Get Terrain height

[Rick]

Is there a way to get the Terrain height in Lua? I don't see any Terrain specific stuff on the API Reference page.

[macklebee]

assume the same as in LE2:

terrain:GetHeight(x,y) - Retrieves relative height - returned as a value between 0 and 1

terrain:GetElevation(x,y) - Retrieves the terrain height at the specified position. The height will be interpolated between the nearest 4 grid points to provide a very close estimation of the terrain height at any given position.

[Rick]

Those are interesting links. Says I don't have permission to view them Thx.

[macklebee]

hmmm - i must have super secret double permission cuz they work just fine for me.

[Thirsty Panther]

Works for me

[gamecreator]

Sorry to necro this but how do you do this in C?  Anyone have a code example since the functions don't seem to be documented (or invisible for some people again)?  I tried traversing the entities but world->GetEntity() doesn't recognize GetHeight or GetElevation (though I see the functions in Terran.h).

[macklebee]

how are you getting the terrain? It should work if you are properly accessing the terrain. Granted, the GetHeight() does not appear to provide any information anymore, but GetElevation() appears to work just fine.

window = Window:Create("terrain example",0,0,800,600)
context = Context:Create(window)
world = World:Create()
camera = Camera:Create()
camera:SetPosition(0,60,0)
camera:SetRotation(0,45,0)
camera:SetMultisampleMode(8)
pickinfo = PickInfo()
Map:Load("Maps/terrain.map")
for i=0,world:CountEntities()-1 do
	if world:GetEntity(i):GetClass()==Object.TerrainClass then
		terrain=world:GetEntity(i)
		tolua.cast(terrain,"Terrain")
		break
	end
end

camrot = camera:GetRotation()
gx=Math:Round(context:GetWidth()/2)
gy=Math:Round(context:GetHeight()/2)
move = 0
strafe = 0

while window:KeyDown(Key.Escape)==false do
	if window:Closed() then break end
	mouseposition = window:GetMousePosition()
	dx = mouseposition.x - gx
	dy = mouseposition.y - gy
	camrot.x = camrot.x + dy / 10.0
	camrot.y = camrot.y + dx / 10.0
	camera:SetRotation(camrot)
	window:SetMousePosition(gx,gy)
	move = Math:Curve(((window:KeyDown(Key.W)and 1 or 0) - (window:KeyDown(Key.S) and 1 or 0)),move,10)
	strafe = Math:Curve(((window:KeyDown(Key.D)and 1 or 0) - (window:KeyDown(Key.A) and 1 or 0)),strafe,10)
	camera:Move(strafe,0,move)
	
	p = window:GetMousePosition()
	if window:MouseDown(1) then
		pick = camera:Pick(p.x,p.y,pickinfo,9,true)
	end
	
	Time:Update()
	world:Update()
	world:Render()
 
	
	if pick then
		context:SetBlendMode(Blend.Alpha)
		context:DrawText("Height: "..terrain:GetHeight(pickinfo.position.x, pickinfo.position.y), 2, 2)
		context:DrawText("Elevation: "..terrain:GetElevation(pickinfo.position.x, pickinfo.position.z), 2, 22)
		context:SetBlendMode(Blend.Solid)
	end
	context:Sync()
end

 

[gamecreator]

Thank you.  Got it through your code.  I was simply missing the cast.

Terrain *terrain = (Terrain *)world->GetEntity(i);

And in C as well, GetHeight returns 0 (which is not correct) while GetElevation returns a proper height.