This new tutorial was developed after seeing some discussions on another forum on Lightwave, about how to make an effect that looks similar to a lottery ticket scratcher. As you scratch the surface, a message underneath is revealed. Something like 'try again' or 'you win!', typically.

It was suggested that a 2D animated texture could be used for much of the effect, attached to a rectangle in 3D thereafter.

So I toyed a little with the idea of doing this in Project Dogwaffle.

http://www.thebest3d.com/pdpro/tutorials/scratchme

The Bluescreening technique lends itself to a whole slew of different compositing techniques, far beyond the usual video of a person walking or dancing in front of a blue screen and wanting to be composited into a background animation. In this case, we simply paint an animated blue, progressive bit of paint with a single brush stroke mimicking the scratching effect's path. The brush Stroke editor is used in Hancock mode to force that brush stroke across all frames of the animation-to-be. The clip is then bluescreen-composited into a background clip. Instead of having a walking character in the middle with blue surrounding him, we're looking at a blue hole growing on the inside, surrounded by the ticket's paper pattern and texture. As you 'scratch', more and more blue is painted into it, resulting in more and more of the background clip being divulged.