Flame particle system

For larger fires, just make the particles rotate about the camera view direction. They should rotate "outwards" from their emission source -- the edge above the source should move upwards.

For smaller flames, you may be better off with using a 2D fluid simulation and rendering the result as a texture.

Quote:

Original post by Katie For larger fires, just make the particles rotate about the camera view direction. They should rotate "outwards" from their emission source -- the edge above the source should move upwards. For smaller flames, you may be better off with using a 2D fluid simulation and rendering the result as a texture.

thanks I think I know what you mean
if I choose the first one I need to calculate the position in view coordinate, but I prefer world coordinate. do you have any idea I can implement in world space including position, velocity and acceleration?

Google for "Smooth Particle Hydrodynamics" (SPH)

The math isn't actually that complicated and you can emulate quite a lot of turbulent effects this way. The problem is usually boring cpu drudge work, like the need to have lots of them, each detecting nearest neighbours etc