/* Open Asset Import Library (assimp) ---------------------------------------------------------------------- Copyright (c) 2006-2020, 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. ---------------------------------------------------------------------- */ #include "ScenePreprocessor.h" #include #include #include using namespace Assimp; // --------------------------------------------------------------------------------------------- void ScenePreprocessor::ProcessScene () { ai_assert(scene != NULL); // Process all meshes for (unsigned int i = 0; i < scene->mNumMeshes;++i) ProcessMesh(scene->mMeshes[i]); // - nothing to do for nodes for the moment // - nothing to do for textures for the moment // - nothing to do for lights for the moment // - nothing to do for cameras for the moment // Process all animations for (unsigned int i = 0; i < scene->mNumAnimations;++i) ProcessAnimation(scene->mAnimations[i]); // Generate a default material if none was specified if (!scene->mNumMaterials && scene->mNumMeshes) { scene->mMaterials = new aiMaterial*[2]; aiMaterial* helper; aiString name; scene->mMaterials[scene->mNumMaterials] = helper = new aiMaterial(); aiColor3D clr(0.6f,0.6f,0.6f); helper->AddProperty(&clr,1,AI_MATKEY_COLOR_DIFFUSE); // setup the default name to make this material identifiable name.Set(AI_DEFAULT_MATERIAL_NAME); helper->AddProperty(&name,AI_MATKEY_NAME); ASSIMP_LOG_DEBUG("ScenePreprocessor: Adding default material \'" AI_DEFAULT_MATERIAL_NAME "\'"); for (unsigned int i = 0; i < scene->mNumMeshes;++i) { scene->mMeshes[i]->mMaterialIndex = scene->mNumMaterials; } scene->mNumMaterials++; } } // --------------------------------------------------------------------------------------------- void ScenePreprocessor::ProcessMesh (aiMesh* mesh) { // If aiMesh::mNumUVComponents is *not* set assign the default value of 2 for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) { if (!mesh->mTextureCoords[i]) { mesh->mNumUVComponents[i] = 0; } else { if (!mesh->mNumUVComponents[i]) mesh->mNumUVComponents[i] = 2; aiVector3D* p = mesh->mTextureCoords[i], *end = p+mesh->mNumVertices; // Ensure unused components are zeroed. This will make 1D texture channels work // as if they were 2D channels .. just in case an application doesn't handle // this case if (2 == mesh->mNumUVComponents[i]) { for (; p != end; ++p) p->z = 0.f; } else if (1 == mesh->mNumUVComponents[i]) { for (; p != end; ++p) p->z = p->y = 0.f; } else if (3 == mesh->mNumUVComponents[i]) { // Really 3D coordinates? Check whether the third coordinate is != 0 for at least one element for (; p != end; ++p) { if (p->z != 0) break; } if (p == end) { ASSIMP_LOG_WARN("ScenePreprocessor: UVs are declared to be 3D but they're obviously not. Reverting to 2D."); mesh->mNumUVComponents[i] = 2; } } } } // If the information which primitive types are there in the // mesh is currently not available, compute it. if (!mesh->mPrimitiveTypes) { for (unsigned int a = 0; a < mesh->mNumFaces; ++a) { aiFace& face = mesh->mFaces[a]; switch (face.mNumIndices) { case 3u: mesh->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE; break; case 2u: mesh->mPrimitiveTypes |= aiPrimitiveType_LINE; break; case 1u: mesh->mPrimitiveTypes |= aiPrimitiveType_POINT; break; default: mesh->mPrimitiveTypes |= aiPrimitiveType_POLYGON; break; } } } // If tangents and normals are given but no bitangents compute them if (mesh->mTangents && mesh->mNormals && !mesh->mBitangents) { mesh->mBitangents = new aiVector3D[mesh->mNumVertices]; for (unsigned int i = 0; i < mesh->mNumVertices;++i) { mesh->mBitangents[i] = mesh->mNormals[i] ^ mesh->mTangents[i]; } } } // --------------------------------------------------------------------------------------------- void ScenePreprocessor::ProcessAnimation (aiAnimation* anim) { double first = 10e10, last = -10e10; for (unsigned int i = 0; i < anim->mNumChannels;++i) { aiNodeAnim* channel = anim->mChannels[i]; /* If the exact duration of the animation is not given * compute it now. */ if (anim->mDuration == -1.) { // Position keys for (unsigned int j = 0; j < channel->mNumPositionKeys;++j) { aiVectorKey& key = channel->mPositionKeys[j]; first = std::min (first, key.mTime); last = std::max (last, key.mTime); } // Scaling keys for (unsigned int j = 0; j < channel->mNumScalingKeys;++j ) { aiVectorKey& key = channel->mScalingKeys[j]; first = std::min (first, key.mTime); last = std::max (last, key.mTime); } // Rotation keys for (unsigned int j = 0; j < channel->mNumRotationKeys;++j ) { aiQuatKey& key = channel->mRotationKeys[ j ]; first = std::min (first, key.mTime); last = std::max (last, key.mTime); } } /* Check whether the animation channel has no rotation * or position tracks. In this case we generate a dummy * track from the information we have in the transformation * matrix of the corresponding node. */ if (!channel->mNumRotationKeys || !channel->mNumPositionKeys || !channel->mNumScalingKeys) { // Find the node that belongs to this animation aiNode* node = scene->mRootNode->FindNode(channel->mNodeName); if (node) // ValidateDS will complain later if 'node' is NULL { // Decompose the transformation matrix of the node aiVector3D scaling, position; aiQuaternion rotation; node->mTransformation.Decompose(scaling, rotation,position); // No rotation keys? Generate a dummy track if (!channel->mNumRotationKeys) { channel->mNumRotationKeys = 1; channel->mRotationKeys = new aiQuatKey[1]; aiQuatKey& q = channel->mRotationKeys[0]; q.mTime = 0.; q.mValue = rotation; ASSIMP_LOG_DEBUG("ScenePreprocessor: Dummy rotation track has been generated"); } // No scaling keys? Generate a dummy track if (!channel->mNumScalingKeys) { channel->mNumScalingKeys = 1; channel->mScalingKeys = new aiVectorKey[1]; aiVectorKey& q = channel->mScalingKeys[0]; q.mTime = 0.; q.mValue = scaling; ASSIMP_LOG_DEBUG("ScenePreprocessor: Dummy scaling track has been generated"); } // No position keys? Generate a dummy track if (!channel->mNumPositionKeys) { channel->mNumPositionKeys = 1; channel->mPositionKeys = new aiVectorKey[1]; aiVectorKey& q = channel->mPositionKeys[0]; q.mTime = 0.; q.mValue = position; ASSIMP_LOG_DEBUG("ScenePreprocessor: Dummy position track has been generated"); } } } } if (anim->mDuration == -1.) { ASSIMP_LOG_DEBUG("ScenePreprocessor: Setting animation duration"); anim->mDuration = last - std::min( first, 0. ); } }