add a textured sphere8.obj test with obj loader

fix shaders, so that shadowed and non-shadowed are matching
fix registerGraphicsUnitSphereShape API (level of detail), support textured sphere too
add support for textured cube
add start for a Tutorial.cpp

examples/ExampleBrowser/ExampleEntries.cpp

@@ -38,7 +38,7 @@
 #include "../SharedMemory/PhysicsClientExample.h"
 #include "../Constraints/TestHingeTorque.h"
 #include "../RenderingExamples/TimeSeriesExample.h"
-
+#include "../Tutorial/Tutorial.h"
 
 #ifdef ENABLE_LUA
 #include "../LuaDemo/LuaPhysicsSetup.h"
@@ -76,6 +76,10 @@ struct ExampleEntry
 static ExampleEntry gDefaultExamples[]=
 {
 	
+	ExampleEntry(0,"Tutorial"),
+	ExampleEntry(1,"Free Rigid Body","Free moving rigid body, without external or constraint forces", TutorialCreateFunc,0),
+
+	
 	
 	ExampleEntry(0,"API"),
 	ExampleEntry(1,"Basic Example","Create some rigid bodies using box collision shapes. This is a good example to familiarize with the basic initialization of Bullet. The Basic Example can also be compiled without graphical user interface, as a console application. Press W for wireframe, A to show AABBs, I to suspend/restart physics simulation. Press D to toggle auto-deactivation of the simulation. ", BasicExampleCreateFunc),

examples/ExampleBrowser/OpenGLExampleBrowser.cpp

@@ -51,7 +51,7 @@ static OpenGLGuiHelper*	s_guiHelper=0;
 static MyProfileWindow* s_profWindow =0;
 
 #define DEMO_SELECTION_COMBOBOX 13
-const char* startFileName = "bulletDemo.txt";
+const char* startFileName = "0_Bullet3Demo.txt";
 
 static GwenUserInterface* gui  = 0;
 static int sCurrentDemoIndex = -1;

examples/ExampleBrowser/premake4.lua

@@ -62,6 +62,7 @@
 		"../SharedMemory/PosixSharedMemory.cpp",
 		"../SharedMemory/Win32SharedMemory.cpp",
 		"../BasicDemo/BasicExample.*",
+		"../Tutorial/*",
 		"../Benchmarks/*",
 		"../CommonInterfaces/*",
 		"../ForkLift/ForkLiftDemo.*",