From 13b0384c54a4b509886a0c9f7d83eef2c283a122 Mon Sep 17 00:00:00 2001
From: TreetopFlyer <seth111@gmail.com>
Date: Sat, 10 Jul 2021 11:27:44 -0400
Subject: [PATCH] face and neighbor creation

---
 index.html | 12 +++++++++++-
 region.js  | 48 +++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 50 insertions(+), 10 deletions(-)
diff --git a/index.html b/index.html
index c6c2502..31e382d 100644
--- a/index.html
+++ b/index.html
@@ -19,7 +19,16 @@
     </head>
     <body>
         <canvas></canvas>
+<script type="module">
+import { Region } from "./region.js";
 
+let voxels = [];
+voxels[Region.I(2, 2, 2)] = true;
+voxels[Region.I(3, 2, 2)] = true;
+console.log(Region.Surface(voxels));
+
+</script>
+<!--
 <script type="module">
     import { Scene, THREE } from './scene.js';
 
@@ -134,7 +143,7 @@
     ];
 
 
-
+    /*
     Scene(
     {
         DOM:"canvas",
@@ -149,6 +158,7 @@
         }
     }
     );
+    */
 
 </script>
 
diff --git a/region.js b/region.js
index 8291473..f420ed0 100644
--- a/region.js
+++ b/region.js
@@ -54,27 +54,55 @@ export const Region =
         let yPart = zPart % 16;
         return [yPart, yWhole, zWhole];
     },
-    Update(inVoxels)
+    Surface(inVoxels)
     {
+        function Vert(a)
+        {
+            var vertPointer = voxPointVert[a]
+            if(vertPointer === undefined)
+            {
+                let vert = Region.XYZ(a);
+                vertPointer = vertices.length;
+                voxPointVert[a] = vertPointer;
+                vertPointNeighbors.push([]);
+                vertices.push(vert);
+            }
+            return vertPointer;
+        }
         function Face(a, b, c, d)
         {
-            Edge(a, b);
-            Edge(b, c);
-            Edge(c, d);
-            Edge(d, a);
-        }
-        function Edge(a, b)
-        {
+            let p1 = Vert(a);
+            let p2 = Vert(b);
+            let p3 = Vert(c);
+            let p4 = Vert(d);
 
+            triPointVert.push(p1, p2, p3, p3, p4, p1);
+
+            vertPointNeighbors[p1].push(p2);
+            vertPointNeighbors[p2].push(p1);
+
+            vertPointNeighbors[p2].push(p3);
+            vertPointNeighbors[p3].push(p2);
+
+            vertPointNeighbors[p3].push(p4);
+            vertPointNeighbors[p4].push(p3);
+
+            vertPointNeighbors[p4].push(p1);
+            vertPointNeighbors[p1].push(p2);
         }
 
+        var vertices = [];
+        var voxPointVert = [];
+        var triPointVert = [];
+        var vertPointNeighbors = [];
+
         var i;
         var BA, BU, BC, BR,  TA, TU, TC, TR,  CL, CD, CB;
         for(i=0; i<inVoxels.length; i++)
         {
             if(inVoxels[i])
             {
-                let [x, y, z] = Region.IndexToCoords(i);
+                let [x, y, z] = Region.XYZ(i);
 
                 // bottom: at, "up", corner, right
                 BA = i;
@@ -102,5 +130,7 @@ export const Region =
                 if(!inVoxels[CB]){ Face(BA, BU, BC, BR); }
             }
         }
+
+        return {vertices, voxPointVert, triPointVert, vertPointNeighbors};
     }
 };
