From 32c436f40a3dfcaefcd3384d03c383b6ebb9156e Mon Sep 17 00:00:00 2001
From: TreetopFlyer <seth111@gmail.com>
Date: Mon, 5 Jul 2021 20:51:08 -0400
Subject: [PATCH] setup

---
 index.html | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 region.js  | 76 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 174 insertions(+)
 create mode 100644 index.html
 create mode 100644 region.js
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..9d8c7f8
--- /dev/null
+++ b/index.html
@@ -0,0 +1,98 @@
+<!doctype html>
+<html>
+    <head>
+        <style>
+            html, body
+            {
+                margin:0;
+            }
+            canvas
+            {
+                position:absolute;
+                top:0;
+                left:0;
+                display:block;
+                width:100%;
+                height:100%;
+            }
+        </style>
+    </head>
+    <body>
+        <canvas></canvas>
+<script type="module">
+import { Region, Kernel } from "./region.js";
+
+let r = Region.Create();
+let filler = (x, y, z)=>
+{
+    r.filled.push(Region.I(x, y, z));
+};
+filler(1, 1, 1);
+Kernel.Loop(Kernel.Corners, [1, 1, 1], filler);
+Kernel.Loop(Kernel.Cardinal, [1, 1, 1], filler);
+
+Region.Surface(r);
+</script>
+<script type="module">
+
+import * as T from          'http://esm.sh/three';
+import { OrbitControls } from 'http://esm.sh/three/examples/jsm/controls/OrbitControls.js';
+
+const renderer = new T.WebGLRenderer({canvas:document.querySelector("canvas")});
+const scene = new T.Scene();
+const camera = new T.PerspectiveCamera(80, 2, 0.1, 10);
+const light = new T.DirectionalLight(0xFFFFFF, 1);
+const geometry = new T.BoxGeometry(1, 1, 1);
+const shader = new T.MeshPhongMaterial({color:0xFFCC00});
+const object = new T.Mesh(geometry, shader);
+
+const controls = new OrbitControls(camera, renderer.domElement);
+controls.update();
+
+scene.add(light);
+scene.add(object);
+
+light.position.set(-1, 2, 4);
+camera.position.set(0, 0, 2);
+
+let dirty = false;
+const update = inTime =>
+{
+    let timeNew = new Date();
+    let timeDelta = timeNew - inTime;
+
+    let delta = timeDelta * 0.001;
+    object.rotation.x += delta;
+
+    controls.update();
+
+    dirty = true;
+
+    setTimeout(()=>update(timeNew), 100);
+}
+
+const render = inTime =>
+{
+    if(dirty)
+    {
+        renderer.render(scene, camera);
+        dirty = false;
+    }
+    requestAnimationFrame(render);
+}
+
+const resize = () =>
+{
+    let canvas = renderer.domElement;
+    camera.aspect = canvas.clientWidth / canvas.clientHeight;
+    camera.updateProjectionMatrix();
+    renderer.setSize(canvas.clientWidth, canvas.clientHeight, false);
+};
+
+window.addEventListener("resize", resize);
+resize();
+render(0);
+update(new Date());
+</script>
+    </body>
+</html>
\ No newline at end of file
diff --git a/region.js b/region.js
new file mode 100644
index 0000000..511da41
--- /dev/null
+++ b/region.js
@@ -0,0 +1,76 @@
+export const Kernel = 
+{
+    Corners:
+    [
+        [ 1,  1, -1],
+        [ 1, -1, -1],
+        [-1,  1, -1],
+        [-1, -1, -1],
+        [ 1,  1,  1],
+        [ 1, -1,  1],
+        [-1,  1,  1],
+        [-1, -1,  1]
+    ],
+    Cardinal:
+    [
+        [ 1,  0,  0],
+        [ 0,  1,  0],
+        [-1,  0,  0],
+        [ 0, -1,  0],
+        [ 0,  0,  1],
+        [ 0,  0, -1]
+    ],
+    Loop(inList, inVector, inHandler)
+    {
+        for(let i=0; i<inList.length; i++)
+        {
+            let delta = inList[i];
+            if(inHandler(inVector[0]+delta[0], inVector[1]+delta[1], inVector[2]+delta[2]))
+            {
+                return;
+            }
+        }
+    }
+};
+export const Region = 
+{
+    Create()
+    {
+        return {filled:[]};
+    },
+    I(inX, inY, inZ)
+    {
+        return inX + inY*32 + inZ*1024;
+    },
+    XYZ(inI)
+    {
+        let zWhole = Math.floor(inI / 1024);
+        let zPart = inI % 1024;
+        let yWhole = Math.floor(zPart / 32);
+        let yPart = zPart % 32;
+        return [yPart, yWhole, zWhole];
+    },
+    Surface(inRegion)
+    {
+        let surface = [];
+        inRegion.filled.forEach(inIndex =>
+        {
+            let coords = Region.XYZ(inIndex);
+            Kernel.Loop(Kernel.Corners, coords, (inX, inY, inZ)=>
+            {
+                let index = Region.I(inX, inY, inZ);
+                if(inRegion.filled[index] === undefined)
+                {
+                    console.log(inX, inY, inZ, "surface");
+                    surface.push(inIndex);
+                    return true;
+                }
+                else
+                {
+                    console.log(inX, inY, inZ, "filled");
+                }
+            });
+        });
+        return surface;
+    }
+};
