xrforge-v2/src/plugin/janusxr/layout/grid.lua

local grid = {

  --render = function(items)
  --  local jml = ''
  --  local gridsize = tonumber( app.opts.plugin_openbrush_layout_grid_size )
  --  for i,v in pairs(items) do
  --    local url = v.redirect and v.redirect or v.url 
  --    local pos = {x=0,y=0,z=0}
  --    local posStr = pos.x .. ' ' .. pos.y .. ' ' .. pos.z
  --    jml = jml .. '    <link url="' .. url .. '" url_pos="' .. posStr .. '" url_scale="1 1 1" auto_load="true"/>\n'
  --  end
  --  return jml
  --end

  render = function(items)
    local jml = ''
    -- Distance between items in meters. gridsize = 5 means 5m x 5m spacing.
    local gridsize = tonumber(app.opts.plugin_openbrush_layout_grid_size) or 5
    -- Square spiral: Start at (0, 0) right, up, left, down, increasing the step length
    local x = 0
    local z = 0
    local dx = 1
    local dz = 0
    local steps = 1
    local stepsTaken = 0
    local turns = 0
    local index = 0
    for i, v in pairs(items) do
        local url = v.redirect and v.redirect or v.url
        local overlay = v.title:match('#overlay') and true or false
        -- Position current item
        local pos = {
            x = overlay and 0 or x * gridsize,
            y = 0,
            z = overlay and 0 or z * gridsize
        }
        local posStr = pos.x .. ' ' .. pos.y .. ' ' .. pos.z
        local is_nested_room = false
        if is_nested_room then
          jml = jml .. '    <link url="' .. url .. '" url_pos="' .. posStr 
                    .. '" url_scale="1 1 1" auto_load="true"/>\n'
        else
          jml = jml .. '    <object id="' .. url .. '" pos="' .. posStr .. '"/>\n'
        end
        if not overlay then
          index = index + 1
          -- Move to next position in the spiral
          if index < #items then
              x = x + dx
              z = z + dz
              stepsTaken = stepsTaken + 1
              if stepsTaken == steps then
                  stepsTaken = 0
                  -- Rotate clockwise: right -> up -> left -> down
                  local oldDx = dx
                  dx = -dz
                  dz = oldDx
                  turns = turns + 1
                  -- Increase the length after every second turn
                  if turns % 2 == 0 then
                      steps = steps + 1
                  end
              end
          end
        end
    end
    return jml
  end

}

return grid