Comment about quantized range and scale

Author: lilleyse

Source/Scene/PointCloud.js

@@ -1225,6 +1225,8 @@ define([
                     var isQuantizedDraco = defined(decodedPositions) && defined(result.POSITION.data.quantization);
                     var isOctEncodedDraco = defined(decodedNormals) && defined(result.NORMAL.data.quantization);
                     if (isQuantizedDraco) {
+                        // Draco quantization range == quantized volume scale - size in meters of the quantized volume
+                        // Internal quantized range is the range of values of the quantized data, e.g. 255 for 8-bit, 1023 for 10-bit, etc
                         var quantization = result.POSITION.data.quantization;
                         var range = quantization.range;
                         pointCloud._quantizedVolumeScale = Cartesian3.fromElements(range, range, range);