minor update manual

fix vehicle demo (heightfield is broken, when using very large scaling factor)
add btConeShape serialization, see Issue 725
add btGearConstraint get/set, see Issue 685 and Issue 671

src/BulletCollision/CollisionShapes/btConeShape.h

@@ -90,6 +90,13 @@ public:
 	}
 
 	virtual void	setLocalScaling(const btVector3& scaling);
+	
+	
+	virtual	int	calculateSerializeBufferSize() const;
+	
+	///fills the dataBuffer and returns the struct name (and 0 on failure)
+	virtual	const char*	serialize(void* dataBuffer, btSerializer* serializer) const;
+	
 
 };
 
@@ -104,19 +111,61 @@ class btConeShapeX : public btConeShape
 		return btVector3 (1,0,0);
 	}
 
+	//debugging
+	virtual const char*	getName()const
+	{
+		return "ConeX";
+	}
+	
+	
 };
 
 ///btConeShapeZ implements a Cone shape, around the Z axis
 class btConeShapeZ : public btConeShape
 {
-	public:
-		btConeShapeZ(btScalar radius,btScalar height);
+public:
+	btConeShapeZ(btScalar radius,btScalar height);
 
 	virtual btVector3	getAnisotropicRollingFrictionDirection() const
 	{
 		return btVector3 (0,0,1);
 	}
 
+	//debugging
+	virtual const char*	getName()const
+	{
+		return "ConeZ";
+	}
+	
+	
 };
+
+///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64
+struct	btConeShapeData
+{
+	btConvexInternalShapeData	m_convexInternalShapeData;
+	
+	int	m_upIndex;
+	
+	char	m_padding[4];
+};
+
+SIMD_FORCE_INLINE	int	btConeShape::calculateSerializeBufferSize() const
+{
+	return sizeof(btConeShapeData);
+}
+
+///fills the dataBuffer and returns the struct name (and 0 on failure)
+SIMD_FORCE_INLINE	const char*	btConeShape::serialize(void* dataBuffer, btSerializer* serializer) const
+{
+	btConeShapeData* shapeData = (btConeShapeData*) dataBuffer;
+	
+	btConvexInternalShape::serialize(&shapeData->m_convexInternalShapeData,serializer);
+	
+	shapeData->m_upIndex = m_coneIndices[1];
+	
+	return "btConeShapeData";
+}
+
 #endif //BT_CONE_MINKOWSKI_H