SetElevation

[Slimwaffle]

I am wondering what the correct way to use this Undocumented command is? I am trying to make digging scripts for my game. I will post the code here. If I use SetElevation I get an error saying argument 5 needs to be a boolean and if I use SetHeight nothing changes and the game crashes. Getting the elevation works fine setting it is the issue. I want to be able to raise and lower the ground in game.

Quote

--Digging Script
	if window:KeyHit(Key.PageUp) then
	local ELPOS = self.entity:GetPosition()

	raise = terrain:GetElevation(ELPOS.x,ELPOS.y)
	terrain:SetElevation(ELPOS.x,ELPOS.y, raise + 10)
	System:Print(raise)
	end

 

 

[SpiderPig]

In C++ the syntax is this;

void SetElevation(const int x, const int y, const float elevation, const bool update);

Try this;

terrain:SetElevation(ELPOS.x,ELPOS.y, raise + 10, true)

I'm not sure why it says argument 5... there's only 4 in C++.

[Slimwaffle]

So doing this stopped the crashing but its still not changing the terrain elevation.

[SpiderPig]

I remember trying this ages ago and that one of the functions to set height didn't work.  Have you tried SetHeight() with the last argument as true? (In C++ it's false by default)

terrain:SetHeight(ELPOS.x,ELPOS.y, raise + 10, true)

 

[Slimwaffle]

Same thing again stops the crashing but doesn't actually change anything

[SpiderPig]

I'm not sure then sorry.  Maybe it's something Josh can answer.  I remember trying to get it to work but can't actually remember if I succeeded or not...

[Slimwaffle]

Its all good thanks anyway mate. I will have to just wait.

[macklebee]

The height value in SetHeight() is normalized from 0 to 1 where 1 is equal to the max altitude of the terrain. Altitude of the terrain is set by SetScale() via code or via the Editor terrain settings, so you would need to normalize the height you want in regards to the max altitude being equal to 1. Another thing to keep in mind: a terrain position is not the same as the world position. For example: on a 64m x 64m terrain, the world origin (0,0,0) would be located at X=32 & Z =32 on a flat terrain when using SetHeight().

Example showing SetHeight() in action:

window = Window:Create("terrain example",0,0,800,600,Window.Titlebar+Window.Center)
context = Context:Create(window)
world = World:Create()
camera = Camera:Create()
camera:SetPosition(0,5,-5)
camera:SetMultisampleMode(8)
skybox = Texture:Load("Materials/Sky/skybox_texture.tex")
camera:SetSkybox(skybox)
light = DirectionalLight:Create()
light:SetRotation(35,35,0)

terrain = Terrain:Create(64,true)
terrain:SetLayerTexture(0, Texture:Load("Materials/Developer/Bluegrid.tex"), 0)
terrain:SetScale(1,100,1)

ball = Model:Sphere(32)
ballmat = Material:Load("Materials/Developer/Orangegrid.mat")
ball:SetMaterial(ballmat)
ball:SetScale(4,4,4)
shape = Shape:Sphere(0,0,0, 0,0,0, 1,1,1)
ball:SetShape(shape)
shape:Release()
ball:SetCollisionType(Collision.Prop)
ball:SetSweptCollisionMode(true)
ball:SetPosition(24,6,0)
ball:SetMass(1)

camera:Point(ball)

while window:KeyDown(Key.Escape)==false do
	if window:Closed() then break end
	
	pos = ball:GetPosition(true)
	camera:SetPosition(pos.x,6,pos.z-10)
	camera:Point(ball)
	
	if terrain~=nil then
		for x = 0, 64  do
			local y = Time:Millisecs()/600
			for z = 0, 64 do
				local height = math.sin(y+x) / 40
				terrain:SetHeight(x,z,height)
			end
		end
		terrain:UpdateNormals()
	end
 
	Time:Update()
	world:Update()
	world:Render()
	
	context:Sync(true)
end

 

[Slimwaffle]

Even if I simply use;

terrain:SetScale(1,100,1)

if window:KeyDown(key.PageUP) then

terrain:SetHeight(512,512, 10)

end

Nothing Happens. On a 1024 x 1024 map this should be affecting 0,0. But there is no change. Even adding in;

terrain:UpdateNormals()
Time:Update()
world:Update()
world:Render()

does nothing to help. Even if I system print the height for 0, 0 there is change but you can't physically see it in the world.

[macklebee]

Did you try my example? Does it work for you? You are not giving us enough information to determine if its something you are doing wrong or its a problem with LE. What version are you using? Give us a simple example to try. 

And again, the height value is on scale of 0 to 1. 

This simple example works for me:

window = Window:Create("terrain example",0,0,800,600,Window.Titlebar+Window.Center)
context = Context:Create(window)
world = World:Create()
camera = Camera:Create()
camera:SetPosition(0,30,-30)
camera:SetRotation(45,0,0)
camera:SetMultisampleMode(8)
light = DirectionalLight:Create()
light:SetRotation(35,35,0)

terrain = Terrain:Create(64,true)
terrain:SetLayerTexture(0, Texture:Load("Materials/Developer/Bluegrid.tex"), 0)
terrain:SetScale(1,10,1)

math.randomseed(Time:Millisecs())

while window:KeyDown(Key.Escape)==false do
	if window:Closed() then break end
	
	if window:KeyHit(Key.Space) then
		terrain:SetHeight(math.random(0,64),math.random(0,64),1)
		terrain:UpdateNormals()
	end
 
	Time:Update()
	world:Update()
	world:Render()
	
	context:SetBlendMode(Blend.Alpha)
	context:DrawText("Press SPACE to raise a random terrain point",2,2)
	context:SetBlendMode(Blend.Solid)
	context:Sync(true)
end

[Slimwaffle]

Sorry I will have a crack at this again later today and post my code here.

[macklebee]

On 8/31/2018 at 6:11 PM, slimwaffle said:

Sorry I will have a crack at this again later today and post my code here.

slimwaffle - is this resolved or are you still having issues getting a terrain to deform? If so, post your example so we can try to replicate the issue.

 It's called being friendly.  - macklebee

[Slimwaffle]

The only way I was able to make the code work an manipulate the terrain was with this

ELPOS = self.entity:GetPosition()
	if window:KeyHit(Key.L) then
	raise = terrain:GetScale(true)
	terrain:SetScale(raise + 1)
	System:Print(raise)
	
	end

But now I have to figure out how to rewrite it to do it only at my players location. And there is a bug that makes me fall through the map after terrain has be manipulated. But the only command that you can actually see the change happening is using terrain:SetScale() . 

Sorry for the lack of response. Been super busy prepping this project for release.

[Slimwaffle]

GetHeight works when I system Print.

SetHeight works when I system print.

GetElevation works using system print.

SetElevation work using system print.

SetScale is the only one I can see that actually changes in game.

However I could be wrong. Because I think that I might not be converting. the player:GetPosition() correctly for accessing terrain.