http://irrlicht.sourceforge.net/phpBB2/viewtopic.php?t=32019

Derive COctTreeSceneNode from IMeshSceneNode instead ISceneNode, and have it return the IMesh that was used to create its octtree.  Tested with a slightly modified example 07.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2173 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -463,6 +463,8 @@ Changes in version 1.6, TA
 
 Changes in version 1.6
 
+ - Octtree scene nodes are now IMeshSceneNodes rather than ISceneNodes, and so you can call getMesh() on them.
+
  - New scene parameter B3D_LOADER_IGNORE_MIPMAP_FLAG to ignore the often missing mipmap flag in b3d files. If this parameter is true, the old pre Irrlicht-1.5 behavior is restored.
 
  - Added Mipmap LOD Bias attribute to MaterialLayer.

examples/07.Collision/main.cpp

@@ -59,7 +59,7 @@ int main()
 	device->getFileSystem()->addZipFileArchive("../../media/map-20kdm2.pk3");
 
 	scene::IAnimatedMesh* q3levelmesh = smgr->getMesh("20kdm2.bsp");
-	scene::ISceneNode* q3node = 0;
+	scene::IMeshSceneNode* q3node = 0;
 
 	if (q3levelmesh)
 		q3node = smgr->addOctTreeSceneNode(q3levelmesh->getMesh(0));
@@ -88,7 +88,7 @@ int main()
 		q3node->setPosition(core::vector3df(-1350,-130,-1400));
 
 		selector = smgr->createOctTreeTriangleSelector(
-				q3levelmesh->getMesh(0), q3node, 128);
+				q3node->getMesh(), q3node, 128);
 		q3node->setTriangleSelector(selector);
 	}
 

include/IMeshSceneNode.h

@@ -24,9 +24,9 @@ public:
 	/** Use setMesh() to set the mesh to display.
 	*/
 	IMeshSceneNode(ISceneNode* parent, ISceneManager* mgr, s32 id,
-			const core::vector3df& position,
-			const core::vector3df& rotation,
-			const core::vector3df& scale)
+			const core::vector3df& position = core::vector3df(0,0,0),
+			const core::vector3df& rotation = core::vector3df(0,0,0),
+			const core::vector3df& scale = core::vector3df(1,1,1))
 		: ISceneNode(parent, mgr, id, position, rotation, scale) {}
 
 	//! Sets a new mesh to display

include/ISceneManager.h

@@ -496,7 +496,7 @@ namespace scene
 		\param alsoAddIfMeshPointerZero: Add the scene node even if a 0 pointer is passed.
 		\return Pointer to the OctTree if successful, otherwise 0.
 		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
-		virtual ISceneNode* addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent=0,
+		virtual IMeshSceneNode* addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent=0,
 			s32 id=-1, s32 minimalPolysPerNode=512, bool alsoAddIfMeshPointerZero=false) = 0;
 
 		//! Adds a scene node for rendering using a octtree to the scene graph.
@@ -512,7 +512,7 @@ namespace scene
 		\param alsoAddIfMeshPointerZero: Add the scene node even if a 0 pointer is passed.
 		\return Pointer to the octtree if successful, otherwise 0.
 		This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
-		virtual ISceneNode* addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent=0,
+		virtual IMeshSceneNode* addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent=0,
 			s32 id=-1, s32 minimalPolysPerNode=256, bool alsoAddIfMeshPointerZero=false) = 0;
 
 		//! Adds a camera scene node to the scene graph and sets it as active camera.

source/Irrlicht/COctTreeSceneNode.cpp

@@ -22,8 +22,8 @@ namespace scene
 //! constructor
 COctTreeSceneNode::COctTreeSceneNode(ISceneNode* parent, ISceneManager* mgr,
 					 s32 id, s32 minimalPolysPerNode)
-: ISceneNode(parent, mgr, id), StdOctTree(0), LightMapOctTree(0), TangentsOctTree(0),
-	MinimalPolysPerNode(minimalPolysPerNode)
+: IMeshSceneNode(parent, mgr, id), StdOctTree(0), LightMapOctTree(0), TangentsOctTree(0),
+	MinimalPolysPerNode(minimalPolysPerNode), Mesh(0)
 {
 #ifdef _DEBUG
 	setDebugName("COctTreeSceneNode");
@@ -279,6 +279,9 @@ bool COctTreeSceneNode::createTree(IMesh* mesh)
 
 	deleteTree();
 
+	Mesh = mesh;
+	Mesh->grab();
+
 	u32 beginTime = os::Timer::getRealTime();
 
 	u32 nodeCount = 0;
@@ -486,8 +489,32 @@ void COctTreeSceneNode::deleteTree()
 	TangentsMeshes.clear();
 
