friction between objects

[nelsoncs]

Can objects interact with friction in Leadwerks?

 

As an example, If I drop one cube ontop of another, when I rotate the bottom cube, the top one seems to have no actual interaction with the lower one and does not rotate.

 

I f there was friction between them, I would expect the top cube to rotate based on its points of contact with the lower cube.

 

I have tried SetFriction for both objects and various collision types ( probably not exhaustive). Any suggestions on how to accomplish this?

[cassius]

There was adjustable friction in le2. Don't know about le 3.2.In le2 an object with no friction would slide as though on ice when colliding.

[gamecreator]

Maybe try this to see if it helps:

http://www.leadwerks.com/werkspace/page/documentation/_/command-reference/world/worldsetphysicsdetail-r785

That said, physics still needs a lot of work in Leadwerks so I would advise you to stay away from it for now to save yourself some headaches.

[macklebee]

@ cassius there is a entity:SetFriction command in LE3: http://www.leadwerks.com/werkspace/page/documentation/_/command-reference/entity/entitysetfriction-r142

 

@nelsoncs your cubes have to have a physics body, their masses set greater than 0 or the engine thinks the mesh is static, and you have to use PhysicsSetRotation/PhysicsSetPosition or the physics get broken

function App:Start()

self.window = Window:Create()

self.context = Context:Create(self.window)

self.world = World:Create()

self.camera = Camera:Create()

 

self.camera:Move(0,2,-4)

self.light = DirectionalLight:Create()

self.light:SetRotation(35,35,0)

 

self.ground = Model:Box(10,.1,10)

self.ground:SetColor(0,1,0,1)

local shape = Shape:Box(0,0,0, 0,0,0, 10,.1,10)

self.ground:SetShape(shape)

shape:Release()

 

self.model1 = Model:Box()

self.model1:SetColor(1,0,0,1)

self.model1:SetPosition(0,1,0)

self.model1:SetMass(1)

local shape = Shape:Box(0,0,0, 0,0,0, 1,1,1)

self.model1:SetShape(shape)

shape:Release()

 

self.model2 = Model:Box()

self.model1:SetColor(1,.5,0,1)

self.model2:SetPosition(0,2.0,0)

self.model2:SetMass(1)

local shape = Shape:Box(0,0,0, 0,0,0, 1,1,1)

self.model2:SetShape(shape)

shape:Release()

 

rotY = 0

return true

end

 

function App:Loop()

if self.window:Closed() or self.window:KeyHit(Key.Escape) then return false end

 

self.model1:PhysicsSetRotation(0,rotY,0,.1)

rotY = rotY + 1

if rotY==360 then rotY = 0 end

 

Time:Update()

self.world:Update()

self.world:Render()

self.context:Sync()

 

return true

end

[nelsoncs]

"you have to use PhysicsSetRotation/PhysicsSetPosition" <----- this is absolutely correct, thanks for the info. Without these calls a moving platform has no friction and a very odd collision shape. You can move the platform out from under objects and they hang in mid-air.

[nelsoncs]

addendum: using "PhysicsSet....." made it possible to have a moving surface with objects on top that showed friction and moved reasonably well with the underlying surface. rotating the underlying surface was very very laggy.

 

adding a .phy shape file to the model breaks everything and one can no longer set the rotation or position. so, my current conclusion is I have to use a different physics library, which I am disinclined to do or to drop the project altogether. this is rather disappointing.