Reply To: Cloth sim on real world scale models

[Adrian Bellworthy]

I have not heard that said in regard to physics sims. But I would agree.
Modeling, yes. Most definitely try to model to real world scale. However, like you said, Kent did model much larger in HUMAN.

Side note: It does depend on the future use of the model, we tend to model for the project we are working on and real world scale may not be important in this project.
However, the model may have a use in a future project that does need to conform to real world scale. Why remodel when you can reuse?
In the example of HUMAN, I would suggest at the time of course production Kent modeled for the sole purpose of educational content. Of course the final model can always be scaled to the correct size if needed.

Back to the question…
It may be that the scale is not applied, not just on the object with the physics simulation, but also any particle or collision objects for example.

I always find the default for settings like stiffness, damping, collision margin, etc., OK (with some minor tweaking) for larger objects/scenes. For smaller, these will always need much more attention and adjustment. 

There are so many settings in the physics properties, it does take some time to dial in what works best.
Following a physics tutorial doesn’t always produce the same result, if the model/scene is bigger or smaller, the settings will need to be adjusted to compensate.

There may also be settings elsewhere in Blender that are different. In the scene properties the units of measurement may be different, or the gravity is different to the physics property.

To answer the question:
I would say no, because some settings may change the simulation quite considerably. An example of a simple collision system of a ball dropping onto a surface and rolling down a slope, the friction and damping settings can make a difference to how heavy the ball looks, for a larger ball it may look ok, but scaling down to a smaller ball may look odd.

Physics settings IMO, are a per object/scene dilemma.

CORE is due for release s̶o̶o̶n̶  today, check out the all new Fundamentals of Physics course for may cool examples and many settings discussed.