diff --git a/src/editor.c b/src/editor.c
index 3becdc32..24c80e2d 100644
--- a/src/editor.c
+++ b/src/editor.c
@@ -27,6 +27,8 @@
 
 #define ED_GL_BACKGROUND_COLOR  GLW_BACKGROUND_COLOR
 
+#define ED_BONE_COLOR           0xffff00
+
 typedef struct editor {
   glwWin *win;
   float cameraAngleX;
@@ -34,20 +36,37 @@ typedef struct editor {
   float cameraDistance;
   int newImId;
   int showBoneChecked;
+  int showBallChecked;
+  int showMeshChecked;
   int width;
   int height;
   int mode;
-  int glLeft;
-  int glTop;
-  int glWidth;
-  int glHeight;
-  int mouseX;
-  int mouseY;
+  int renderLeft;
+  int renderTop;
+  int renderWidth;
+  int renderHeight;
+  int moveMouseX;
+  int moveMouseY;
   bmesh *bm;
 } editor;
 
 #include "../data/bmesh_test_2.h"
 
+static int mouseInRenderRect(glwWin *win) {
+  editor *ed = glwGetUserData(win);
+  return glwPointTest(glwMouseX(win), glwMouseY(win),
+    ed->renderLeft, ed->renderTop,
+    ed->renderWidth, ed->renderHeight, 0);
+}
+
+static int drawBmeshBone(bmesh *bm, bmeshBone *bone) {
+  glColor3f(glwR(ED_BONE_COLOR), glwG(ED_BONE_COLOR), glwB(ED_BONE_COLOR));
+  bmeshBall *firstBall = bmeshGetBall(bm, bone->firstBallIndex);
+  bmeshBall *secondBall = bmeshGetBall(bm, bone->secondBallIndex);
+  drawCylinder(&firstBall->position, &secondBall->position, 0.1, 36, 24);
+  return 0;
+}
+
 static void display(glwWin *win) {
   editor *ed = glwGetUserData(win);
   
@@ -85,15 +104,25 @@ static void display(glwWin *win) {
       int glWinY = glwImNextY(win);
       int bottomY = y + height - ED_TOOLBAR_HEIGHT;
       glwImBottomBar(win, GEN_ID, x, bottomY, width, ED_TOOLBAR_HEIGHT);
-      ed->showBoneChecked = glwImCheck(win, GEN_ID, x + ED_SPACING + ED_SPACING,
+      ed->showBallChecked = glwImCheck(win, GEN_ID, x + ED_SPACING + ED_SPACING,
         bottomY + (ED_TOOLBAR_HEIGHT - glwImLineHeight(win)) / 2 + 2,
-        "Show Bone",
+        "Ball",
+        ed->showBallChecked);
+      ed->showBoneChecked = glwImCheck(win, GEN_ID,
+        glwImNextX(win) + ED_SPACING,
+        bottomY + (ED_TOOLBAR_HEIGHT - glwImLineHeight(win)) / 2 + 2,
+        "Bone",
         ed->showBoneChecked);
+      ed->showMeshChecked = glwImCheck(win, GEN_ID,
+        glwImNextX(win) + ED_SPACING,
+        bottomY + (ED_TOOLBAR_HEIGHT - glwImLineHeight(win)) / 2 + 2,
+        "Mesh",
+        ed->showMeshChecked);
       
-      ed->glLeft = x + 1;
-      ed->glTop = glWinY;
-      ed->glWidth = width - 3;
-      ed->glHeight = bottomY - glWinY;
+      ed->renderLeft = x + 1;
+      ed->renderTop = glWinY;
+      ed->renderWidth = width - 3;
+      ed->renderHeight = bottomY - glWinY;
 
       if (0 == ed->bm) {
         bmeshBall ball;
@@ -122,19 +151,19 @@ static void display(glwWin *win) {
       }
       
