[lua] Elevator

[Skrakle]

I'm using a brush to make an elevator, while it goes up, it's flickering, like it's trying to drop back down, i would have thought SetGravityMode(false) would have prevented this. Is there way to eliminate this effect?

 

 

Script.Trigger_Delay = 500;			 --int "Triggering delay"
Script.is_active = 0;
Script.timer = 0;

function Script:Start()
self.entity:SetMass(10000)
self.entity:SetGravityMode(false)
self.entity:SetCollisionType(Collision.Scene)
end



function Script:Collision(entity,position,normal,speed)
self:Activate();
end



function Script:Activate()
if (self.is_active == 0) then
self.is_active = 1;
self.timer = Time:GetCurrent() + self.Trigger_Delay;
end
end



function Script:UpdateWorld()
end



function Script:UpdatePhysics()
if (self.is_active == 1) then
 if (Time:GetCurrent() > self.timer) then
	 local pos = self.entity:GetPosition(true);
	 pos.y = pos.y + 0.1 * Time:GetSpeed();
	 self.entity:PhysicsSetPosition(pos.x,pos.y,pos.z,0.2);
 end
end
end

[tjheldna]

Sorry don't have any example code at the moment but I believe you would want to attach the platform to a Slider Joint so the player moves properly with the elevator. This would be especially important if the elevator moved sideways. There may be an example of this in a demo project.

 

http://www.leadwerks.com/werkspace/page/api-reference/_/joint/jointslider-r737

 

Can't see the character very well but he looks cool.

[reepblue]

Sorry don't have any example code at the moment but I believe you would want to attach the platform to a Slider Joint so the player moves properly with the elevator. This would be especially important if the elevator moved sideways. There may be an example of this in a demo project.

 

http://www.leadwerks.com/werkspace/page/api-reference/_/joint/jointslider-r737

 

Can't see the character very well but he looks cool.

 

No. You don't want to use the sliding door script as boxes and players would weigh it down. I had the same issue in my game. You need a non-physics based object that moves. (No mass, no joints). This is my script that I used in Vectronic. Feel free to use it.:

 

import "Scripts/Functions/ReleaseTableObjects.lua"
Script.restinglocation=nil
Script.move=false
Script.movedistance=0 --float "Move Distance"
Script.movespeed=1 --float "Move Speed"
Script.startopened=false --bool "Start Opened"
Script.negitive=false --bool "dev"
-- Sound
Script.opensoundfile=""--path "Open Sound" "Wav File (*wav):wav|Sound"
Script.closesoundfile=""--path "Close Sound" "Wav File (*wav):wav|Sound"
Script.loopsoundfile=""--path "Loop Sound" "Wav File (*wav):wav|Sound"
Script.stopsoundfile=""--path "Stop Sound" "Wav File (*wav):wav|Sound"

function Script:Start()
self.restinglocation = self.entity:GetPosition()
self.iy = self.restinglocation.y

self.targetlocation = Vec3(self.restinglocation.x,self.restinglocation.y + self.movedistance / 100,self.restinglocation.z)
if self.startopened then
self.entity:SetPosition(self.targetlocation)
self.opened=true
end

self.sound={}
if self.opensoundfile~="" then self.sound.open = Sound:Load(self.opensoundfile) end
if self.loopsoundfile~="" then self.sound.loop = Sound:Load(self.loopsoundfile) end
if self.closesoundfile~="" then self.sound.close = Sound:Load(self.closesoundfile) end
if self.stopsoundfile~="" then self.sound.stop = Sound:Load(self.stopsoundfile) end

if self.sound.loop~=nil then
self.loopsource = Source:Create()
self.loopsource:SetSound(self.sound.loop)
self.loopsource:SetLoopMode(true)
self.loopsource:SetRange(50)
end

-- Should always use a dynamic shadow.
self.entity:SetShadowMode(2)
local e = self.entity:CountChildren()
for n=1,e do
--System:Print(n)
cl = n - 1
local c = self.entity:GetChild(cl)
c:SetShadowMode(2)
end

end
function Script:UpdateWorld()
if self.movedistance >= 0 then
self:NormalToggle()
else
self:NegitiveToggle()
end
end
function Script:NormalToggle()
if self.move then
if not self.opened then
if self.iy < self.targetlocation.y then
self.entity:SetPosition(self.restinglocation.x,self.iy,self.restinglocation.z)
self.iy=self.iy + self.movespeed * Time:GetSpeed()/100
elseif self.iy >= self.targetlocation.y then
self.iy = self.targetlocation.y
self.move = false
self.opened=true
self:StopSound()
self.component:CallOutputs("OnOpened")
end
else
if self.iy > self.restinglocation.y then
self.entity:SetPosition(self.restinglocation.x,self.iy,self.restinglocation.z)
self.iy=self.iy - self.movespeed * Time:GetSpeed()/100
elseif self.iy <= self.restinglocation.y then
self.iy = self.restinglocation.y
self.move = false
self.opened=false
self:StopSound()
self.component:CallOutputs("OnClosed")
end
end
end
end
function Script:NegitiveToggle()
if self.move then
if not self.opened then
if self.iy > self.targetlocation.y then
self.entity:SetPosition(self.restinglocation.x,self.iy,self.restinglocation.z)
self.iy=self.iy - self.movespeed * Time:GetSpeed()/100
elseif self.iy <= self.targetlocation.y then
self.iy = self.targetlocation.y
self.move = false
self.opened=true
self:StopSound()
self.component:CallOutputs("OnOpened")
end
else
if self.iy < self.restinglocation.y then
self.entity:SetPosition(self.restinglocation.x,self.iy,self.restinglocation.z)
self.iy=self.iy + self.movespeed * Time:GetSpeed()/100
elseif self.iy >= self.restinglocation.y then
self.iy = self.restinglocation.y
self.move = false
self.opened=false
self:StopSound()
self.component:CallOutputs("OnClosed")
end
end
end
end
function Script:StartLoopSound()
if self.loopsource~=nil then
self.loopsource:SetPosition(self.entity:GetPosition(true))
if self.loopsource:GetState()==Source.Stopped then
self.loopsource:Play()
end
end
end
function Script:StopSound()
if self.sound.stop ~= nil then
self.entity:EmitSound(self.sound.stop)
end

