overlay glasses

neural/ores.lua

@@ -30,30 +30,44 @@ local projecting = { }
 
 local function getPoint()
   local pt = { gps.locate() }
+  if pt[1] then
     return {
       x = pt[1],
       y = pt[2],
       z = pt[3],
     }
+  end
 end
 
-local offset = getPoint()
+local offset = getPoint() or error('GPS not found')
 local canvas = modules.canvas3d().create()
 
 local function run()
   while true do
-
     -- order matters
     local scanned = modules.scan()
     local pos = getPoint()
 
+    if pos then
+      if math.abs(pos.x - offset.x) +
+         math.abs(pos.y - offset.y) +
+         math.abs(pos.z - offset.z) > 64 then
+        for _, b in pairs(projecting) do
+          b.box.remove()
+        end
+        projecting = { }
+        offset = pos
+        canvas.recenter()
+      end
+
       local blocks = { }
       for _, b in pairs(scanned) do
         if targets[b.name] then
-        b.wx = math.floor(pos.x + b.x)
+          -- track block's world position
-        b.wy = math.floor(pos.y + b.y)
+          b.id = table.concat({
-        b.wz = math.floor(pos.z + b.z)
+            math.floor(pos.x + b.x),
-        b.id = table.concat({ math.floor(b.wx), math.floor(b.wy), math.floor(b.wz) }, ':')
+            math.floor(pos.y + b.y),
+            math.floor(pos.z + b.z) }, ':')
           blocks[b.id] = b
         end
       end
@@ -72,20 +86,10 @@ local function run()
 
       for _, b in pairs(projecting) do
         if not blocks[b.id] then
-        projecting[b.id].box.remove()
+          b.box.remove()
           projecting[b.id] = nil
         end
       end
-
-    if math.abs(pos.x - offset.x) +
-       math.abs(pos.y - offset.y) +
-       math.abs(pos.z - offset.z) > 64 then
-      for _, b in pairs(projecting) do
-        projecting[b.id].box.remove()
-        projecting[b.id] = nil
-      end
-      offset = pos
-      canvas.recenter()
     end
 
     os.sleep(.5)
@@ -106,4 +110,4 @@ parallel.waitForAny(
   run
 )
 
-canvas:clear()
+canvas.clear()