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I'm a little confused(nothing new) on how to have a dynamic object not be affected by gravity. For example have a floating platform that moves between to static object which the player can hope on and off. My platforms slowly fall down (affected by gravity) and for the life of me I cant work out how to stop some objects from being affected by gravity.

Do I need to apply a force or is there a command I'm missing?

Just negate the effect of the default gravity, i.e.

set phy gravity 0, 0, 0
(I may have misspelt the command - check the command files)

@ Philip: I think he only wants to exclude the object (plattform) from the gravity and not disable the whole gravity in the scene!
This is what is written in the help-file for this command:


@ Simwad: I would say that disabling the gravity might solve the problem, but as soon as your "caracter/player" jumps on it (influenced by a seperate "hand-made" gravity) the plattform will move into the same direction as your player is falling (to say it simple: it will fall with your player untill it hits an other object) and this is surely not what you want, right?

You might can use some joints to prevent the platform from falling, but still have it react to changes of the weight that is resting on it (player) and movements. You maybe need to hide this "joint-help-objects" from the scene/eye of the player. The plattform would be connected with some other surrounding static objects which are "holding" to plattform at its location. A spring-like joint is maybe the one that might be usefull for your plattform-thing (no idea, if this is the right sort of joint, but you should have a look at the different sorts of joints to find the one usefull for your problem):


I never used joints so far, so I can't tell you anything more usefull! It was just an idea!


I hope it was at least a bit usefull.

Hoozer

You can use the
PHY SET RIGID BODY KINEMATIC

There is also a demo Kinematic Objects that show it's use.
If you set an object with this property, this is not affected from forces (infinite mass) but you can move it with
PHY SET RIGID BODY KINEMATIC ROTATION
and
PHY SET RIGID BODY KINEMATIC POSITION

Thanks for the feedback guys, I'll have a look into it tonight. Having a quick look at the Kinematic example looks like it holds the answer.

Or, if you just want to disable the default gravity for one object, each game loop add a force to the object that is the inverse of the gravity vector. Job done.