I saw the "tissue roll" made by Draco712, and it requires some lua scripting. I thought about this and made another similar one based on photons.
ID:2192909
There're some problems with it. According to the official wiki, the dcel is supposed to stop the photons right away. But some photons still collide with other particles and disappear. And when I tried to get the particle order of the stacked PHOTs right with Dray, it always get stuck halfway.
PS:How do I link my save directly to the post?