How can I reproduce loaded mesh in manual one? How to get bone weight data and animations to the manual mesh?

[slapin]

Hi, all!

Googling on the forum and reading the docs and source for Ogre I composed myself a function which loads
the mesh and creates manual one which looks the same and displays it:

Code: Select all

/* this code is taken from various places on forum and does not belong to me */
	void meshProcessing()
	{
		std::vector<Ogre::MeshPtr> m_Meshes;

	m_Meshes.push_back(Ogre::MeshManager::getSingleton().load(
		"male/normal-male.glb", "Characters"));

	std::string m_ModelId = "MergedMesh";
	Ogre::MeshPtr m_BaseMesh =
		Ogre::MeshManager::getSingleton().createManual(
			m_ModelId, Ogre::ResourceGroupManager::
					   DEFAULT_RESOURCE_GROUP_NAME);
	//Lets add some submeshes
	std::vector<Ogre::MeshPtr>::iterator itr = m_Meshes.begin();
	std::vector<Ogre::MeshPtr>::iterator itr_e = m_Meshes.end();
	int i = 0, j;
	Ogre::String skelName;
	for (; itr != itr_e; ++itr) {
		if (skelName.length() == 0) {
			skelName = m_Meshes[i]->getSkeletonName();
			std::cout << "skeleton: " << skelName;
		}
		Ogre::Mesh::SubMeshList mlist =
			m_Meshes[i]->getSubMeshes();
		i++;
		Ogre::SubMesh *in = 0, *out = 0;
		Ogre::VertexBoneAssignment vbass;
		for (j = 0; j < mlist.size(); j++) {
			in = mlist[j];
			const Ogre::String mn = in->getMaterialName();
			out = m_BaseMesh->createSubMesh();
			out->indexData = in->indexData->clone();
			out->mLodFaceList = in->mLodFaceList;
			out->operationType = in->operationType;
			out->parent = m_BaseMesh.get();
			out->useSharedVertices = false;
			out->vertexData = in->vertexData->clone();
			out->clearBoneAssignments();
			for (size_t x = 0;
			     x < in->vertexData->vertexCount; ++x) {
				vbass.vertexIndex = i;
				vbass.weight = 1.0f;
				out->addBoneAssignment(vbass);
			}
			out->setMaterialName(mn);
		}
	}

	//define a extreme boundary values
	Ogre::Real max_x = -1e+8;
	Ogre::Real min_x = 1e+8;
	Ogre::Real max_y = -1e+8;
	Ogre::Real min_y = 1e+8;
	Ogre::Real max_z = -1e+8;
	Ogre::Real min_z = +1e+8;
	// Setting bounding box
	Ogre::Mesh::SubMeshList mlist = m_BaseMesh->getSubMeshes();
	for (j = 0; j < mlist.size(); j++) {
		Ogre::SubMesh *in = mlist[j];
		Ogre::VertexData *vertex_data = in->vertexData;
		const Ogre::VertexElement *posElem =
			vertex_data->vertexDeclaration
				->findElementBySemantic(
					Ogre::VES_POSITION);
		Ogre::HardwareVertexBufferSharedPtr hwvb =
			in->vertexData->vertexBufferBinding->getBuffer(
				posElem->getSource());
		unsigned char *hbuff =
			static_cast<unsigned char *>(hwvb->lock(
				Ogre::HardwareBuffer::HBL_READ_ONLY));
		Ogre::Real *pValue;
		Ogre::Real value;

		for (size_t idx = 0; idx < vertex_data->vertexCount;
		     ++idx, hbuff += hwvb->getVertexSize()) {
			posElem->baseVertexPointerToElement(hbuff,
							    &pValue);
			value = (*pValue++);
			if (value > max_x)
				max_x = value;
			if (value < min_x)
				min_x = value;
			value = (*pValue++);

			if (value > max_y)
				max_y = value;
			if (value < min_y)
				min_y = value;
			value = (*pValue++);

			if (value > max_z)
				max_z = value;
			if (value < min_z)
				min_z = value;
		}
		hwvb->unlock();
	}
#ifdef ANIM
		m_BaseMesh->setSkeletonName(skelName);
#endif
		m_BaseMesh->_setBounds(Ogre::AxisAlignedBox(
			min_x, min_y, min_z, max_x, max_y, max_z));
		Ogre::Entity *ent =
			mScnMgr->createEntity("entName", m_BaseMesh->getName());
		Ogre::SceneNode *thisSceneNode =
			mScnMgr->getRootSceneNode()->createChildSceneNode();
		thisSceneNode->attachObject(ent);
#ifdef ANIM
		mIdle = ent->getAnimationState("idle");
		mIdle->setEnabled(true);
		mIdle->setLoop(true);
		mIdle->setWeight(1.0f);
#endif
	}

if I compile it with ANIM defined, the skeletal mesh becomes invisible because it seems weight data are missing.
otherwise everything works.
So the question is how can I add missing data to the manual mesh?

