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Calculating position from rotation and offset


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Hello again,

I'm trying to spawn the player onto an element. This element has a non-fixed rotation.

I'm just wondering if the function getPointFromDistanceRotation isn't enough to do this?

Player details can be found here and the ships details are here

I'm currently using this snippet (to try) to get the explained result:

addCommandHandler("boat", function(player, cmd)
  local x, y, z = getElementPosition(player)
  local _, _, r = getElementRotation(player)
  outputChatBox("player pos: "..x..","..y..","..z..","..r, player)

  local ship = createShip(x, y, z, r) -- returns model of pirateship

  local x, y, z = getElementPosition(ship)
  local _, _, r = getElementRotation(ship)
  outputChatBox("ship pos: "..x..","..y..","..z..","..r, player)

  local x, y = getPointFromDistanceRotation(x - 0.1, y - 2.7, 5, r) -- offset included
  outputChatBox("new player pos: "..x..","..y..","..z..","..r, player)
  setElementPosition(player, x, y, 43.7)

What am I'm doing wrong? Do I need to calculate the offset coordinates extra?




Edited by Maurize
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I don't know if I understood you well, anyway: Firstly, try using this function to create the marker at a specific position of the object:

function getPositionFromElementOffset(element,offX,offY,offZ)
    local m = getElementMatrix ( element )  -- Get the matrix
    local x = offX * m[1][1] + offY * m[2][1] + offZ * m[3][1] + m[4][1]  -- Apply transform
    local y = offX * m[1][2] + offY * m[2][2] + offZ * m[3][2] + m[4][2]
    local z = offX * m[1][3] + offY * m[2][3] + offZ * m[3][3] + m[4][3]
    return x, y, z                               -- Return the transformed point

Done that, you can set the player in front the mark that way:

local playerRot = 0 -- you'll need to adjust player rotation
local playerX = markerX + math.sin( math.rad( playerRot ) ) * .6
local playerY = markerY + math.cos( math.rad( playerRot ) ) * .6
setElementPosition( player, playerX, playerY, markerZ+1 )
setElementRotation( player, 0, 0, ( 360-playerRot ) )

If you change the object rotation, you'll also need to calculate the corresponding player's rotation in the pirate ship.

Edited by DNL291
  • Like 1
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