if self.loopsource~=nil then
self.loopsource:Stop()
end
end
function Script:Open()--in
self.opened=false
if not self.opened then
--if not self.move then
self.move = true
self:StartLoopSound()
if self.sound.open then
self.entity:EmitSound(self.sound.open)
end
self.component:CallOutputs("Open")
--end
end
end
function Script:Close()--in
self.opened=true
if self.opened then
--if not self.move then
self.move = true
self:StartLoopSound()
if self.sound.close then
self.entity:EmitSound(self.sound.close)
end
self.component:CallOutputs("Close")
--end
end
end

 

I put the move code in UpdateWorld than UpdatePhysics because the platform goes closer back to it's original resting point better with UpdateWorld.

[Skrakle]

Thanks for the script, it does the same thing as mine when i previously tried SetPosition instead of PhysicsSetPosition. The platform movement is smoother but the character still doesn't follow it unless i keep moving on it. Seems i need to keep the character's physics updated somehow when idling and my player script is in c++ so i'm not sure how to make this work properly.

[reepblue]

I had this issue (But it strangely went away). You can try parenting a pushing trigger upwards or add this:

 

function Script:Collision(entity, position, normal, speed)
if self.move then
if entity:GetKeyValue("type") == "player" then
System:Print("Entity Touching")
self.currentPushForceDir = self.PushForceDir
entity:SetVelocity(self.PushForceDir, true)
end
end
end

 

At the top of the script, add:

 

Script.PushForceDir=Vec3(0,0,0) --Vec3 "Force Direction"
Script.currentPushForceDir=Vec3(0,0,0)

 

The goal is to keep the player moving. Experiment with self.PushForceDir on the y axis. I accidentally found this trying to push the player off of moving platforms. If the collision function is not spiting it's print, then move the pushing to a trigger volume.

[Skrakle]

I managed to find a way to keep the character physics updated by sending a bogus movement and cancelling it out right after. Not sure how it would affect performance but it works perfectly.

 

// when idling
player_entity->model->SetInput(player_entity->rotation.y, 1, 0, 0, false, 1, 0.5, true);
player_entity->model->SetInput(player_entity->rotation.y, 0, 0, 0, false, 1, 0.5, true);

[Einlander]

Want to see something funny? Put something heavy on your elevator, then jump repeatedly on it, it will fall out from under you. You can test this on the fps tutorial.that comes with Leadwerks.

[reepblue]

I guess it was something in the player code. Mine is not the stock FPSPlayer so it may be why mine worked fine. (also it's a bit harder to notice in first person.)

 

Want to see something funny? Put something heavy on your elevator, then jump repeatedly on it, it will fall out from under you. You can test this on the fps tutorial.that comes with Leadwerks.

 

My lua script solves that problem. The issue was updating the player while it was moving.

[CreativeOcclusion]

I used imported model instead of CSG...added sliding door script and have had no problems...fast and easy...

[tjheldna]

platform movement is smoother but the character still doesn't follow it unless i keep moving on it

 

Actually Yes that's exactly why you need to use a joint, the player wont follow the platforms position otherwise. I've created a moving platform using a slider joints and the player follows the platform where ever it goes.

 

Another thing to take into consideration using this method is to create a custom collision type for the platform that doesn't collide with the "Scene" else it can send it off course.

 

There are these scripts in the default MyGame Project.

 

Objects\Physics\Platform.lua

Objects\Physics\PlatformWaypoint.lua

 

 

I can get you the files if you can't find them.

[Skrakle]

Actually Yes that's exactly why you need to use a joint, the player wont follow the platforms position otherwise. I've created a moving platform using a slider joints and the player follows the platform where ever it goes.

 

Another thing to take into consideration using this method is to create a custom collision type for the platform that doesn't collide with the "Scene" else it can send it off course.

 

There are these scripts in the default MyGame Project.

 

Objects\Physics\Platform.lua

Objects\Physics\PlatformWaypoint.lua

 

 

I can get you the files if you can't find them.

 

Found them in Scripts/Objects/Physics, i'll check it out later.

 

Thanks!

[Skrakle]

I can't figure out on how to use the platform.lua script. The problem i'm having is with:

Script.target = "" --entity "Target waypoint"

 

I can't set a target entity from the editor, it's grayed out and i can't seem to manually set one, world:FindEntity is not working, probably due to the fact that the project is c++ and not lua.