Initial work on background visualization

XIONControlPanel/Utilities/NSValue+XIONAdditions.h

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+//
+//  NSValue+XIONAdditions.h
+//  XIONControlPanel
+//
+//  Created by Charles Magahern on 12/29/15.
+//  Copyright © 2015 XION. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <GLKit/GLKit.h>
+
+@interface NSValue (XIONAdditions)
+
+- (instancetype)initWithGLKMatrix3:(GLKMatrix3)matrix;
+- (instancetype)initWithGLKMatrix4:(GLKMatrix4)matrix;
+
++ (instancetype)valueWithGLKMatrix3:(GLKMatrix3)matrix;
++ (instancetype)valueWithGLKMatrix4:(GLKMatrix4)matrix;
+
+- (GLKMatrix3)GLKMatrix3Value;
+- (GLKMatrix4)GLKMatrix4Value;
+
+@end

XIONControlPanel/Utilities/NSValue+XIONAdditions.m

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+//
+//  NSValue+XIONAdditions.m
+//  XIONControlPanel
+//
+//  Created by Charles Magahern on 12/29/15.
+//  Copyright © 2015 XION. All rights reserved.
+//
+
+#import "NSValue+XIONAdditions.h"
+
+@implementation NSValue (XIONAdditions)
+
+- (instancetype)initWithGLKMatrix3:(GLKMatrix3)matrix
+{
+    return [self initWithBytes:&matrix objCType:@encode(GLKMatrix3)];
+}
+
+- (instancetype)initWithGLKMatrix4:(GLKMatrix4)matrix
+{
+    return [self initWithBytes:&matrix objCType:@encode(GLKMatrix4)];
+}
+
++ (instancetype)valueWithGLKMatrix3:(GLKMatrix3)matrix
+{
+    return [[[self class] alloc] initWithGLKMatrix3:matrix];
+}
+
++ (instancetype)valueWithGLKMatrix4:(GLKMatrix4)matrix
+{
+    return [[[self class] alloc] initWithGLKMatrix4:matrix];
+}
+
+- (GLKMatrix3)GLKMatrix3Value
+{
+    GLKMatrix3 mat;
+    [self getValue:&mat];
+    return mat;
+}
+
+- (GLKMatrix4)GLKMatrix4Value
+{
+    GLKMatrix4 mat;
+    [self getValue:&mat];
+    return mat;
+}
+
+@end

XIONControlPanel/Utilities/XIONControlPanel-Bridging-Header.h

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+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//
+
+#import "NSValue+XIONAdditions.h"