Weighted Button powered by physics

[reepblue]

I'm looking into ways to re-create my floor buttons I've used in the Vectronic Demo. I don't want to rely on triggers this time around but instead have it be reactive to live physics. Here is a rad picture of how I intend to do this,

The idea was to have a slider with a spring attached to prevent the slider joint from collapsing on itself. To test if the button was pressed, I would test the distance from the top model to the base entity. I've tried this with 4.5 and the top kept bouncing. The only thing that worked was using a Kinematic joint, but I couldn't lock it to an axis. I haven't tried this in months, but what would be the best way to go about this and is this do-able in the engine. I hate to ask for help without providing code, but I don't have my attempts anymore.

[Josh]

There are new spring parameters that might help with this:
https://www.leadwerks.com/learn?page=API-Reference_Object_Joint_SetSpring

It sounds like in your case increasing the damping value might help.

[Josh]

Also, if the button does not move around in the scene you can make the parent entity NULL. This doesn't really matter in terms of behavior but it might make life simpler.

[reepblue]

I'll give this a go tonight and let you know how I make out.

[reepblue]

It's a start, might need adjusting later but this is great for VR push buttons.

function Script:Start()
	self.entity:SetMass(1)
	self.entity:SetGravityMode(false)
	local position=self.entity:GetPosition(true)
	self.joint=Joint:Slider(position.x,position.y,position.z,0,-20,0,self.entity,nil)
    self.joint:EnableLimits()
    self.joint:SetLimits(0,1) -- The lower the number, the shorter distance.
	self.joint:SetSpring(1000,1000,self.entity:GetMass())
end

function Script:UpdateWorld()
	if self.joint:GetAngle() >= 0.1 then
	System:Print(self.joint:GetAngle())
	end
end

 

[reepblue]

Just putting this info here in-case someone looks this up:

Add an additional sub-step to prevent the spring from "freaking out" when down.
 

world->Update(2)

Current code that's working very nice.

function Script:Start()
	self.entity:SetMass(1)
	self.entity:SetGravityMode(false)
	local position=self.entity:GetPosition(true)
	self.joint=Joint:Slider(position.x,position.y,position.z,0,-20,0,self.entity,nil)
    self.joint:EnableLimits()
    self.joint:SetLimits(0,0.02)
	self.joint:SetFriction(1000,1000)
	self.joint:SetSpring(2500,2500,50)
end

function Script:UpdateWorld()
	if self.joint:GetAngle() >= 0.01 then
	System:Print(self.joint:GetAngle())
	end
end