Commits

Cliff Biffle  committed faea47e

Obscured backgrounds can now be reconstructed (CmdB to toggle).

  • Participants
  • Parent commits 7ad17ec

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Files changed (3)

File English.lproj/MainMenu.xib

 							</object>
 						</object>
 					</object>
-					<object class="NSMenuItem" id="302598603">
-						<reference key="NSMenu" ref="649796088"/>
-						<string key="NSTitle">Format</string>
-						<string key="NSKeyEquiv"/>
-						<int key="NSMnemonicLoc">2147483647</int>
-						<reference key="NSOnImage" ref="35465992"/>
-						<reference key="NSMixedImage" ref="502551668"/>
-						<string key="NSAction">submenuAction:</string>
-						<object class="NSMenu" key="NSSubmenu" id="941447902">
-							<string key="NSTitle">Format</string>
-							<object class="NSMutableArray" key="NSMenuItems">
-								<bool key="EncodedWithXMLCoder">YES</bool>
-								<object class="NSMenuItem" id="792887677">
-									<reference key="NSMenu" ref="941447902"/>
-									<string key="NSTitle">Font</string>
-									<string key="NSKeyEquiv"/>
-									<int key="NSMnemonicLoc">2147483647</int>
-									<reference key="NSOnImage" ref="35465992"/>
-									<reference key="NSMixedImage" ref="502551668"/>
-									<string key="NSAction">submenuAction:</string>
-									<object class="NSMenu" key="NSSubmenu" id="786677654">
-										<string key="NSTitle">Font</string>
-										<object class="NSMutableArray" key="NSMenuItems">
-											<bool key="EncodedWithXMLCoder">YES</bool>
-											<object class="NSMenuItem" id="159677712">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Show Fonts</string>
-												<string key="NSKeyEquiv">t</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="305399458">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Bold</string>
-												<string key="NSKeyEquiv">b</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<int key="NSTag">2</int>
-											</object>
-											<object class="NSMenuItem" id="814362025">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Italic</string>
-												<string key="NSKeyEquiv">i</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<int key="NSTag">1</int>
-											</object>
-											<object class="NSMenuItem" id="330926929">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Underline</string>
-												<string key="NSKeyEquiv">u</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="533507878">
-												<reference key="NSMenu" ref="786677654"/>
-												<bool key="NSIsDisabled">YES</bool>
-												<bool key="NSIsSeparator">YES</bool>
-												<string key="NSTitle"/>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="158063935">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Bigger</string>
-												<string key="NSKeyEquiv">+</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<int key="NSTag">3</int>
-											</object>
-											<object class="NSMenuItem" id="885547335">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Smaller</string>
-												<string key="NSKeyEquiv">-</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<int key="NSTag">4</int>
-											</object>
-											<object class="NSMenuItem" id="901062459">
-												<reference key="NSMenu" ref="786677654"/>
-												<bool key="NSIsDisabled">YES</bool>
-												<bool key="NSIsSeparator">YES</bool>
-												<string key="NSTitle"/>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="767671776">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Kern</string>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<string key="NSAction">submenuAction:</string>
-												<object class="NSMenu" key="NSSubmenu" id="175441468">
-													<string key="NSTitle">Kern</string>
-													<object class="NSMutableArray" key="NSMenuItems">
-														<bool key="EncodedWithXMLCoder">YES</bool>
-														<object class="NSMenuItem" id="252969304">
-															<reference key="NSMenu" ref="175441468"/>
-															<string key="NSTitle">Use Default</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="766922938">
-															<reference key="NSMenu" ref="175441468"/>
-															<string key="NSTitle">Use None</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="677519740">
-															<reference key="NSMenu" ref="175441468"/>
-															<string key="NSTitle">Tighten</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="238351151">
-															<reference key="NSMenu" ref="175441468"/>
-															<string key="NSTitle">Loosen</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-													</object>
-												</object>
-											</object>
-											<object class="NSMenuItem" id="691570813">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Ligature</string>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<string key="NSAction">submenuAction:</string>
-												<object class="NSMenu" key="NSSubmenu" id="1058217995">
-													<string key="NSTitle">Ligature</string>
-													<object class="NSMutableArray" key="NSMenuItems">
-														<bool key="EncodedWithXMLCoder">YES</bool>
-														<object class="NSMenuItem" id="706297211">
-															<reference key="NSMenu" ref="1058217995"/>
-															<string key="NSTitle">Use Default</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="568384683">
-															<reference key="NSMenu" ref="1058217995"/>
-															<string key="NSTitle">Use None</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="663508465">
-															<reference key="NSMenu" ref="1058217995"/>
-															<string key="NSTitle">Use All</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-													</object>
-												</object>
-											</object>
-											<object class="NSMenuItem" id="769124883">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Baseline</string>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<string key="NSAction">submenuAction:</string>
-												<object class="NSMenu" key="NSSubmenu" id="18263474">
-													<string key="NSTitle">Baseline</string>
-													<object class="NSMutableArray" key="NSMenuItems">
-														<bool key="EncodedWithXMLCoder">YES</bool>
-														<object class="NSMenuItem" id="257962622">
-															<reference key="NSMenu" ref="18263474"/>
-															<string key="NSTitle">Use Default</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="644725453">
-															<reference key="NSMenu" ref="18263474"/>
-															<string key="NSTitle">Superscript</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="1037576581">
-															<reference key="NSMenu" ref="18263474"/>
-															<string key="NSTitle">Subscript</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="941806246">
-															<reference key="NSMenu" ref="18263474"/>
-															<string key="NSTitle">Raise</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="1045724900">
-															<reference key="NSMenu" ref="18263474"/>
-															<string key="NSTitle">Lower</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-													</object>
-												</object>
-											</object>
