Maratis forum - How to apply a gravitational force to an object?

Re: How to apply a gravitational force to an object?

dummy@example.com (anael) — Sun, 26 Apr 2015 17:39:52 +0000

1 - name your objects : "earth" and "player"
2 - import the script in the scene :
http://wiki.maratis3d.org/index.php?tit … to_objects

Re: How to apply a gravitational force to an object?

dummy@example.com (blend) — Sun, 26 Apr 2015 13:04:27 +0000

Heres the project: https://drive.google.com/folderview?id= … sp=sharing

Re: How to apply a gravitational force to an object?

dummy@example.com (blend) — Sun, 26 Apr 2015 12:52:42 +0000

It still falls off the side of the earth tho? how do i make the gravity flip?

Re: How to apply a gravitational force to an object?

dummy@example.com (blend) — Sun, 26 Apr 2015 12:25:25 +0000

Thanks very much anael. this help me understand vectors better.

Re: How to apply a gravitational force to an object?

dummy@example.com (anael) — Sun, 26 Apr 2015 12:16:28 +0000

but be sure the origin of hearth and player are centered in the mesh

Re: How to apply a gravitational force to an object?

dummy@example.com (anael) — Sun, 26 Apr 2015 12:15:08 +0000

you need a direction vector, in your code it's all zero.

-- get objects
player = getObject("player")
earth = getObject("earth")

setGravity({0, 0, 0}) -- set current scene gravity to zero

g = 0.98 -- your new hand made gravity force

-- scene update
function onSceneUpdate()
   
    vec = normalize(getPosition(earth) - getPosition(player)) * g
    addCentralForce(player, vec)
    
end

Re: How to apply a gravitational force to an object?

dummy@example.com (blend) — Sun, 26 Apr 2015 11:33:40 +0000

This is what i have but cant get it to work.

-- get objects
player = getObject("player")
earth= getObject("earth")

-- scene update
function onSceneUpdate()

gravity = {0, 0, 0}
setGravity(gravity) -- set current scene gravity

addCentralForce(earth, {0, 0, 0}, "local")
end

end

Re: How to apply a gravitational force to an object?

dummy@example.com (anael) — Sun, 26 Apr 2015 09:36:15 +0000

well, you can first set the gravity to zero with setGravity :
http://wiki.maratis3d.org/index.php?title=SetGravity

and then at each frame add a central force with a vector going from the object to the center of the sphere.
with addCentralForce : http://wiki.maratis3d.org/index.php?tit … ntralForce

How to apply a gravitational force to an object?

dummy@example.com (blend) — Sat, 25 Apr 2015 10:30:13 +0000

How to apply a gravitational force to an object? i want to make a sphere and the player walk 360 around it?