I animated perhaps six scenes with fire. By doing so I learned quite a bit about how fire moves but I was not quite satisfied with these initial hand drawn effects. I can control the outside shape of the fire well enough but the interior texturing was something that was a challenge with paint.
I decided to experiment with creating fire using fractal noise and displacement maps. This was my first attempt an it is indeed better than the hand drawn fore that proceeded it. I still need to figure out how to apply a gradient that will make the fire more transparent as it rises and another gradient that can make the fire slightly darker as it rises. I think this can be done with tracking mattes but I don’t know how to make that work yet. Research is needed.
I am also thinking that it will be nice to hand draw the fire shapes but use the fractal noise inside the flames as the rising texture. I am using expressions for the first time to animate the upward movement. I am hoping I can use existing animation as a matte that the fractal noise animation can show through. I don’t have all the answers yet but I am getting close.
Next week my schedule will open up and I will fill that week with research and experimentation until I have a good method of animating flames. In some cases the hand painted flames look good, so I might combine techniques to get the look I want.