 	Materials.clear();
+
+	if(Mesh)
+		Mesh->drop();
 }
 
+void COctTreeSceneNode::setMesh(IMesh* mesh)
+{
+	createTree(mesh);
+}
+
+IMesh* COctTreeSceneNode::getMesh(void)
+{
+	return Mesh;
+}
+
+void COctTreeSceneNode::setReadOnlyMaterials(bool readonly)
+{
+	// Do nothing
+}
+
+bool COctTreeSceneNode::isReadOnlyMaterials() const
+{
+	return false;
+}
+
+
 } // end namespace scene
 } // end namespace irr
 

source/Irrlicht/COctTreeSceneNode.h

@@ -5,8 +5,7 @@
 #ifndef __C_OCT_TREE_SCENE_NODE_H_INCLUDED__
 #define __C_OCT_TREE_SCENE_NODE_H_INCLUDED__
 
-#include "ISceneNode.h"
-#include "IMesh.h"
+#include "IMeshSceneNode.h"
 #include "OctTree.h"
 
 namespace irr
@@ -14,7 +13,7 @@ namespace irr
 namespace scene
 {
 	//! implementation of the IBspTreeSceneNode
-	class COctTreeSceneNode : public ISceneNode
+	class COctTreeSceneNode : public IMeshSceneNode
 	{
 	public:
 
@@ -55,6 +54,18 @@ namespace scene
 		//! Returns type of the scene node
 		virtual ESCENE_NODE_TYPE getType() const { return ESNT_OCT_TREE; }
 
+		//! Sets a new mesh to display
+		virtual void setMesh(IMesh* mesh);
+
+		//! Get the currently defined mesh for display.
+		virtual IMesh* getMesh(void);
+
+		//! Sets if the scene node should not copy the materials of the mesh but use them in a read only style.
+		virtual void setReadOnlyMaterials(bool readonly);
+
+		//! Check if the scene node should not copy the materials of the mesh but use them in a read only style
+		virtual bool isReadOnlyMaterials() const;
+
 	private:
 
 		void deleteTree();
@@ -76,6 +87,8 @@ namespace scene
 		core::stringc MeshName;
 		s32 MinimalPolysPerNode;
 		s32 PassCount;
+
+		IMesh * Mesh;
 	};
 
 } // end namespace scene

source/Irrlicht/CSceneManager.cpp

@@ -589,7 +589,7 @@ IAnimatedMeshSceneNode* CSceneManager::addAnimatedMeshSceneNode(IAnimatedMesh* m
 //! Adds a scene node for rendering using a octtree to the scene graph. This a good method for rendering
 //! scenes with lots of geometry. The Octree is built on the fly from the mesh, much
 //! faster then a bsp tree.
-ISceneNode* CSceneManager::addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent,
+IMeshSceneNode* CSceneManager::addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent,
 			s32 id, s32 minimalPolysPerNode, bool alsoAddIfMeshPointerZero)
 {
 	if (!alsoAddIfMeshPointerZero && (!mesh || !mesh->getFrameCount()))
@@ -601,10 +601,10 @@ ISceneNode* CSceneManager::addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode*
 }
 
 
-//! Adss a scene node for rendering using a octtree. This a good method for rendering
+//! Adds a scene node for rendering using a octtree. This a good method for rendering
 //! scenes with lots of geometry. The Octree is built on the fly from the mesh, much
 //! faster then a bsp tree.
-ISceneNode* CSceneManager::addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent,
+IMeshSceneNode* CSceneManager::addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent,
 		s32 id, s32 minimalPolysPerNode, bool alsoAddIfMeshPointerZero)
 {
 	if (!alsoAddIfMeshPointerZero && !mesh)

source/Irrlicht/CSceneManager.h

@@ -111,13 +111,13 @@ namespace scene
 		//! Adds a scene node for rendering using a octtree to the scene graph. This a good method for rendering
 		//! scenes with lots of geometry. The Octree is built on the fly from the mesh, much
 		//! faster then a bsp tree.
-		virtual ISceneNode* addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent=0,
+		virtual IMeshSceneNode* addOctTreeSceneNode(IAnimatedMesh* mesh, ISceneNode* parent=0,
 			s32 id=-1, s32 minimalPolysPerNode=512, bool alsoAddIfMeshPointerZero=false);
 
 		//! Adss a scene node for rendering using a octtree. This a good method for rendering
 		//! scenes with lots of geometry. The Octree is built on the fly from the mesh, much
 		//! faster then a bsp tree.
-		virtual ISceneNode* addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent=0,
+		virtual IMeshSceneNode* addOctTreeSceneNode(IMesh* mesh, ISceneNode* parent=0,
 			s32 id=-1, s32 minimalPolysPerNode=128, bool alsoAddIfMeshPointerZero=false);
 
 		//! Adds a camera scene node to the tree and sets it as active camera.