-											<object class="NSMenuItem" id="739652853">
-												<reference key="NSMenu" ref="786677654"/>
-												<bool key="NSIsDisabled">YES</bool>
-												<bool key="NSIsSeparator">YES</bool>
-												<string key="NSTitle"/>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="1012600125">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Show Colors</string>
-												<string key="NSKeyEquiv">C</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="214559597">
-												<reference key="NSMenu" ref="786677654"/>
-												<bool key="NSIsDisabled">YES</bool>
-												<bool key="NSIsSeparator">YES</bool>
-												<string key="NSTitle"/>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="596732606">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Copy Style</string>
-												<string key="NSKeyEquiv">c</string>
-												<int key="NSKeyEquivModMask">1572864</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="393423671">
-												<reference key="NSMenu" ref="786677654"/>
-												<string key="NSTitle">Paste Style</string>
-												<string key="NSKeyEquiv">v</string>
-												<int key="NSKeyEquivModMask">1572864</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-										</object>
-										<string key="NSName">_NSFontMenu</string>
-									</object>
-								</object>
-								<object class="NSMenuItem" id="215659978">
-									<reference key="NSMenu" ref="941447902"/>
-									<string key="NSTitle">Text</string>
-									<string key="NSKeyEquiv"/>
-									<int key="NSMnemonicLoc">2147483647</int>
-									<reference key="NSOnImage" ref="35465992"/>
-									<reference key="NSMixedImage" ref="502551668"/>
-									<string key="NSAction">submenuAction:</string>
-									<object class="NSMenu" key="NSSubmenu" id="446991534">
-										<string key="NSTitle">Text</string>
-										<object class="NSMutableArray" key="NSMenuItems">
-											<bool key="EncodedWithXMLCoder">YES</bool>
-											<object class="NSMenuItem" id="875092757">
-												<reference key="NSMenu" ref="446991534"/>
-												<string key="NSTitle">Align Left</string>
-												<string key="NSKeyEquiv">{</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="630155264">
-												<reference key="NSMenu" ref="446991534"/>
-												<string key="NSTitle">Center</string>
-												<string key="NSKeyEquiv">|</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="945678886">
-												<reference key="NSMenu" ref="446991534"/>
-												<string key="NSTitle">Justify</string>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="512868991">
-												<reference key="NSMenu" ref="446991534"/>
-												<string key="NSTitle">Align Right</string>
-												<string key="NSKeyEquiv">}</string>
-												<int key="NSKeyEquivModMask">1048576</int>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="163117631">
-												<reference key="NSMenu" ref="446991534"/>
-												<bool key="NSIsDisabled">YES</bool>
-												<bool key="NSIsSeparator">YES</bool>
-												<string key="NSTitle"/>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-											</object>
-											<object class="NSMenuItem" id="31516759">
-												<reference key="NSMenu" ref="446991534"/>
-												<string key="NSTitle">Writing Direction</string>
-												<string key="NSKeyEquiv"/>
-												<int key="NSMnemonicLoc">2147483647</int>
-												<reference key="NSOnImage" ref="35465992"/>
-												<reference key="NSMixedImage" ref="502551668"/>
-												<string key="NSAction">submenuAction:</string>
-												<object class="NSMenu" key="NSSubmenu" id="956096989">
-													<string key="NSTitle">Writing Direction</string>
-													<object class="NSMutableArray" key="NSMenuItems">
-														<bool key="EncodedWithXMLCoder">YES</bool>
-														<object class="NSMenuItem" id="257099033">
-															<reference key="NSMenu" ref="956096989"/>
-															<bool key="NSIsDisabled">YES</bool>
-															<string key="NSTitle">Paragraph</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="551969625">
-															<reference key="NSMenu" ref="956096989"/>
-															<string type="base64-UTF8" key="NSTitle">CURlZmF1bHQ</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="249532473">
-															<reference key="NSMenu" ref="956096989"/>
-															<string type="base64-UTF8" key="NSTitle">CUxlZnQgdG8gUmlnaHQ</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="607364498">
-															<reference key="NSMenu" ref="956096989"/>
-															<string type="base64-UTF8" key="NSTitle">CVJpZ2h0IHRvIExlZnQ</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="508151438">
-															<reference key="NSMenu" ref="956096989"/>
-															<bool key="NSIsDisabled">YES</bool>
-															<bool key="NSIsSeparator">YES</bool>
-															<string key="NSTitle"/>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="981751889">
-															<reference key="NSMenu" ref="956096989"/>
-															<bool key="NSIsDisabled">YES</bool>
-															<string key="NSTitle">Selection</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
-														<object class="NSMenuItem" id="380031999">
-															<reference key="NSMenu" ref="956096989"/>
-															<string type="base64-UTF8" key="NSTitle">CURlZmF1bHQ</string>
-															<string key="NSKeyEquiv"/>
-															<int key="NSMnemonicLoc">2147483647</int>
-															<reference key="NSOnImage" ref="35465992"/>
-															<reference key="NSMixedImage" ref="502551668"/>
-														</object>
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+					<string>KVDepthView</string>
 					<string>com.apple.InterfaceBuilder.CocoaPlugin</string>
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 			</object>
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 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
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 							<string>selectMeshedQuadRenderer:</string>
 							<string>selectMeshedTriRenderer:</string>
 							<string>selectPointCloudRenderer:</string>
+							<string>toggleBackgroundBuffer:</string>
 							<string>toggleDepthFieldUpdates:</string>
 							<string>toggleLighting:</string>
 						</object>
 							<string>id</string>
 							<string>id</string>
 							<string>id</string>
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 					<object class="NSMutableDictionary" key="actionInfosByName">
 							<string>selectMeshedQuadRenderer:</string>
 							<string>selectMeshedTriRenderer:</string>
 							<string>selectPointCloudRenderer:</string>
+							<string>toggleBackgroundBuffer:</string>
 							<string>toggleDepthFieldUpdates:</string>
 							<string>toggleLighting:</string>
 						</object>
 								<string key="candidateClassName">id</string>
 							</object>
 							<object class="IBActionInfo">
+								<string key="name">toggleBackgroundBuffer:</string>
+								<string key="candidateClassName">id</string>
+							</object>
+							<object class="IBActionInfo">
 								<string key="name">toggleDepthFieldUpdates:</string>
 								<string key="candidateClassName">id</string>
 							</object>

