"wet map" from temperature

[LarsSonparsson]

I'd like to use temperature channel to mix two materials. Like mixing original and burned wood material. I can do that already, but it only affects the temperature in current frame. So I thought it could be a nice idea to have a channel, that would keep the data where high temperatures have been, so one could use that as a blend mask for materials.

Like wet map behaving in liquid simulations, but getting values from temperature channel and not letting it fade over time.

[Svetlin.Nikolov]

Yup, it's in the TODO list already Adding one more vote to it...