       glEnable(GL_SCISSOR_TEST);
-      glScissor(ed->glLeft, ED_SPACING / 2 + ED_TOOLBAR_HEIGHT + 1,
-        ed->glWidth, ed->glHeight);
+      glScissor(ed->renderLeft, ED_SPACING / 2 + ED_TOOLBAR_HEIGHT + 1,
+        ed->renderWidth, ed->renderHeight);
       glPushMatrix();
       glTranslatef(x + 1, glWinY, 0);
       
       glColor3f(glwR(ED_GL_BACKGROUND_COLOR),
         glwG(ED_GL_BACKGROUND_COLOR),
         glwB(ED_GL_BACKGROUND_COLOR));
-      glRecti(0, 0, ed->glWidth, ed->glHeight);
+      glRecti(0, 0, ed->renderWidth, ed->renderHeight);
       
       glMatrixMode(GL_PROJECTION);
       glLoadIdentity();
-      gluPerspective(60.0f, (float)ed->glWidth / ed->glHeight, 1, 1000);
+      gluPerspective(60.0f, (float)ed->renderWidth / ed->renderHeight, 1, 1000);
       glMatrixMode(GL_MODELVIEW);
       glLoadIdentity();
       glPushMatrix();
@@ -146,7 +175,23 @@ static void display(glwWin *win) {
       
       glEnable(GL_LIGHTING);
       glEnable(GL_CULL_FACE);
-      bmeshDraw(ed->bm);
+      
+      if (ed->showBallChecked) {
+        
+      }
+      
+      if (ed->showBoneChecked) {
+        int index;
+        for (index = 0; index < bmeshGetBoneNum(ed->bm); ++index) {
+        bmeshBone *bone = bmeshGetBone(ed->bm, index);
+          drawBmeshBone(ed->bm, bone);
+        }
+      }
+      
+      if (ed->showMeshChecked) {
+        bmeshDraw(ed->bm);
+      }
+      
       glDisable(GL_CULL_FACE);
       glDisable(GL_LIGHTING);
       
@@ -189,41 +234,52 @@ static void reshape(glwWin *win, int width, int height) {
 static void mouse(glwWin *win, int button, int state,
     int x, int y){
   editor *ed = glwGetUserData(win);
-  if (!glwPointTest(x, y, ed->glLeft, ed->glTop,
-      ed->glWidth, ed->glHeight, 0)) {
+  if (!mouseInRenderRect(win)) {
     return;
   }
   if (GLW_DOWN == state) {
-    ed->mouseX = x;
-    ed->mouseY = y;
+    ed->moveMouseX = x;
+    ed->moveMouseY = y;
   }
 }
 
 static void motion(glwWin *win, int x, int y) {
   editor *ed = glwGetUserData(win);
-  if (!glwPointTest(x, y, ed->glLeft, ed->glTop,
-      ed->glWidth, ed->glHeight, 0)) {
+  if (!mouseInRenderRect(win)) {
     return;
   }
-  ed->cameraAngleY += (x - ed->mouseX);
-  ed->cameraAngleX += (y - ed->mouseY);
-  ed->mouseX = x;
-  ed->mouseY = y;
+  ed->cameraAngleY += (x - ed->moveMouseX);
+  ed->cameraAngleX += (y - ed->moveMouseY);
+  ed->moveMouseX = x;
+  ed->moveMouseY = y;
+}
+
+static void wheel(glwWin *win, float delta) {
+  editor *ed = glwGetUserData(win);
+  if (!mouseInRenderRect(win)) {
+    return;
+  }
+  ed->cameraDistance -= delta * 0.01f;
 }
 