File KVDepthView.h

 @interface KVDepthView : NSOpenGLView <KFKinectDelegate> {
   NSMutableData *rawDepthField;
   NSMutableData *linearDepthField;
+  NSMutableData *backgroundDepthField;
   
   camera_t camera;
   
 @property(copy) void (^renderAction)(NSData *);
 @property(assign) BOOL frozen;
 @property(assign, nonatomic) BOOL lightsOn;
+@property(nonatomic) BOOL useBackgroundBuffer;
 
 - (void) depthFieldUpdated: (KFKinect *)kinect;
 
 
 - (IBAction) toggleDepthFieldUpdates: sender;
 - (IBAction) toggleLighting: sender;
+- (IBAction) toggleBackgroundBuffer: sender;
 @end

File KVDepthView.m

 @end
 
 @implementation KVDepthView
+#pragma mark --- Properties ---
+
+@synthesize rawDepthField;
+@synthesize renderAction;
+@synthesize frozen;
+@synthesize lightsOn;
+@synthesize useBackgroundBuffer;
 
 #pragma mark --- NSView Overrides ---
 
                                                       length: (640 * 480 * sizeof(uint16_t))];
   linearDepthField = [[NSMutableData alloc] initWithBytesNoCopy: calloc(640 * 480, sizeof(GLfloat))
                                                          length: (640 * 480 * sizeof(GLfloat))];
+  backgroundDepthField = [[NSMutableData alloc] initWithBytesNoCopy: calloc(640 * 480, sizeof(GLfloat))
+                                                             length: (640 * 480 * sizeof(GLfloat))];
   [self buildDepthTable];
   [self selectPointCloudRenderer: nil];
 }
   
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   
+  if (useBackgroundBuffer) (self.renderAction)(backgroundDepthField);
   (self.renderAction)(linearDepthField);
   
   [[self openGLContext] flushBuffer];
 
 - (void) depthFieldUpdated: (KFKinect *)kinect {
   if (!self.frozen) {
+    if (useBackgroundBuffer) {
+     [self computeLinearDepthField: backgroundDepthField andFoldUsing: ^(GLfloat x, GLfloat y){ return fmaxf(x,y); }]; 
+    }
     [self computeLinearDepthField: linearDepthField andFoldUsing: ^(GLfloat _, GLfloat y){ return y; }];
     [self setNeedsDisplay: YES];
   }
   [self setNeedsDisplay: YES];
 }
 
-#pragma mark --- Properties ---
-
-@synthesize rawDepthField;
-@synthesize renderAction;
-@synthesize frozen;
-@synthesize lightsOn;
+- (IBAction) toggleBackgroundBuffer: sender {
+  self.useBackgroundBuffer = !self.useBackgroundBuffer;
+  [sender setState: self.useBackgroundBuffer? NSOnState : NSOffState];
+  if (self.useBackgroundBuffer) {
+    memset([backgroundDepthField mutableBytes], 0, 640 * 480 * sizeof(GLfloat));
+  }
+}
 
 @end