topic MXS: MassFX / PhysX (Max2020) in 3ds Max Programming Forum

MXS: MassFX / PhysX (Max2020)

istan — Thu, 22 Aug 2019 13:43:29 GMT

I have a simple RB box above the ground. In the MassFX simulation tools dialog, it does what I expect - the box falls down. Now I'd like to run the same simulation from MXS.

nvpx.SimulationReset()    -- returns 1
nvpx.GetSimulationState() -- returns 0
nvpx.simulate 1000000.0   -- returns 1
nvpx.GetSimulationState() -- returns 2

Here are my questions:

a) shall 'simulate' work at all? no matter which how huge number I pass, the fn returns immediately with 1

b) what exaclty is the simulation time? is in seconds or is it the high accuray time directly from PhysX?

c) why is the box not falling down in the viewport?

d) if there's a "hidden" TM specifically for PhysX existing, how to gain access to?

Ok - I found something out. An init might be missing, as when I use "SingleStep" in the MassFX dialog and afterwards I do a "simulate", it works! The time parameter seem to be in seconds.

Re: MXS: MassFX / PhysX (Max2020)

ads_royje — Thu, 22 Aug 2019 13:55:44 GMT

Hi @istan ,

indeed, documentation will have to be corrected for this.

To be able to run and stop the simulation:

PxRunSimulation() -- start simulation
PxStopSimulation() -- stop simulation
nvpx.SimulationReset() -- reset simulation to start frame

set:

nvpx.simulate 0

for the default time step, this parameter does not start the simulation, it just sets the time steps.

More info:

https://knowledge.autodesk.com/support/3ds-max/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-Run-and-Bake-an-animation-from-a-MassFx-simulation-using-Maxscript-in-3ds-Max.html

Sorry about that.

Regards,

Re: MXS: MassFX / PhysX (Max2020)

istan — Thu, 22 Aug 2019 14:04:07 GMT

hmm.. yes.. thank you..

But when the simulation was initialized once, 'nvpx.simulate 1' does the simulation steps..

Anyhow, I test how far I can go with the Px() function approch.

Not sure, if I can also move PhysX RBies around, while this simulation is running.