 int main(int argc, char *argv[]) {
   editor ed;
   glwInit();
+  drawInit();
+  
   memset(&ed, 0, sizeof(ed));
   ed.cameraAngleX = 30;
   ed.cameraAngleY = -312;
   ed.cameraDistance = 14.4;
+  ed.showMeshChecked = 1;
+  
   ed.win = glwCreateWindow(0, 0, 0, 0);
   glwSetUserData(ed.win, &ed);
   glwReshapeFunc(ed.win, reshape);
   glwDisplayFunc(ed.win, display);
   glwMouseFunc(ed.win, mouse);
   glwMotionFunc(ed.win, motion);
+  glwWheelFunc(ed.win, wheel);
   glwMainLoop();
   return 0;
 }
diff --git a/src/glw.c b/src/glw.c
index 9b1ed943..24b25255 100644
--- a/src/glw.c
+++ b/src/glw.c
@@ -688,3 +688,57 @@ int glwImLineHeight(glwWin *win) {
   glwSystemFontTexture *systemFontTexture = glwGetSystemFontTexture(win);
   return systemFontTexture->originSize.height * (1 + GLW_VER_AUTO_MARGIN * 2);
 }
+
+void glwSetUserData(glwWin *win, void *userData) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->userData = userData;
+}
+
+void *glwGetUserData(glwWin *win) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  return ctx->userData;
+}
+
+void glwDisplayFunc(glwWin *win, void (*func)(glwWin *win)) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->onDisplay = func;
+}
+
+void glwReshapeFunc(glwWin *win, void (*func)(glwWin *win, int width,
+    int height)) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->onReshape = func;
+}
+
+void glwMouseFunc(glwWin *win, void (*func)(glwWin *win, int button, int state,
+    int x, int y)) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->onMouse = func;
+}
+
+void glwMotionFunc(glwWin *win,
+    void (*func)(glwWin *win, int x, int y)) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->onMotion = func;
+}
+
+void glwPassiveMotionFunc(glwWin *win,
+    void (*func)(glwWin *win, int x, int y)) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->onPassiveMotion = func;
+}
+
+void glwWheelFunc(glwWin *win, void(*func)(glwWin *win, float delta)) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  ctx->onWheel = func;
+}
+
+int glwMouseX(glwWin *win) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  return ctx->x;
+}
+
+int glwMouseY(glwWin *win) {
+  glwWinContext *ctx = glwGetWinContext(win);
+  return ctx->y;
+}
diff --git a/src/glw.h b/src/glw.h
index e4106261..6120e39b 100644
--- a/src/glw.h
+++ b/src/glw.h
@@ -44,6 +44,7 @@ void glwMouseFunc(glwWin *win, void (*func)(glwWin *win, int button, int state,
   int x, int y));
 void glwMotionFunc(glwWin *win, void (*func)(glwWin *win, int x, int y));
 void glwPassiveMotionFunc(glwWin *win, void (*func)(glwWin *win, int x, int y));
+void glwWheelFunc(glwWin *win, void(*func)(glwWin *win, float delta));
 #define glwR(rgb) ((float)(((rgb) >> 16) & 0xff) / 255)
 #define glwG(rgb) ((float)(((rgb) >> 8) & 0xff) / 255)
 #define glwB(rgb) ((float)(((rgb)) & 0xff) / 255)
@@ -62,6 +63,8 @@ int glwImNextY(glwWin *win);
 int glwImLineHeight(glwWin *win);
 int glwPointTest(int x, int y, int left, int top, int width, int height,
   int allowOffset);
+int glwMouseX(glwWin *win);
+int glwMouseY(glwWin *win);
 
 #ifdef __cplusplus
 }
diff --git a/src/glw_internal.h b/src/glw_internal.h
index 746467f9..4fe6ab8f 100644
--- a/src/glw_internal.h
+++ b/src/glw_internal.h
@@ -16,6 +16,22 @@ typedef enum glwCtrlState {
   GLW_CTRL_STATE_PRESS,
 } glwCtrlState;
 
+typedef struct glwWinContext {
+  void (*onReshape)(glwWin *win, int width, int height);
+  void (*onDisplay)(glwWin *win);
+  void (*onMouse)(glwWin *win, int button, int state, int x, int y);
+  void (*onMotion)(glwWin *win, int x, int y);
+  void (*onPassiveMotion)(glwWin *win, int x, int y);
+  void(*onWheel)(glwWin *win, float delta);
+  int viewWidth;
+  int viewHeight;
+  float scaleX;
+  float scaleY;
+  void *userData;
+  int x;
+  int y;
+} glwWinContext;
+
 typedef struct glwSystemFontTexture {
   int texId;
   glwSize size;
@@ -50,5 +66,6 @@ void glwDrawButtonBackground(float x, float y, float width, float height,
     glwCtrlState state);
 void glwMouseEvent(glwWin *win, int button, int state, int x, int y);
 glwImGui *glwGetImGUI(glwWin *win);
+glwWinContext *glwGetWinContext(glwWin *win);
 
