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+/*
+---------------------------------------------------------------------------
+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.
+*/
+
+// internal headers
+#include "GenVertexNormalsProcess.h"
+#include "ProcessHelper.h"
+#include <assimp/Exceptional.h>
+#include <assimp/qnan.h>
+
+using namespace Assimp;
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+GenVertexNormalsProcess::GenVertexNormalsProcess() :
+ configMaxAngle(AI_DEG_TO_RAD(175.f)) {
+ // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+GenVertexNormalsProcess::~GenVertexNormalsProcess() {
+ // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the processing step is present in the given flag field.
+bool GenVertexNormalsProcess::IsActive(unsigned int pFlags) const {
+ force_ = (pFlags & aiProcess_ForceGenNormals) != 0;
+ flippedWindingOrder_ = (pFlags & aiProcess_FlipWindingOrder) != 0;
+ return (pFlags & aiProcess_GenSmoothNormals) != 0;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+void GenVertexNormalsProcess::SetupProperties(const Importer *pImp) {
+ // Get the current value of the AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE property
+ configMaxAngle = pImp->GetPropertyFloat(AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE, (ai_real)175.0);
+ configMaxAngle = AI_DEG_TO_RAD(std::max(std::min(configMaxAngle, (ai_real)175.0), (ai_real)0.0));
+}
+
+// ------------------------------------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+void GenVertexNormalsProcess::Execute(aiScene *pScene) {
+ ASSIMP_LOG_DEBUG("GenVertexNormalsProcess 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 (GenMeshVertexNormals(pScene->mMeshes[a], a))
+ bHas = true;
+ }
+
+ if (bHas) {
+ ASSIMP_LOG_INFO("GenVertexNormalsProcess finished. "
+ "Vertex normals have been calculated");
+ } else {
+ ASSIMP_LOG_DEBUG("GenVertexNormalsProcess finished. "
+ "Normals are already there");
+ }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+bool GenVertexNormalsProcess::GenMeshVertexNormals(aiMesh *pMesh, unsigned int meshIndex) {
+ 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 the array to hold the output normals
+ const float qnan = std::numeric_limits<ai_real>::quiet_NaN();
+ pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
+
+ // 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 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;
+ }
+ }
+
+ // Set up a SpatialSort to quickly find all vertices close to a given position
+ // check whether we can reuse the SpatialSort of a previous step.
+ SpatialSort *vertexFinder = nullptr;
+ SpatialSort _vertexFinder;
+ ai_real posEpsilon = ai_real(1e-5);
+ if (shared) {
+ std::vector<std::pair<SpatialSort, ai_real>> *avf;
+ shared->GetProperty(AI_SPP_SPATIAL_SORT, avf);
+ if (avf) {
+ std::pair<SpatialSort, ai_real> &blubb = avf->operator[](meshIndex);
+ vertexFinder = &blubb.first;
+ posEpsilon = blubb.second;
+ }
+ }
+ if (!vertexFinder) {
+ _vertexFinder.Fill(pMesh->mVertices, pMesh->mNumVertices, sizeof(aiVector3D));
+ vertexFinder = &_vertexFinder;
+ posEpsilon = ComputePositionEpsilon(pMesh);
+ }
+ std::vector<unsigned int> verticesFound;
+ aiVector3D *pcNew = new aiVector3D[pMesh->mNumVertices];
+
+ if (configMaxAngle >= AI_DEG_TO_RAD(175.f)) {
+ // There is no angle limit. Thus all vertices with positions close
+ // to each other will receive the same vertex normal. This allows us
+ // to optimize the whole algorithm a little bit ...
+ std::vector<bool> abHad(pMesh->mNumVertices, false);
+ for (unsigned int i = 0; i < pMesh->mNumVertices; ++i) {
+ if (abHad[i]) {
+ continue;
+ }
+
+ // Get all vertices that share this one ...
+ vertexFinder->FindPositions(pMesh->mVertices[i], posEpsilon, verticesFound);
+
+ aiVector3D pcNor;
+ for (unsigned int a = 0; a < verticesFound.size(); ++a) {
+ const aiVector3D &v = pMesh->mNormals[verticesFound[a]];
+ if (is_not_qnan(v.x)) pcNor += v;
+ }
+ pcNor.NormalizeSafe();
+
+ // Write the smoothed normal back to all affected normals
+ for (unsigned int a = 0; a < verticesFound.size(); ++a) {
+ unsigned int vidx = verticesFound[a];
+ pcNew[vidx] = pcNor;
+ abHad[vidx] = true;
+ }
+ }
+ }
+ // Slower code path if a smooth angle is set. There are many ways to achieve
+ // the effect, this one is the most straightforward one.
+ else {
+ const ai_real fLimit = std::cos(configMaxAngle);
+ for (unsigned int i = 0; i < pMesh->mNumVertices; ++i) {
+ // Get all vertices that share this one ...
+ vertexFinder->FindPositions(pMesh->mVertices[i], posEpsilon, verticesFound);
+
+ aiVector3D vr = pMesh->mNormals[i];
+
+ aiVector3D pcNor;
+ for (unsigned int a = 0; a < verticesFound.size(); ++a) {
+ aiVector3D v = pMesh->mNormals[verticesFound[a]];
+
+ // Check whether the angle between the two normals is not too large.
+ // Skip the angle check on our own normal to avoid false negatives
+ // (v*v is not guaranteed to be 1.0 for all unit vectors v)
+ if (is_not_qnan(v.x) && (verticesFound[a] == i || (v * vr >= fLimit)))
+ pcNor += v;
+ }
+ pcNew[i] = pcNor.NormalizeSafe();
+ }
+ }
+
+ delete[] pMesh->mNormals;
+ pMesh->mNormals = pcNew;
+
+ return true;
+}