See the pics




Particles are somehow hard to get through the corner due to the direction of the red-blue-green thing

if maybe more effective if draw from this direction I think (aka draw ENTRY at first)

done

super_mario
Sorry I have problem save my simulation but it's clear in the pic, I mean when go up, flows tend to turn to the lower side but not the upper side. If it turn to the upper side the gravity can loose it, but now it turn to the lower side, which caused a traffic jam due to the gravity


pilojo
Even you make a smooth one, the game still draw the 3-color pipe particles with a Right Angle！