 #endif
diff --git a/src/glw_osx.m b/src/glw_osx.m
index 2c8107bf..546e5fc1 100644
--- a/src/glw_osx.m
+++ b/src/glw_osx.m
@@ -6,17 +6,8 @@
 @interface GLView : NSOpenGLView <NSWindowDelegate> {
   CVDisplayLinkRef displayLink;
 @public
-  void (*onReshape)(glwWin *win, int width, int height);
-  void (*onDisplay)(glwWin *win);
-  void (*onMouse)(glwWin *win, int button, int state, int x, int y);
-  void (*onMotion)(glwWin *win, int x, int y);
-  void (*onPassiveMotion)(glwWin *win, int x, int y);
-  void *userData;
   int pendingReshape;
-  int viewWidth;
-  int viewHeight;
-  float scaleX;
-  float scaleY;
+  glwWinContext context;
   glwSystemFontTexture systemFontTexture;
   glwImGui imGUI;
 }
@@ -38,6 +29,11 @@ glwSystemFontTexture *glwGetSystemFontTexture(glwWin *win) {
   return &view->systemFontTexture;
 }
 
+glwWinContext *glwGetWinContext(glwWin *win) {
+  GLView *view = ((NSWindow *)win).contentView;
+  return &view->context;
+}
+
 @implementation GLView
 - (id)initWithFrame:(NSRect)frameRect {
   NSOpenGLPixelFormatAttribute attribs[] = {NSOpenGLPFAMultisample,
@@ -82,17 +78,17 @@ glwSystemFontTexture *glwGetSystemFontTexture(glwWin *win) {
     [currentContext makeCurrentContext];
     CGLLockContext([currentContext CGLContextObj]);
     if (self->pendingReshape) {
-      if (self->onReshape) {
+      if (self->context.onReshape) {
         self->pendingReshape = 0;
         if (!self->systemFontTexture.texId) {
           glwInitSystemFontTexture((glwWin *)self.window);
         }
-        self->onReshape((glwWin *)self.window, self->viewWidth,
-          self->viewHeight);
+        self->context.onReshape((glwWin *)self.window, self->context.viewWidth,
+          self->context.viewHeight);
       }
     }
-    if (self->onDisplay) {
-      self->onDisplay((glwWin *)self.window);
+    if (self->context.onDisplay) {
+      self->context.onDisplay((glwWin *)self.window);
     }
     CGLFlushDrawable([[self openGLContext] CGLContextObj]);
     CGLUnlockContext([currentContext CGLContextObj]);
@@ -116,10 +112,10 @@ glwSystemFontTexture *glwGetSystemFontTexture(glwWin *win) {
 - (void)reshape {
   NSRect bounds = [self bounds];
   NSRect backingBounds = [self convertRectToBacking:[self bounds]];
-  viewWidth = (int)backingBounds.size.width;
-  viewHeight = (int)backingBounds.size.height;
-  self->scaleX = (float)viewWidth / bounds.size.width;
-  self->scaleY = (float)viewHeight / bounds.size.height;
+  self->context.viewWidth = (int)backingBounds.size.width;
+  self->context.viewHeight = (int)backingBounds.size.height;
+  self->context.scaleX = (float)self->context.viewWidth / bounds.size.width;
+  self->context.scaleY = (float)self->context.viewHeight / bounds.size.height;
   self->pendingReshape = 1;
   [self drawFrame];
 }
@@ -140,49 +136,66 @@ glwSystemFontTexture *glwGetSystemFontTexture(glwWin *win) {
   CGLUnlockContext([currentContext CGLContextObj]);
 }
 
