added note about how to JS

Assets/RT3script.cs

@@ -3,6 +3,8 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using UnityEngine;
 
+using System.Runtime.InteropServices;
+
 using System.IO;
 
 
@@ -100,18 +102,20 @@ public class RT3script : MonoBehaviour
                 }
 
                 //encode into pixels this camera's coordinates
-                var encodedTransform = new Color[256];
+                var encodedTransform = new Color[32];
                 var tr = cameraList[i].transform.localToWorldMatrix;
-                for (int j = 0; j < 256; j++) {
+                uint floatbits = FloatToIntBits(tr[1,1]);
+                for (int j = 0; j < 32; j++) {
                     //this logic does a bitwise check on the length value at bit j
-                    if ((((int)tr[0,0] >> j) & 1)==1) {
+                    // use little-endian (ends with least significant bit on the right)
+                    if (((floatbits >> ((31)-j)) & 1)==1) {
                         encodedTransform[j] = Color.white;
                     }
                     else {
                         encodedTransform[j] = Color.black;
                     }
                 }
-                outputImage.SetPixels((256*i),outputImage.height-2,256,1, encodedTransform);
+                outputImage.SetPixels((256*i), outputImage.height-2,32,1, encodedTransform);
 
                 //encode into pixels transform matrix for this camera
                 outputImage.Apply();
@@ -126,6 +130,30 @@ public class RT3script : MonoBehaviour
 
             frameCount += 1;
         }
+
+    }
+    // inverse in javascript of this:
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView/setUint32
+    // // Create an ArrayBuffer with 32bits (4 bytes)
+    // const buffer = new ArrayBuffer(4);
+    // const view = new DataView(buffer);
+    // view.setUint32(0, 1057279852); // Max unsigned 32-bit integer
+    // console.log(view.getFloat32(0));
+
+    // Based on this: https://stackoverflow.com/a/16822144
+    [StructLayout(LayoutKind.Explicit)]
+    private struct FloatAndUIntUnion {
+        // The memort layout of this struct looks like this
+        // but both pointers refer to the same memory address.
+        // UInt32Bits: IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
+        // FloatValue: SEEEEEEEEFFFFFFFFFFFFFFFFFFFFFFF
+        [FieldOffset(0)] public uint  UInt32Bits;
+        [FieldOffset(0)] public float FloatValue;
+    }
+    public static uint FloatToIntBits(float value) {
+        FloatAndUIntUnion f2i = default(FloatAndUIntUnion);
+        f2i.FloatValue = value;   // write as float
+        return f2i.UInt32Bits;    // read back as int
     }
 
     void OnDestroy()