Phisics Coder's question

[Kjelle69]

Is there a way to turn off "NDB_NewtonBodySetTransformCallback body"

I want to position and rotate boxes, but I need to turn on the callback for it to rotate, but I want the boxes to not be able to move. could the next version have a command to turn off callbacks?
I can set the mass to 100000 or something, but the main reason is it might be slowing down the program.

Without the callback on, the box is created and positioned, but not rotated.
EDIT: I guess rotating the object manually works too without the callback on

Phisics Coder- you posted this question on the TGC board... I'm not sure what you're asking... could you please explain?

[Physicscoder]

Cool forums! I like the colors and format

Since I posted that, I've found a work-around.

I wanted to turn on the transform callback for one frame to rotate the body, and then turn off the callback so the body remains solid and unmovable.

Now, I think it was the NDB_NewtonBodySetForceAndTorqueCallback that had to be off for the body to remain still during collisions.

[Kjelle69]

thanks for posting!

yep, that should do it.

you could also try other things... like dynamically changing the object mass (make it really heavy when you don't want it to move).

to be honest I've never tried changing the mass at runtime, but it would probably work.

[zircher]

I'll need to do something similar with buoyancy where I change it on the fly so that a 'dead' player will sink to the ground instead of getting back up to their feet.
--
TAZ

[Kjelle69]

zircher - I've had some success with adjusting buoyancy on the fly in my demo testing.

There are 2 easy ways. one is to simply turn off the buoyancy for a body (NDB_BodySetBouyancy)

Another way is to set the buoyancy plane to something like a very low point (below the floor).

Possibly the most interesting way, is to set custom Liquid settings for each body, and then change the Fluid Density on the fly, for each body. this would give you a LOT of control over fine-tuning the buoyancy in real-time.