How to animate a colour change?

I’m still in the early modeling stages of a female head but when finished I want to animate a lipstick moving across her lips and have the colour transfered to her lips, how on earth would I do this?

Also on a similar theme, I have a pencil and want to animate it drawing and writing.

I get the horrible feeling that its not going to be easy and may even require almost old school frame by frame animation :eek:

Dynamic Paint will be your answer.

Tutorial here
Build here

It is incredibly easy. Good luck!

It’s actually easier than that. There are some really cool things you can do with masking and Blend textures. For an idea of how to do it, you may want to have a look at the Big Buck Bunny production files. In particular, look for the scene where Buck (the rabbit) applies the black marks under his eyes.

Thanks for the replies. I’m glad its not going to be as hard as I thought to do this :slight_smile: