Top down movement/aiming.

[Feihc]

I'm working on a gamemode and trying to make a top down kinda view with WASD movement but the player always aiming at the cursor.

I'm using CalcView to view from thirdperson, and trying to use ply:GetCursorAimVector() to trace from the player to the cursor position, but I have a strong feeling I am either doing it wrong, or GetCursorAimVector gets skewed when you mess with CalcView

(inside a player class for the gamemode (Fretta))

function CLASS:CalcView( ply, pos, angles, fov )
 gui.EnableScreenClicker(true)
 local mVec = ply:GetCursorAimVector()
 local trace = {}
 trace.startpos = ply:EyePos()
 trace.endpos = ply:EyePos() + mVec * 9000
 trace.filter = ply
 local tRes = util.TraceLine(trace)
 if tRes.Hit or tRes.HitWorld then
  local cAim = tRes.HitPos --+ Vector(0,0,ply:EyePos().z)
  local tAng = (cAim - ply:EyePos()):Angle()
  debugoverlay.Cross(tRes.HitPos, 32, .05, Color(255,255,255,255))
  debugoverlay.Line(ply:EyePos(), tRes.HitPos, .05)
  ply:SetEyeAngles(tAng)
 end
    local view = {}
    view.origin = pos + Vector(250,0,250)
    view.angles = Angle(45,180,0)
    view.fov = fov
 
    return view
end

The trace is obviously wrong (as i can see from the debugoverlay)

What am I messing up?

[editline]2nd November 2010[/editline]

I've tried also using gui.ScreenToVector(gui.MousePos()) but that doesnt work either.

[-TB-]

Does mVec return a Z value that is anything but 0?

[Kogitsune]

function AngFromScreen( )
  local x, y, ang

  x = ScrW( ) / 2 - gui.MouseX( )
  y = ScrH( ) / 2 = gui.MouseY( )

  ang = math.atan2( y, x )

  return math.deg( ang )
end

pl:SetEyeAngles( Angle( pitch, AngFromScreen( ), 0 ) )

Figuring pitch is probably going to be a mess and will probably involve tracing. Perhaps a simple 2d check for entities to aim at?

local k, v, pos, min, max

for k, v in pairs( ents.GetAll( ) ) do
  if v == pl then
    continue
  end

  if not table.HasValue( proper_entities, v:GetClass( ) ) then
    continue
  end

  min, max = v:GetWorldSpaceAABB( )

  min = min:ToScreen( )
  max = max:ToScreen( )

  if not ( min.x <= x and max.x <= x ) then
    continue
  end

  if not ( min.y <= y and max.y <= y ) then
    continue
  end

  pitch = ( v:GetPos( ) - pl:GetShootPos( ) ):Angle( ).p
  break
end

CursorAimVector is from the player's eye position rather than where CalcView moves it to, afaik.

Of course, none of this is tested, so you would need to mess around with it.

[ralle105]

[lua]
local screenRatio = ScrH()/ScrW()
local FOV = LocalPlayer():GetFOV()
local yaw = FOV*gui.MouseX()/ScrW()-FOV/2
local pitch = (FOV*gui.MouseY()/ScrH()-FOV/2)*screenRatio
[/lua]
Something like that.

[Feihc]

I shoulda mentioned that my camera is at a 45 deg angle downwar, not DIRECTLY top down - so I dont think converting from screen positions will work correctly O.o

[editline]2nd November 2010[/editline]

Got it working.