Merge pull request #13 from therabbitwindfall/master

Add setPosition, lookAt to Camera3D and converting between Radians and Degrees in Object3DUtils

src/alternativa/engine3d/core/Camera3D.as

@@ -408,6 +408,29 @@ public class Camera3D extends Object3D {
 		context3D = null;
 	}
 	
+	/**
+	 * Setup Camera3D position using x, y, z coordinates
+	 */	
+
+	public function setPosition(x:Number, y:Number, z:Number):void{
+		this.x = x;
+		this.y = y;
+		this.z = z;
+	}
+
+	/**
+	 *  Camera3D lookAt method
+	 */
+	public function lookAt(x:Number, y:Number, z:Number):void{
+			var deltaX:Number = x - this.x;
+			var deltaY:Number = y - this.y;
+			var deltaZ:Number = z - this.z;
+			var rotX = Math.atan2(deltaZ, Math.sqrt(deltaX * deltaX + deltaY * deltaY));
+			rotationX = rotX - 0.5 * Math.PI;
+			rotationY = 0;
+			rotationZ =  -  Math.atan2(deltaX,deltaY);
+	}
+
 	/**
 	 * @private
 	 */

src/alternativa/engine3d/utils/Object3DUtils.as

@@ -23,6 +23,20 @@ package alternativa.engine3d.utils {
 		private static const toRootTransform:Transform3D = new Transform3D();
 		private static const fromRootTransform:Transform3D = new Transform3D();
 		
+		/**
+		 * @public
+		 * Convert Degress to Radians and Radians to Degrees
+		 */
+
+		public static function toRadians(degrees:Number):Number{
+			return degrees * Math.PI / 180;
+		}
+		
+		public static function toDegrees(radians:Number):Number{
+			return radians * 180 / Math.PI;
+		}
+
+
 		/**
 		 * @private
 		 * Performs calculation of bound box of objects hierarchy branch.