05-1 create a firework
I was tring to create a round shaped but not square shaped firwork. So I added multiple circles in a particle, and put them into certain range with random position. code
05-2 create firework using sin and cos
I tried to make the firework more dynamic so I added sin and cos into the vel and dumping force reandom range. But when I tried to make the background color keep changing color by sin and cos, it failed. I don't know why.... It just looked like a grey color. So I use black for now. code
05-3 create an interesting effect with transparency or by using images as a natural phenomenon or make something really nice looking.
Snow for now. At the begining, I tried to create bubble-like particles by overlaying mutiple transparent circles with different size. But now it just looks like many flat transparent circles. So I modified the speed to make a snow scene. code
Instead making circles become smaller, I enlarge each particle to make an explosion-like effect. Every click creates an explosion. code