Can I create a 3d model from pictures that are available on the internet and put it into a small animation and post it on YouTube? For example I want to create a 3d model of a car from images found on the internet and then put it into animation of crashing it then posting it on Youtube. Is this illegal? Will it violate copyrights?
This sounds more like a copyright related issue, than a graphic design issue. So it's probably not appropriate for GraphicDesign.
Found some links that might help you though:
Anything we say here is probably speculation (you would need to ask a lawyer to get the proper response), but having said that, I wonder:
Would you be replicating the exact same shape of the car? Would there be a logo or visible brand?
If the answer to these two is no, and you will only use the car for inspiration, I (personally) don't believe it's a problem. The model would be done by you. I don't think you are violating copyright by showing, for example, a brand in a short film or movie (except if you portray the brand in a very negative way, but then the line is also not very clear).