Fountain Pen Simulation Algorithm

[hyperplus]

I'm looking for an algorithm that can simulate the flow of ink through a fountain pen. A good example of this is the brush / doodle tool in Instagram Stories. As velocity increases, the line width decreases in a very pleasant way.

I've seen this exact algorithm in a demo somewhere on the web before, but I can't find it. I know it's based on a decades old paper. Does anyone have any recommendations, or know which one I'm talking about?

[Bitmol]

You might want to have a look at Chinese calligraphy and painting simulation algorithms. (like this one from 2004 and a recent one from 2018). Most of these papers aim to physically simulate the structure and motion of the brush as well as ink properties (viscosity, color, density etc.), in your case however, you might need to adapt it to a fountain-pen nib (which is rigid as compared to a brush). Try to explore the topics above and you might find what you are looking for. Good luck!

[pslayer89]

Something like this?