Terrain Grid Points

[Paul Thomas]

Just experimenting and I'm trying to get the terrain grid points from a mouse click/position. Not sure how to go about it yet, just started messing around, and starting to try cameraproject but I don't think that's going to work out. Anyone have any ideas?

[macklebee]

Just experimenting and I'm trying to get the terrain grid points from a mouse click/position. Not sure how to go about it yet, just started messing around, and starting to try cameraproject but I don't think that's going to work out. Anyone have any ideas?

 

where are you trying to do this? in a program or the editor?

 

for a lua program, this gives me the position of a pick for any entity class including terrain:

pick=CameraPick(camera,Vec3(GraphicsWidth()/2,GraphicsHeight()/2,1000.0),0,0)
if pick~=nil then
       pick_posX=pick.position.x
       pick_posY=pick.position.y
       pick_posZ=pick.position.z
end

 

it should also work for bmax as well

[Paul Thomas]

Sorry, I should have updated my post, I tried camerapick once I gave up on cameraproject. Thanks for replying though man.

[Paul Thomas]

Still trying to figure out how to get the terrain grid points from a camera pick position. Still messing around with it, lol. No, in a program, not within the editor.

[Paul Thomas]

Anyone know how to get terrain grid points from a camera pick?

[Paul Thomas]

Never mind, just takes some math.

[macklebee]

Never mind, just takes some math.

 

so you got it? i think everyone would like to see it

[Paul Thomas]

Almost. I'll probably have it completed here in just a few, and I'll post up an example. Wanted to mess with terrain editing while "in-game" and it's going well, just have to finalize some of the math. Grid x=0, y=0 works fine, except that I have the y backwards, same with Grid x=128, y=128 (on a 128x128 terrain). Grid x=0, y=128 and Grid x=128, y=0, I have backwards, lol. So click 0, 128 raises the terrain over at 128, 0.

[Paul Thomas]

Now that I'm done feeling stupid, here it is, after I realized no math was really required.

 

Gather terrain resolution from your sandbox scene or use createterrain.

 

local pick:tpick
local grid:tvec3
local height:float
local terrain:tterrain

if mousehit(1)
 pick = camerapick(camera, vec3(mousex(), mousey(), 1000.0), 0, 0)
   if pick <> null and tterrain(pick.entity)
     terrain = tterrain(pick.entity)
     grid = pick.position

     grid.x = grid.x + ((-terrainResolution / 2) + terrainResolution)
     grid.z = grid.z + ((-terrainResolution / 2) + terrainResolution)

     height = terrainheight(terrain, grid.z, grid.x)
     setterrainheight(terrain, grid.z, grid.x, height + 0.001)
   endif
endif

 

That will edit the terrain while playing around with your program.

 

Or

 

terrain.resolution

 

For BlitzMax

[macklebee]

nice.

[Josh]

TerrainHeight will return the height at a specific grid point. Terrain elevation will return an interpolated height at a 3D position in global coordinates.

[Paul Thomas]

Yeah, going to start experimenting with TerrainElevation instead, since using TerrainElevation was the only way to make my radius tool work correctly (drawn based on terrain height). I have a fairly smooth terrain editor so far, but I still have to work on providing radius (inner and outer). My calculations at the moment are way off.

[Paul Thomas]

[Josh]

That looks familiar.

[Paul Thomas]

lol. I'd like to mimic most of the 2.28 sandbox and then continue to build it to be more targeted for my project. Yes, I'm reinventing the wheel, but I can't build upon the LE sandbox. Project targeted features such as changing the time of day, visual cloud layer manipulation, eventually weather, and so forth.

 

If the original LE sandbox was a module or available for purchase, that would be fantastic, but at the moment I'll have to work on this enough to fit my projects needs.

[Josh]

You can do quite a bit to the 2.3 editor with scripts.

[Paul Thomas]

Hmm

[TylerH]

Lol E.C.

 

It would be cool if we could add new toolbar, UI, etc. functionality to the 2.3 Editor via scripts.

 

Similar to how the InitGrid works per-entity, but more so on a game/editor level.

[L B]

I'd be quite interested in seeing the code for the radius drawing.

Nice job, by the way.

[Paul Thomas]

For the actual red radius that follows the terrain?

 

BlitzMax

 

In loop somewhere:

pick = camerapick(camera, vec3(mousex(), mousey(), 1000.0), 0, 0)
 if pick <> null and tterrain(pick.entity)
   createradiusmesh(tterrain(pick.entity), pick.position.x, pick.position.y, pick.position.z)
 endif

 

The above could be simplified, it was final code after testing purposes, but never polished up.

 

function createradiusmesh(terrain:tterrain, x:float, y:float, z:float)
   if radiusmesh freeentity(radiusmesh)
 radiusmesh = createmesh()
 entitycolor(radiusmesh, vec4(1.0, 0.0, 0.0, 1.0))
 radiussurface = createsurface(radiusmesh)

   for local i:int = 1 to 360
     local px:float = x + cos(i) * radius
     local pz:float = z + sin(i) * radius
     local h:float = terrainelevation(terrain, pz, px)
     addvertex(radiussurface, vec3(px, h, pz))
   next

 radiussurface.mode = GL_LINE_LOOP
 updatemesh(radiusmesh)
 entityshadowmode(radiusmesh, false)
endfunction

 

Again, can be polished up, and you need a tmesh/tsurface for the above. I'm not really sure how to do this with the current C# headers, have to still try the header out, just haven't had the time.

 

Code above was also rewritten for this forum instead of copy and pasted, so there could be mistakes but it looks correct.

 

And thanks