Method Execute

code/PostProcessing/PretransformVertices.cpp:430–690

------------------------------------------------------------------------------------------------ Executes the post processing step on the given imported data.

// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
void PretransformVertices::Execute(aiScene *pScene) {
	ASSIMP_LOG_DEBUG("PretransformVerticesProcess begin");

	// Return immediately if we have no meshes
	if (!pScene->mNumMeshes)
		return;

	const unsigned int oldMeshes = pScene->mNumMeshes;
	const unsigned int oldAnimationChannels = pScene->mNumAnimations;
	const unsigned int oldNodes = CountNodes(pScene->mRootNode);

	if (mConfigTransform) {
		pScene->mRootNode->mTransformation = mConfigTransformation * pScene->mRootNode->mTransformation;
	}

	// first compute absolute transformation matrices for all nodes
	ComputeAbsoluteTransform(pScene->mRootNode);

	// Delete aiMesh::mBones for all meshes. The bones are
	// removed during this step and we need the pointer as
	// temporary storage
	for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {
		aiMesh *mesh = pScene->mMeshes[i];

		for (unsigned int a = 0; a < mesh->mNumBones; ++a)
			delete mesh->mBones[a];

		delete[] mesh->mBones;
        mesh->mBones = nullptr;
	}

	// now build a list of output meshes
	std::vector<aiMesh *> apcOutMeshes;

	// Keep scene hierarchy? It's an easy job in this case ...
	// we go on and transform all meshes, if one is referenced by nodes
	// with different absolute transformations a depth copy of the mesh
	// is required.
	if (mConfigKeepHierarchy) {

		// Hack: store the matrix we're transforming a mesh with in aiMesh::mBones
		BuildWCSMeshes(apcOutMeshes, pScene->mMeshes, pScene->mNumMeshes, pScene->mRootNode);

		// ... if new meshes have been generated, append them to the end of the scene
		appendNewMeshesToScene(pScene, apcOutMeshes);

		// now iterate through all meshes and transform them to world-space
		for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {
			ApplyTransform(pScene->mMeshes[i], *reinterpret_cast<aiMatrix4x4 *>(pScene->mMeshes[i]->mBones));

			// prevent improper destruction
            pScene->mMeshes[i]->mBones = nullptr;
			pScene->mMeshes[i]->mNumBones = 0;
		}
	} else {
		apcOutMeshes.reserve(static_cast<size_t>(pScene->mNumMaterials) << 1u);
		std::list<unsigned int> aiVFormats;