From 2cd1ec27e0380cecf5408f4d36ee9838611dd8c1 Mon Sep 17 00:00:00 2001
From: "kepler155c@gmail.com" <kepler155c@gmail.com>
Date: Tue, 19 Mar 2019 07:34:03 -0400
Subject: [PATCH] overlay glasses

---
 neural/ores.lua | 84 ++++++++++++++++++++++++++-----------------------
 1 file changed, 44 insertions(+), 40 deletions(-)

diff --git a/neural/ores.lua b/neural/ores.lua
index 08a1dba..c273038 100644
--- a/neural/ores.lua
+++ b/neural/ores.lua
@@ -29,63 +29,67 @@ local targets = {
 local projecting = { }
 
 local function getPoint()
-	local pt = { gps.locate() }
-	return {
-		x = pt[1],
-		y = pt[2],
-		z = pt[3],
-	}
+  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()
 
-    local blocks = { }
-    for _, b in pairs(scanned) do
-      if targets[b.name] then
-        b.wx = math.floor(pos.x + b.x)
-        b.wy = math.floor(pos.y + b.y)
-        b.wz = math.floor(pos.z + b.z)
-        b.id = table.concat({ math.floor(b.wx), math.floor(b.wy), math.floor(b.wz) }, ':')
-        blocks[b.id] = b
+    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
-    end
 
-    for _, b in pairs(blocks) do
-      if not projecting[b.id] then
-        projecting[b.id] = b
-        b.box = canvas.addBox(
-          pos.x - offset.x + b.x + -(pos.x % 1) + .25,
-          pos.y - offset.y + b.y + -(pos.y % 1) + .25,
-          pos.z - offset.z + b.z + -(pos.z % 1) + .25,
-          .5, .5, .5, targets[b.name])
-        b.box.setDepthTested(false)
+      local blocks = { }
+      for _, b in pairs(scanned) do
+        if targets[b.name] then
+          -- track block's world position
+          b.id = table.concat({
+            math.floor(pos.x + b.x),
+            math.floor(pos.y + b.y),
+            math.floor(pos.z + b.z) }, ':')
+          blocks[b.id] = b
+        end
       end
-    end
 
-    for _, b in pairs(projecting) do
-      if not blocks[b.id] then
-        projecting[b.id].box.remove()
-        projecting[b.id] = nil
+      for _, b in pairs(blocks) do
+        if not projecting[b.id] then
+          projecting[b.id] = b
+          b.box = canvas.addBox(
+            pos.x - offset.x + b.x + -(pos.x % 1) + .25,
+            pos.y - offset.y + b.y + -(pos.y % 1) + .25,
+            pos.z - offset.z + b.z + -(pos.z % 1) + .25,
+            .5, .5, .5, targets[b.name])
+          b.box.setDepthTested(false)
+        end
       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
+        if not blocks[b.id] then
+          b.box.remove()
+          projecting[b.id] = nil
+        end
       end
-      offset = pos
-      canvas.recenter()
     end
 
     os.sleep(.5)
@@ -106,4 +110,4 @@ parallel.waitForAny(
   run
 )
 
-canvas:clear()
+canvas.clear()