-- (void)mouseMoved:(NSEvent*)event {
+- (void)saveMousePosFromEvent:(NSEvent*)event {
   NSPoint loc = [self convertPoint:[event locationInWindow] fromView:nil];
-  int x = loc.x * self->scaleX;
-  int y = loc.y * self->scaleY;
+  self->context.x = loc.x * self->context.scaleX;
+  self->context.y = loc.y * self->context.scaleY;
+}
+
+- (void)mouseMoved:(NSEvent*)event {
+  [self saveMousePosFromEvent:event];
   if (GLW_DOWN == self->imGUI.mouseState) {
-    if (self->onMotion) {
-      self->onMotion((glwWin *)self.window, x, y);
+    if (self->context.onMotion) {
+      self->context.onMotion((glwWin *)self.window,
+        self->context.x, self->context.y);
     }
   } else {
-    if (self->onPassiveMotion) {
-      self->onPassiveMotion((glwWin *)self.window, x, y);
+    if (self->context.onPassiveMotion) {
+      self->context.onPassiveMotion((glwWin *)self.window,
+        self->context.x, self->context.y);
     }
   }
 }
 
 - (void)mouseDown:(NSEvent*)event {
-  NSPoint loc = [self convertPoint:[event locationInWindow] fromView:nil];
-  int x = loc.x * self->scaleX;
-  int y = loc.y * self->scaleY;
-  glwMouseEvent((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_DOWN, x, y);
-  if (self->onMouse) {
-    self->onMouse((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_DOWN, x, y);
+  [self saveMousePosFromEvent:event];
+  glwMouseEvent((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_DOWN,
+    self->context.x, self->context.y);
+  if (self->context.onMouse) {
+    self->context.onMouse((glwWin *)self.window,
+      GLW_LEFT_BUTTON, GLW_DOWN,
+      self->context.x, self->context.y);
+  }
+}
+
+- (void)scrollWheel:(NSEvent *)event {
+  [self saveMousePosFromEvent:event];
+  if (self->context.onWheel) {
+    self->context.onWheel((glwWin *)self.window, [event deltaY] * 10);
   }
 }
 
 - (void)mouseDragged:(NSEvent *)event {
-  NSPoint loc = [self convertPoint:[event locationInWindow] fromView:nil];
-  int x = loc.x * self->scaleX;
-  int y = loc.y * self->scaleY;
+  [self saveMousePosFromEvent:event];
   if (GLW_DOWN == self->imGUI.mouseState) {
     if (GLW_DOWN == self->imGUI.mouseState) {
-      if (self->onMotion) {
-        self->onMotion((glwWin *)self.window, x, y);
+      if (self->context.onMotion) {
+        self->context.onMotion((glwWin *)self.window,
+          self->context.x, self->context.y);
       }
     } else {
-      if (self->onPassiveMotion) {
-        self->onPassiveMotion((glwWin *)self.window, x, y);
+      if (self->context.onPassiveMotion) {
+        self->context.onPassiveMotion((glwWin *)self.window,
+          self->context.x, self->context.y);
       }
     }
   } else {
-    glwMouseEvent((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_DOWN, x, y);
-    if (self->onMouse) {
-      self->onMouse((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_DOWN, x, y);
+    glwMouseEvent((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_DOWN,
+      self->context.x, self->context.y);
+    if (self->context.onMouse) {
+      self->context.onMouse((glwWin *)self.window,
+        GLW_LEFT_BUTTON, GLW_DOWN,
+        self->context.x, self->context.y);
     }
   }
 }
@@ -192,12 +205,12 @@ glwSystemFontTexture *glwGetSystemFontTexture(glwWin *win) {
 }
 
 - (void)mouseUp:(NSEvent*)event {
-  NSPoint loc = [self convertPoint:[event locationInWindow] fromView:nil];
-  int x = loc.x * self->scaleX;
-  int y = loc.y * self->scaleY;
-  glwMouseEvent((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_UP, x, y);
-  if (self->onMouse) {
-    self->onMouse((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_UP, x, y);
+  [self saveMousePosFromEvent:event];
+  glwMouseEvent((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_UP,
+    self->context.x, self->context.y);
+  if (self->context.onMouse) {
+    self->context.onMouse((glwWin *)self.window, GLW_LEFT_BUTTON, GLW_UP,
+      self->context.x, self->context.y);
   }
 }
 @end
@@ -235,16 +248,6 @@ void glwMainLoop(void) {
   }
 }
 
