add Tutorial.cpp files

load textured sphere8.obj by default as a test
tiny_obj_loader don't crash when mtl is not found
fix camera perspectives for some examples

examples/ExampleBrowser/CMakeLists.txt

@@ -27,6 +27,8 @@ SET(App_ExampleBrowser_SRCS
 	../BasicDemo/BasicExample.h
 	../ForkLift/ForkLiftDemo.cpp
 	../ForkLift/ForkLiftDemo.h
+	../Tutorial/Tutorial.cpp
+	../Tutorial/Tutorial.h
 	../GyroscopicDemo/GyroscopicSetup.cpp
 	../GyroscopicDemo/GyroscopicSetup.h
 	../Planar2D/Planar2D.cpp
@@ -41,6 +43,7 @@ SET(App_ExampleBrowser_SRCS
 	../FractureDemo/btFractureDynamicsWorld.h
 	../DynamicControlDemo/MotorDemo.cpp
 	../DynamicControlDemo/MotorDemo.h
+	
 		../RenderingExamples/CoordinateSystemDemo.cpp
 	../RenderingExamples/CoordinateSystemDemo.h
 	../RenderingExamples/RaytracerSetup.cpp
@@ -118,6 +121,9 @@ SET(App_ExampleBrowser_SRCS
   ../Constraints/ConstraintPhysicsSetup.h
   
 	
+	../ThirdPartyLibs/stb_image/stb_image.cpp
+	../ThirdPartyLibs/stb_image/stb_image.h
+
     ../ThirdPartyLibs/Wavefront/tiny_obj_loader.cpp
     ../ThirdPartyLibs/tinyxml/tinystr.cpp
     ../ThirdPartyLibs/tinyxml/tinyxml.cpp

examples/ExampleBrowser/ExampleEntries.cpp

@@ -76,9 +76,7 @@ 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"),
@@ -110,6 +108,10 @@ static ExampleEntry gDefaultExamples[]=
  ExampleEntry(1,"Constraint Feedback", "The example shows how to receive joint reaction forces in a btMultiBody. Also the applied impulse is available for a btMultiBodyJointMotor", MultiBodyConstraintFeedbackCreateFunc),
 	ExampleEntry(1,"Inverted Pendulum PD","Keep an inverted pendulum up using open loop PD control", InvertedPendulumPDControlCreateFunc),
 
+	ExampleEntry(0,"Tutorial"),
+	ExampleEntry(1,"Free Rigid Body","(Preliminary work in progress) Free moving rigid body, without external or constraint forces", TutorialCreateFunc,0),
+
+
 #ifdef INCLUDE_CLOTH_DEMOS
 	ExampleEntry(0,"Soft Body"),
 	ExampleEntry(1,"Cloth","Simulate a patch of cloth.", SoftDemoCreateFunc,0),

examples/Importers/ImportObjDemo/ImportObjExample.cpp

@@ -8,6 +8,7 @@
 #include "Wavefront2GLInstanceGraphicsShape.h"
 #include "../../Utils/b3ResourcePath.h"
 #include "Bullet3Common/b3FileUtils.h"
+
 #include "stb_image/stb_image.h"
 
 #include "../CommonInterfaces/CommonRigidBodyBase.h"
@@ -24,10 +25,10 @@ public:
 
 	virtual void resetCamera()
 	{
-		float dist = 50;
+		float dist = 18;
-		float pitch = 61;
+		float pitch = 120;
-		float yaw = 18;
+		float yaw = 46;
-		float targetPos[3]={-15,-15,47};
+		float targetPos[3]={-2,-2,-2};
 		m_guiHelper->resetCamera(dist,pitch,yaw,targetPos[0],targetPos[1],targetPos[2]);
 	}
 
@@ -58,7 +59,7 @@ void ImportObjSetup::initPhysics()
 	m_dynamicsWorld->getDebugDrawer()->setDebugMode(btIDebugDraw::DBG_DrawWireframe);
 
 
-   const char* fileName = "sphere8.obj";
+   const char* fileName = "sphere8.obj";//sponza_closed.obj";//sphere8.obj";
         char relativeFileName[1024];
         if (b3ResourcePath::findResourcePath(fileName, relativeFileName, 1024))
         {

examples/ThirdPartyLibs/Wavefront/tiny_obj_loader.cpp

@@ -606,8 +606,8 @@ LoadObj(
 
       std::string err_mtl = LoadMtl(material_map, namebuf, mtl_basepath);
       if (!err_mtl.empty()) {
-        faceGroup.resize(0);  // for safety
+        //faceGroup.resize(0);  // for safety
-        return err_mtl;
+        //return err_mtl;
       }
       continue;
     }

examples/Tutorial/Tutorial.cpp

@@ -5,10 +5,11 @@
 
 #include "../CommonInterfaces/CommonExampleInterface.h"
 #include "LinearMath/btTransform.h"
-#include "stb_image/stb_image.h"
 
 #include "../CommonInterfaces/CommonGUIHelperInterface.h"
 
+#include "stb_image/stb_image.h"
+
 struct LWPose
 {
 	btVector3		m_worldPosition;
@@ -227,7 +228,7 @@ public:
 
 	virtual void resetCamera()
 	{
-		float dist = 3.5;
+		float dist = 10.5;
 		float pitch = 136;
 		float yaw = 32;
 		float targetPos[3]={0,0,0};