Letting a plate(E2) hover at it's current position.

[vortexnl]

I want to let my E2 chip hover at its own altitude, although I want to grab it and reposition his position without him flying back to his old location.

It's for a E2 camera im working on, it's controlled by mouse. and I want to put a thruster on it so I can fly around freely.

[Lyinginbedmon]

Best way to do that would be an upward applyForce to negate the chip's gravity. With gravity negated by the force, the chip would hover in place, not unlike in a vacuum.

[motorbikeking1]

gravity works through vacuums :P

if your not sure on the code, you would need to do something along the lines of

applyforce(Prop:up() * Prop:mass() * gravity())

[Nicolai1]

No, if the plate was upside down it would just apply downward force, this is the code (Working as I've made it before):

@inputs Ent:entity
runOnTick(1)
Ent:applyForce(vec(0, 0, 9.8)*Ent:mass())

[Echo51]

look up gravity on wikipedia.org if the 9.8 isent perfect, it might drop a slighty bit..

[pl0x]

9.81 is gravity. on earth. at sea level. in this universe.

[Bull]

Gmod gravity is not 9.81
Gmod gravity is whatever sv_gravity is.. Which is 600 normally.

There should be an automatic kick in the butt when someone uses "9.8" in a post, when "gravity" is mentioned in the thread on wiremod.com.

edit: *Kick*

[mjmr89]

Unfortunately gravity, acceleration, force, etc does *NOT* work how it should in gmod. Even if you use a figure like 600 somewhere in your calculations, it won't work... I've tried MANY times. There is, however, an upward force needed to counteract gravity for a given mass. I tried to get a formula for this, but it jumps around and is pretty damn erratic. If you have, like you say a camera, you only have to calculate this force once. Something like this:

[highlight=e2]
@inputs Ent:entity
@persist Calibration
runOnTick(1)

Calibration += entity():vel():z()

EE:applyForce(Calibration*vec(0,0,1))

[/highlight]

It will struggle a bit but it will eventually get there. You might want to mess with a multiplier or something on Calibration. Obviously, do this with gravity on. Once it settles and stops moving up and down, save the number using a debugger or something.

You could probably just make one E2 that does this and change the E2 to the weight of the prop you'll end up using + 1 for the weight of the expression that I assume you'll be attaching to said prop.

But when I came into this topic I was thinking about another way to do it.

[highlight=e2]
@inputs ENT

runOnTick(1)

Held = entity()wner:isBeingHeld() #I'm not really sure of the function, whatever tells you if its being frozen or not
Pos = ENTos()
SomeMultiplier = ???

if((~Held & !Held) | first()) #if someone just stopped holding it
{HoldPos = Pos} #make that position it stopped being held at the position to stick to

ENT:applyForce(SomeMultiplier*(HoldPos - Pos - ENT:vel())
[/highlight]

Hope this helps.

EDIT: Forgot about adding in the air friction part of it.

[motorbikeking1]

Some code im using atm is

Force = (TargetPos - Prop:pos()) * 5 - Prop:vel()
Force *= Prop:mass()
Prop:applyForce(Force)

works like a charm, all you need to do is find the correct multiplyer and your there, dunno where i got 5 from lol thats just from code i took from Paper Clip to fiddle around with some stuff.

[Aura]

Just do something like

applyForce(-entity():vel()*entity():mass())