Hi there,

I'm currently simulating a piece of chocolate with a caramel filling. The chocolate breaks open and the caramel filling should ooze out while sticking to the chocolate pieces. The MPM solver sounds like a reasonable simulation method.

At first I tried building the scene at real life scale, the piece of chocolate is ~2cm wide. I built a fractured piece of chocolate, MPM colliders, a filling with a "honey" preset etc. The filling itself consists of around 500.000 particles, nothing to write home about.

The problem is that the sim is running extremely slow. Like 1 frame per minute (!!!) max.

I tried a few things but the only thing that helped was to scale up the scene by a factor of 100 so that the piece of chocolate now is more like 2m tall. The amount of particles is still at 500.000 but now the sim runs at 2-3 frames per second. What a difference!

Now the question: Is the MPM solver intended for large scale sims only or did I miss an advanced / hidden setting? I mean I can live with manually scaling up and exporting the downscaled results afterwards, but I would prefer working at the intended scale all the time.

Just started watching this brand new MPM fundamentals video https://www.youtube.com/watch?v=fDmJo3zpb1g [www.youtube.com]

And right at the start it says "...capable of simulating small scale fluids...".

Now I'm excited and will watch this.