[slapin]

made it work.
The working version looks like:

Code: Select all

	void meshProcessing()
	{
		std::vector<Ogre::MeshPtr> m_Meshes;

	// Creating the character from parts
	m_Meshes.push_back(Ogre::MeshManager::getSingleton().load(
		"male/normal-male.glb", "Characters"));
	m_Meshes.push_back(Ogre::MeshManager::getSingleton().load(
		"male/clothes/suit.glb", "Characters"));

	std::string m_ModelId = "MergedMesh";
	Ogre::MeshPtr m_BaseMesh =
		Ogre::MeshManager::getSingleton().createManual(
			m_ModelId, Ogre::ResourceGroupManager::
					   DEFAULT_RESOURCE_GROUP_NAME);
	std::vector<Ogre::MeshPtr>::iterator itr = m_Meshes.begin();
	std::vector<Ogre::MeshPtr>::iterator itr_e = m_Meshes.end();
	int i = 0, j;
	Ogre::String skelName;
	for (; itr != itr_e; ++itr) {
		if (skelName.length() == 0) {
			skelName = m_Meshes[i]->getSkeletonName();
			std::cout << "skeleton: " << skelName
				  << std::endl;
		}
		Ogre::Mesh::SubMeshList mlist =
			m_Meshes[i]->getSubMeshes();
		i++;
		Ogre::SubMesh *in = 0, *out = 0;
		Ogre::VertexBoneAssignment vbass;
		for (j = 0; j < mlist.size(); j++) {
			in = mlist[j];
			const Ogre::String mn = in->getMaterialName();
			out = m_BaseMesh->createSubMesh();
			out->indexData = in->indexData->clone();
			out->mLodFaceList = in->mLodFaceList;
			out->operationType = in->operationType;
			out->parent = m_BaseMesh.get();
			out->useSharedVertices = false;
			out->vertexData = in->vertexData->clone();
			out->clearBoneAssignments();
			Ogre::Mesh::VertexBoneAssignmentList blist =
				in->getBoneAssignments();
			auto vbass_it = blist.begin();
			while (vbass_it != blist.end()) {
				out->addBoneAssignment(
					vbass_it->second);
				vbass_it++;
			}
			out->setMaterialName(mn);
		}
	}

	//define a extreme boundary values
	Ogre::Real max_x = -1e+8;
	Ogre::Real min_x = 1e+8;
	Ogre::Real max_y = -1e+8;
	Ogre::Real min_y = 1e+8;
	Ogre::Real max_z = -1e+8;
	Ogre::Real min_z = +1e+8;
	// Setting bounding box
	Ogre::Mesh::SubMeshList mlist = m_BaseMesh->getSubMeshes();
	for (j = 0; j < mlist.size(); j++) {
		Ogre::SubMesh *in = mlist[j];
		Ogre::VertexData *vertex_data = in->vertexData;
		const Ogre::VertexElement *posElem =
			vertex_data->vertexDeclaration
				->findElementBySemantic(
					Ogre::VES_POSITION);
		Ogre::HardwareVertexBufferSharedPtr hwvb =
			in->vertexData->vertexBufferBinding->getBuffer(
				posElem->getSource());
		unsigned char *hbuff =
			static_cast<unsigned char *>(hwvb->lock(
				Ogre::HardwareBuffer::HBL_READ_ONLY));
		Ogre::Real *pValue;
		Ogre::Real value;

		for (size_t idx = 0; idx < vertex_data->vertexCount;
		     ++idx, hbuff += hwvb->getVertexSize()) {
			posElem->baseVertexPointerToElement(hbuff,
							    &pValue);
			value = (*pValue++);
			if (value > max_x)
				max_x = value;
			if (value < min_x)
				min_x = value;
			value = (*pValue++);

			if (value > max_y)
				max_y = value;
			if (value < min_y)
				min_y = value;
			value = (*pValue++);

			if (value > max_z)
				max_z = value;
			if (value < min_z)
				min_z = value;
		}
		hwvb->unlock();
	}
	m_BaseMesh->setSkeletonName(skelName);
	m_BaseMesh->_setBounds(Ogre::AxisAlignedBox(
		min_x, min_y, min_z, max_x, max_y, max_z));
	Ogre::Entity *ent =
		mScnMgr->createEntity("entName", m_BaseMesh->getName());
	Ogre::SceneNode *thisSceneNode =
		mScnMgr->getRootSceneNode()->createChildSceneNode();
	thisSceneNode->attachObject(ent);
#if 0
// test using animation
// use addTime() each frame to make it work
		mIdle = ent->getAnimationState("idle");
		mIdle->setEnabled(true);
		mIdle->setLoop(true);
		mIdle->setWeight(1.0f);
#endif
	}