Added culling sample.

samples/o3d-webgl/field.js

 /*
  * Copyright 2010, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 54 matching lines @@
 
 /**
  * The size of one element of this field.
  * @type {number}
  */
 o3d.Field.prototype.size = 0;
 
 
 /**
  * Sets the values of the data stored in the field.
- * 
+ *
  * The buffer for the field  must have already been created either through
  * buffer.set or through buffer.allocateElements.
- * 
+ *
  * The number of values passed in must be a multiple of the number of
  * components needed for the field.
- * 
+ *
  * @param {number} start_index index of first value to set.
- * @param {number} values Values to be stored in the buffer starting at index.
+ * @param {!Array.<number>} values Values to be stored in the buffer starting at
+ *     index.
  */
 o3d.Field.prototype.setAt =
     function(start_index, values) {
   this.buffer.lock();
   var l = values.length / this.numComponents;
-  for (var i = 0; i < l; i++) {
+  for (var i = 0; i < l; ++i) {
     for (var c = 0; c < this.numComponents; ++c) {
       this.buffer.array_[
           (start_index + i) * this.buffer.totalComponents + this.offset_ + c] =
               values[this.numComponents * i + c];
     }
   }
   this.buffer.unlock();
   return true;
 };
 
 
 /**
  * Gets the values stored in the field.
- * 
+ *
  * @param {number} start_index index of the first value to get.
  * @param {number} num_elements number of elements to read from field.
- * @return {number}  The values of the field.
+ * @return {!Array.<number>}  The values of the field.
  */
 o3d.Field.prototype.getAt =
     function(start_index, num_elements) {
-  o3d.notImplemented();
+  var values = [];
+  for (var i = 0; i < num_elements; ++i) {
+    for (var c = 0; c < this.numComponents; ++c) {
+      values.push(this.buffer.array_[(start_index + i) *
+          this.buffer.totalComponents + this.offset_ + c]);
+    }
+  }
+  return values;
 };
 
 
 
 /**
  * A field that contains floating point numbers.
  * @constructor
  */
 o3d.FloatField = function() {
   o3d.Field.call(this);
@@ skipping 12 matching lines @@
 /**
  * A field that contains unsigned bytes.
  * @constructor
  */
 o3d.UByteNField = function() {
   o3d.Field.call(this);
 };
 o3d.inherit('UByteNField', 'Field');