We're currently working on smoke grenades for the game, and we're using particles for it, it's really nice but we have a question. We want to control particles scaterring to not let them go through walls or pilars for instance, like in this image:
We want the particules to stay in the area we've computed (the white limits), is there any way to do it?
You would need to get the position of each particle and then apply collision detection on it. In LÖVE's particleSystem, I don't see any method for getting the particle positions. So you would have to implement an own particle system.
What I'm also considering is to render the particles into a canvas and apply it in my final scene with a mask cropping what I don't want, but I'm afraid it'll be quite strange on the edges, maybe by applying a gradient it'll be acceptable.
But before going this route I wanted to be sure that there's no other solution, so d'ont hesitate if you have any idea!
I have an idea, but I've never done it. You can apply a shader to a particle system. You could draw the area you computed to a texture and multiply it with the particles. Then any particles out side of the computed area would simply be not-visible, yes?
You can use a stencil the shape of your area and then draw your particle system, I'm not sure whether a gradient would work as a stencil to smooth the edges.
