In a diffusion field, we can set out which cells secrete chemicals. And this chemical is usually secreted at the very beginning of the model. I want to ask how to impose restrictions on secretions and don't let cells secrete chemicals at the beginning, but secrete under certain conditions. For instance, when the cells come into contact or reach a certain number of mcs steps.
Attached is a CC3D project based on the bacterium-macrophage demo. The bacterium doesn't start to secrete until MCS 100. It'll take several thousand MCS before the macrophage starts to move. This should give you an idea how to change secretion based on MCS or any other characteristic that you can come up with to identify the particular cell that should be secreting. (Maciek might have a better solution.) File attached: secrete_at_mcs.zip (3.07 KB)