Basically I want to make small animations to help me visualize the effects of moving vanishing points, receding planes, in order to memorize common distortions. I'm not looking for anything complex just simple lines are fine.
Here's a rough example I made with easytoon. This was just to get an idea of the effect of moving one vanishing point. It's a pain to have to animate by hand.
This is a pretty good example of the quality I'm looking for. I'm not interested in the interactive features, just the animation. This page might not work depending on your browser.