-void glwSetUserData(glwWin *win, void *userData) {
-  GLView *view = ((NSWindow *)win).contentView;
-  view->userData = userData;
-}
-
-void *glwGetUserData(glwWin *win) {
-  GLView *view = ((NSWindow *)win).contentView;
-  return view->userData;
-}
-
 glwWin *glwCreateWindow(int x, int y, int width, int height) {
   NSUInteger windowStyle = NSTitledWindowMask | NSClosableWindowMask | 
     NSResizableWindowMask | NSMiniaturizableWindowMask;
@@ -264,19 +267,15 @@ glwWin *glwCreateWindow(int x, int y, int width, int height) {
     defer:NO];
   
   GLView *view = [[GLView alloc] initWithFrame:viewRect];
-  view->onReshape = 0;
-  view->onDisplay = 0;
-  view->onMouse = 0;
-  view->userData = 0;
-  view->pendingReshape = 0;
-  view->viewWidth = width;
-  view->viewHeight = height;
-  view->systemFontTexture.texId = 0;
+  memset(&view->context, 0, sizeof(view->context));
+  memset(&view->systemFontTexture, 0, sizeof(view->systemFontTexture));
   memset(&view->imGUI, 0, sizeof(view->imGUI));
-  view->scaleX = 1;
-  view->scaleY = 1;
-  view->onPassiveMotion = 0;
-  view->onMotion = 0;
+  view->pendingReshape = 0;
+  view->context.viewWidth = width;
+  view->context.viewHeight = height;
+  view->systemFontTexture.texId = 0;
+  view->context.scaleX = 1;
+  view->context.scaleY = 1;
   
   [window setAcceptsMouseMovedEvents:YES];
   [window setContentView:view];
@@ -287,35 +286,6 @@ glwWin *glwCreateWindow(int x, int y, int width, int height) {
   return (glwWin *)window;
 }
 
-void glwDisplayFunc(glwWin *win, void (*func)(glwWin *win)) {
-  GLView *view = ((NSWindow *)win).contentView;
-  view->onDisplay = func;
-}
-
-void glwReshapeFunc(glwWin *win, void (*func)(glwWin *win, int width,
-    int height)) {
-  GLView *view = ((NSWindow *)win).contentView;
-  view->onReshape = func;
-}
-
-void glwMouseFunc(glwWin *win, void (*func)(glwWin *win, int button, int state,
-    int x, int y)) {
-  GLView *view = ((NSWindow *)win).contentView;
-  view->onMouse = func;
-}
-
-void glwMotionFunc(glwWin *win,
-    void (*func)(glwWin *win, int x, int y)) {
-  GLView *view = ((NSWindow *)win).contentView;
-  view->onMotion = func;
-}
-
-void glwPassiveMotionFunc(glwWin *win,
-    void (*func)(glwWin *win, int x, int y)) {
-  GLView *view = ((NSWindow *)win).contentView;
-  view->onPassiveMotion = func;
-}
-
 unsigned char *glwRenderTextToRGBA(char *text, glwFont *font, glwSize size,
     int *pixelsWide, int *pixelsHigh) {
   NSString *aString = [NSString stringWithCString:text encoding:NSMacOSRomanStringEncoding];
diff --git a/src/glw_style.h b/src/glw_style.h
index cd71d4fc..d80cc598 100644
--- a/src/glw_style.h
+++ b/src/glw_style.h
@@ -3,7 +3,7 @@
 
 #define GLW_SYSTEM_FONT_NAME    "Helvetica"
 #define GLW_SYSTEM_FONT_WEIGHT  5
-#define GLW_SYSTEM_FONT_SIZE    20
+#define GLW_SYSTEM_FONT_SIZE    21
 
 #define GLW_SMALL_ROUNDED_CORNER_SLICES 5