but I think it's a misunderstanding.
I wanted to try to use OBJ files because I'm comparing VRay and Thea for a possible purchase. The problem I have with VRay is that it's locked to SketchUp but I want to be able to use 2 or 3 modeling programs. I'm not quite clear about whether Thea has the same limitation or not, the manual didn't help out there.
Manuals vs video tutorials -
Most software is designed and marketed by extremely advanced computer users. And the loudest voices on the forums driving the development of the software tend to be also from very advanced users. The problem with this is that very often these same people are not particularly good teachers. The ability to present material in a way that a novice can understand, or to even remember what questions they had when they were novices is actually quite rare. Thus the poor quality of most training material.
I skimmed through the manual and it's very detailed but it didn't help me at all to get started. I still contend that a couple simple, basic tutorials that do not go into depth, do not go into complex technical detail, do not explain ad nauseum every panel and widget on the screen, but instead take an object or a scene and explain step by step how to get it into Thea, how to change a couple of materials, how to add or remove a texture will be more useful for novices than the manual in it's present state.
This was not meant to be a criticism - just a suggestion going forward.