"model (draw, render, animate, simulate, ...) a possible final project"
website
Note: until recently, Rhinoceros was available for free for Mac users. However, at this moment, it is offered at a commercial rate.
I've started to learn Rhino. Below are two renders of the idea I am working on at the moment.
I then used the renders as a background for sketches. Here are a few examples. I might experiment more with this technique, for instance for making user storyboards. I think this is a good approach to quickly get a sense of a design's feasability and usability. Also, integrating renders into actual photos (e.g. of user context or places of use) might be very helpful.
