Add new cube mesh type ECMT_1BUF_24VTX_NP. CubeSceneNodes can now use different cube mesh types.

1 Meshbuffer with 24 vertices, so each side has it's own vertices.
Normals perpendicular to the cube-sides.
CubeSceneNode accepts now a ECUBE_MESH_TYPE
CubeSceneNode::clone now also clones rotation and scale (not sure why it didn't do that before - hope there was no reason, but can't think of any).
ISceneManager::addCubeSceneNode accepts now a ECUBE_MESH_TYPE and passes it through.
Example 22.MaterialViewer using new cube type. Also a few more beauty fixes there.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6313 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IGeometryCreator.h

@@ -24,15 +24,31 @@ namespace scene
 	{
 		//! Single buffer with 12 different vertices, normals are average of adjacent planes
 		//! Order for outgoing (front-face) normals of planes would be: NEG_Z, POS_X, POS_Z, NEG_X, POS_Y, NEG_Y
+		//! This was the only available type before Irrlicht 1.9, so it's still the default in some functions.
+		//! It has the least vertices, but is pretty much unusable if you have dynamic light
 		ECMT_1BUF_12VTX_NA,
 
 		//! One buffer per side, each with 4 vertices, normals are perpendicular to sides
-		//! Note: You probably will have to scale down your texture uv's to avoid white lines at borders 
-		//        as this mesh sets them to 0,1 values. We can't do that when creating the mesh as it 
-		//        depends on texture resolution which we don't know at that point.
-		ECMT_6BUF_4VTX_NP
+		//! You can use this one if you need different texture on each cube side
+		ECMT_6BUF_4VTX_NP,
+
+		//! Single buffer with 24 different vertices, normals are perpendicular to sides
+		ECMT_1BUF_24VTX_NP,
+
+		//! not used, counts the number of enumerated types
+		ECMT_COUNT
 	};
 
+	//! Names for ECUBE_MESH_TYPE
+	const c8* const CubeMeshTypeNames[ECMT_COUNT+1] =
+	{
+		"1BUF_12VTX_NA",
+		"ECMT_6BUF_4VTX_NP",
+		"1BUF_24VTX_NP",
+		0
+	};
+
+
 //! Helper class for creating geometry on the fly.
 /** You can get an instance of this class through ISceneManager::getGeometryCreator() */
 class IGeometryCreator : public IReferenceCounted
@@ -44,6 +60,9 @@ public:
 	\param size Dimensions of the cube.
 	\param type One of ECUBE_MESH_TYPE. So you can chose between cubes with single material or independent materials per side.
 	\return Generated mesh.
+	Note: UV's go always from 0 to 1. Which can produce wrong colors at edges with texture filtering.
+	      Fixing UV's depends on texture-size (have to be moved half a pixel towards the inside, so 0.5f/texure_size as then the pixel center is exactly on the border)
+		  Easier solution is usually to set TextureWrapU and TextureWrapV to ETC_CLAMP_TO_EDGE in the Material.
 	*/
 	virtual IMesh* createCubeMesh(const core::vector3df& size=core::vector3df(5.f,5.f,5.f), ECUBE_MESH_TYPE type = ECMT_1BUF_12VTX_NA) const =0;
 

include/ISceneManager.h

@@ -453,13 +453,15 @@ namespace scene
 		where the scene node will be placed.
 		\param rotation: Initial rotation of the scene node.
 		\param scale: Initial scale of the scene node.
+		\param type: Type of cube-mesh to create. Check ECUBE_MESH_TYPE documentation for more info
 		\return Pointer to the created test scene node. This
 		pointer should not be dropped. See IReferenceCounted::drop()
 		for more information. */
 		virtual IMeshSceneNode* addCubeSceneNode(f32 size=10.0f, ISceneNode* parent=0, s32 id=-1,
 			const core::vector3df& position = core::vector3df(0,0,0),
 			const core::vector3df& rotation = core::vector3df(0,0,0),
-			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f)) = 0;
+			const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f),
+			ECUBE_MESH_TYPE type=ECMT_1BUF_12VTX_NA) = 0;
 
 		//! Adds a sphere scene node of the given radius and detail
 		/** \param radius: Radius of the sphere.