Pickinfo and collision types

[Molamar]

Hello@all,

 

according to Aggror Project Saturn Tutorial about the implementation of a enemy turret, i have some problems with the raycast detections and the collision types.

the scene is setup with the fpsplayer prefab, some csg shapes and the fpsautopistol.mdl with a directional light as muzzlefash.

i enhanced the turret script with additional informations from pickinfo class

	if(self.fireRateTimer > self.fireRate) then
	
		local pickinfo = PickInfo()
		local source = self.entity:GetPosition()
		
		local target = Transform:Point(Vec3(0,0,self.WeaponRange),self.entity,nil)
		
		if (self.entity.world:Pick(source, target, pickinfo, 0, true, Collision.Prop)) then
			local text = pickinfo.entity:GetKeyValue("name","default") --the object that was picked
			local hit = pickinfo.entity:GetPosition(true) -- the global position of the object
			local point = self.entity:GetPosition() -- the position of the turret
			local dis = point:DistanceToPoint(hit) --the distance from turret to the object
			
			System:Print(hit)
			System:Print(text)
			System:Print(dis)
			pickinfo.entity:Hide() --so when the entity itself is disappearing, i can figure out which it is ;)
		
		end

When the turret is doing the pick operation the informations which are stored in the hit, point, dis variables looks fine for me, just the text returns "default".(this means the entity has no name property)

My FpsPlayer has a name assigned, so i guess whatever the pick is hitting, it is not the fpsplayer.

i extented the script with the line: pickinfo.entity:Hide() and the first "pick" hits something and after second "pick" the csg shape below my charctercontroller disappers

How can i figure out what was picked(for curiosity)  and then doing the correct collision type for the raycast only intersect with the character controller.

i remember there was table with the collision types but i couldnt find it.

Thanks for any help

 

[macklebee]

Here is the table that for some reason has been removed from the documentation:

If you are trying to only have a collision with the character then you will need to make a new collision type that only interacts with a character using SetResponse(). Then use that new collsiontype with your Pick. See this post for more info:

 

[Molamar]

Thx for your help, i´m half way there i guess, but stumbling the last steps.

SetResponse() is also not documented, or is it me?

Anyway, i wrote the

Collision:SetResponse(10, Collision.Character, Collision.Collide)

in the start function of the turret script.

The same script contains

if (self.entity.world:Pick(source, target, pickinfo, 0, true, 10)) then

is the pick operation in the updateworld function

the self.entity:SetCollisionType(10) is for my case not necessary ?

Because the character model should stay as collision type character and the pick ray is defined as type 10.

I´ve tried some constellations how to setup the scripts, but it still dont work.

 

 

 

 

 

 

 

[macklebee]

SetResponse is not officially documented for some reason but if you search the forum you will find plenty of examples of it. What you are showing should work assuming the endpoints of the World Pick are where you think they are. You may need to place a sphere at the pick position to confirm. Another way to do this would be just pick everything by setting the Pick's collisiontype to '0' then filtering the results by checking the collisiontype/name/etc of the picked entity.

Example:

window = Window:Create()
context = Context:Create(window)
world = World:Create() 
camera = Camera:Create() 
camera:Move(0,1,-5) 
light = DirectionalLight:Create() 
light:SetRotation(35,35,0) 

enemy = Model:Load("Models/Characters/generic/generic.mdl")
enemy:SetPosition(-4,0,0)
enemy:SetRotation(0,90,0)
enemy:SetColor(1,.5,0,1) 
enemy:SetCollisionType(Collision.Character)

player = Model:Load("Models/Characters/generic/generic.mdl")
player:SetPosition(4,0,0)
player:SetColor(0,1,0,1)
player:SetCollisionType(Collision.Character)
player.health = 1000

wall = Model:Box()
wall:SetScale(0.2,1,1)
wall:SetColor(0,0,1,1)
wall:SetCollisionType(Collision.Prop)

toggle1 = 1 
toggle2 = -1

while window:KeyDown(Key.Escape)==false do
	if window:Closed() then break end
	
	if wall:GetPosition().y > 3 then
		toggle1 = -1
	elseif wall:GetPosition().y < -1 then
		toggle1 = 1
	end
	wall:Translate(0,0.01*Time:GetSpeed()*toggle1,0)
	
	if player:GetPosition().y > 3 then
		toggle2 = -1
	elseif player:GetPosition().y < -1 then
		toggle2 = 1
	end
	player:Translate(0,0.02*Time:GetSpeed()*toggle2,0)
	
	Time:Update() 
	world:Update() 
	world:Render() 

	pickinfo = PickInfo() 
	p0 = enemy:GetPosition() -- enemy position
	p1 = p0 + Vec3(0,1.7,0) -- adding height so ray comes from enemy eyes
	p2 = player:GetPosition() 
	p3 = p1 + Vec3(10,0,0) -- 10m ray out from enemy eyes
	pick = world:Pick(p1,p3,pickinfo,0,true,0) -- pick between two defined points
	if pick then
		if pickinfo.entity==player then player.health = player.health - 0.1 end --do damage to player
		d1 = camera:Project(pickinfo.position) -- just to show raycast hitpoint
	end
	d0 = camera:Project(p1) -- just to show raycast startpoint

	context:SetBlendMode(Blend.Alpha)
	context:SetColor(1,0,0,1)
	context:DrawText(string.format("Player Health: %.1f",player.health), 2, 2)
	context:DrawText("Pick: "..string.format("%s", pick),0,20)
	n0 = camera:Project(p0)
	n1 = camera:Project(p2)
	context:DrawText("ENEMY",n0.x,n0.y)
	context:DrawText("PLAYER",n1.x,n1.y)
	if pick then context:DrawLine(d0.x,d0.y,d1.x,d1.y) end
	context:SetColor(1,1,1,1)
	context:SetBlendMode(Blend.Solid)
	context:Sync(true) 
end

 

[Molamar]

Thx for the detailed information and example. it works now