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Diffstat (limited to 'libs/assimp/code/PostProcessing/GenFaceNormalsProcess.cpp')
| -rw-r--r-- | libs/assimp/code/PostProcessing/GenFaceNormalsProcess.cpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/libs/assimp/code/PostProcessing/GenFaceNormalsProcess.cpp b/libs/assimp/code/PostProcessing/GenFaceNormalsProcess.cpp new file mode 100644 index 0000000..517dd3b --- /dev/null +++ b/libs/assimp/code/PostProcessing/GenFaceNormalsProcess.cpp @@ -0,0 +1,147 @@ +/* +--------------------------------------------------------------------------- +Open Asset Import Library (assimp) +--------------------------------------------------------------------------- + +Copyright (c) 2006-2022, assimp team + + + +All rights reserved. + +Redistribution and use of this software in source and binary forms, +with or without modification, are permitted provided that the following +conditions are met: + +* Redistributions of source code must retain the above + copyright notice, this list of conditions and the + following disclaimer. + +* Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the + following disclaimer in the documentation and/or other + materials provided with the distribution. + +* Neither the name of the assimp team, nor the names of its + contributors may be used to endorse or promote products + derived from this software without specific prior + written permission of the assimp team. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +--------------------------------------------------------------------------- +*/ + +/** @file Implementation of the post processing step to generate face +* normals for all imported faces. +*/ + +#include "GenFaceNormalsProcess.h" +#include <assimp/Exceptional.h> +#include <assimp/postprocess.h> +#include <assimp/qnan.h> +#include <assimp/scene.h> +#include <assimp/DefaultLogger.hpp> + +using namespace Assimp; + +// ------------------------------------------------------------------------------------------------ +// Constructor to be privately used by Importer +GenFaceNormalsProcess::GenFaceNormalsProcess() { + // nothing to do here +} + +// ------------------------------------------------------------------------------------------------ +// Destructor, private as well +GenFaceNormalsProcess::~GenFaceNormalsProcess() { + // nothing to do here +} + +// ------------------------------------------------------------------------------------------------ +// Returns whether the processing step is present in the given flag field. +bool GenFaceNormalsProcess::IsActive(unsigned int pFlags) const { + force_ = (pFlags & aiProcess_ForceGenNormals) != 0; + flippedWindingOrder_ = (pFlags & aiProcess_FlipWindingOrder) != 0; + return (pFlags & aiProcess_GenNormals) != 0; +} + +// ------------------------------------------------------------------------------------------------ +// Executes the post processing step on the given imported data. +void GenFaceNormalsProcess::Execute(aiScene *pScene) { + ASSIMP_LOG_DEBUG("GenFaceNormalsProcess begin"); + + if (pScene->mFlags & AI_SCENE_FLAGS_NON_VERBOSE_FORMAT) { + throw DeadlyImportError("Post-processing order mismatch: expecting pseudo-indexed (\"verbose\") vertices here"); + } + + bool bHas = false; + for (unsigned int a = 0; a < pScene->mNumMeshes; a++) { + if (this->GenMeshFaceNormals(pScene->mMeshes[a])) { + bHas = true; + } + } + if (bHas) { + ASSIMP_LOG_INFO("GenFaceNormalsProcess finished. " + "Face normals have been calculated"); + } else { + ASSIMP_LOG_DEBUG("GenFaceNormalsProcess finished. " + "Normals are already there"); + } +} + +// ------------------------------------------------------------------------------------------------ +// Executes the post processing step on the given imported data. +bool GenFaceNormalsProcess::GenMeshFaceNormals(aiMesh *pMesh) { + if (nullptr != pMesh->mNormals) { + if (force_) { + delete[] pMesh->mNormals; + } else { + return false; + } + } + + // If the mesh consists of lines and/or points but not of + // triangles or higher-order polygons the normal vectors + // are undefined. + if (!(pMesh->mPrimitiveTypes & (aiPrimitiveType_TRIANGLE | aiPrimitiveType_POLYGON))) { + ASSIMP_LOG_INFO("Normal vectors are undefined for line and point meshes"); + return false; + } + + // allocate an array to hold the output normals + pMesh->mNormals = new aiVector3D[pMesh->mNumVertices]; + const float qnan = get_qnan(); + + // iterate through all faces and compute per-face normals but store them per-vertex. + for (unsigned int a = 0; a < pMesh->mNumFaces; a++) { + const aiFace &face = pMesh->mFaces[a]; + if (face.mNumIndices < 3) { + // either a point or a line -> no well-defined normal vector + for (unsigned int i = 0; i < face.mNumIndices; ++i) { + pMesh->mNormals[face.mIndices[i]] = aiVector3D(qnan); + } + continue; + } + + const aiVector3D *pV1 = &pMesh->mVertices[face.mIndices[0]]; + const aiVector3D *pV2 = &pMesh->mVertices[face.mIndices[1]]; + const aiVector3D *pV3 = &pMesh->mVertices[face.mIndices[face.mNumIndices - 1]]; + if (flippedWindingOrder_) + std::swap( pV2, pV3 ); + const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).NormalizeSafe(); + + for (unsigned int i = 0; i < face.mNumIndices; ++i) { + pMesh->mNormals[face.mIndices[i]] = vNor; + } + } + return true; +} |