To
make a fire like this:
First, creat a few textures
as blow:
Next, use the textures to
make a material as blow in Unreal:
Then, using the materials
to make Particlesystem as blow in Unreal:
What I learned:
1. Use SubImageIndex's ConstantCure to make particle's shape and opacity change through its life. (you can start and end at any number out of the 16 sub images)
2. Use Linear_Bland mode (not randoem_blend) so that the SubImage of the alpha rotate in order.