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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 SkeletonMeshBuilder.cpp
- * @brief Implementation of a little class to construct a dummy mesh for a skeleton
- */
-
-#include <assimp/SkeletonMeshBuilder.h>
-#include <assimp/scene.h>
-
-using namespace Assimp;
-
-// ------------------------------------------------------------------------------------------------
-// The constructor processes the given scene and adds a mesh there.
-SkeletonMeshBuilder::SkeletonMeshBuilder(aiScene *pScene, aiNode *root, bool bKnobsOnly) {
- // nothing to do if there's mesh data already present at the scene
- if (pScene->mNumMeshes > 0 || pScene->mRootNode == nullptr) {
- return;
- }
-
- if (!root) {
- root = pScene->mRootNode;
- }
-
- mKnobsOnly = bKnobsOnly;
-
- // build some faces around each node
- CreateGeometry(root);
-
- // create a mesh to hold all the generated faces
- pScene->mNumMeshes = 1;
- pScene->mMeshes = new aiMesh *[1];
- pScene->mMeshes[0] = CreateMesh();
- // and install it at the root node
- root->mNumMeshes = 1;
- root->mMeshes = new unsigned int[1];
- root->mMeshes[0] = 0;
-
- // create a dummy material for the mesh
- if (pScene->mNumMaterials == 0) {
- pScene->mNumMaterials = 1;
- pScene->mMaterials = new aiMaterial *[1];
- pScene->mMaterials[0] = CreateMaterial();
- }
-}
-
-// ------------------------------------------------------------------------------------------------
-// Recursively builds a simple mesh representation for the given node
-void SkeletonMeshBuilder::CreateGeometry(const aiNode *pNode) {
- // add a joint entry for the node.
- const unsigned int vertexStartIndex = static_cast<unsigned int>(mVertices.size());
-
- // now build the geometry.
- if (pNode->mNumChildren > 0 && !mKnobsOnly) {
- // If the node has children, we build little pointers to each of them
- for (unsigned int a = 0; a < pNode->mNumChildren; a++) {
- // find a suitable coordinate system
- const aiMatrix4x4 &childTransform = pNode->mChildren[a]->mTransformation;
- aiVector3D childpos(childTransform.a4, childTransform.b4, childTransform.c4);
- ai_real distanceToChild = childpos.Length();
- if (distanceToChild < 0.0001)
- continue;
- aiVector3D up = aiVector3D(childpos).Normalize();
-
- aiVector3D orth(1.0, 0.0, 0.0);
- if (std::fabs(orth * up) > 0.99)
- orth.Set(0.0, 1.0, 0.0);
-
- aiVector3D front = (up ^ orth).Normalize();
- aiVector3D side = (front ^ up).Normalize();
-
- unsigned int localVertexStart = static_cast<unsigned int>(mVertices.size());
- mVertices.push_back(-front * distanceToChild * (ai_real)0.1);
- mVertices.push_back(childpos);
- mVertices.push_back(-side * distanceToChild * (ai_real)0.1);
- mVertices.push_back(-side * distanceToChild * (ai_real)0.1);
- mVertices.push_back(childpos);
- mVertices.push_back(front * distanceToChild * (ai_real)0.1);
- mVertices.push_back(front * distanceToChild * (ai_real)0.1);
- mVertices.push_back(childpos);
- mVertices.push_back(side * distanceToChild * (ai_real)0.1);
- mVertices.push_back(side * distanceToChild * (ai_real)0.1);
- mVertices.push_back(childpos);
- mVertices.push_back(-front * distanceToChild * (ai_real)0.1);
-
- mFaces.push_back(Face(localVertexStart + 0, localVertexStart + 1, localVertexStart + 2));
- mFaces.push_back(Face(localVertexStart + 3, localVertexStart + 4, localVertexStart + 5));
- mFaces.push_back(Face(localVertexStart + 6, localVertexStart + 7, localVertexStart + 8));
- mFaces.push_back(Face(localVertexStart + 9, localVertexStart + 10, localVertexStart + 11));
- }
- } else {
- // if the node has no children, it's an end node. Put a little knob there instead
- aiVector3D ownpos(pNode->mTransformation.a4, pNode->mTransformation.b4, pNode->mTransformation.c4);
- ai_real sizeEstimate = ownpos.Length() * ai_real(0.18);
-
- mVertices.push_back(aiVector3D(-sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(0.0, sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, -sizeEstimate));
- mVertices.push_back(aiVector3D(0.0, sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, -sizeEstimate));
- mVertices.push_back(aiVector3D(sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(0.0, -sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, -sizeEstimate));
- mVertices.push_back(aiVector3D(0.0, -sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(-sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, -sizeEstimate));
-
- mVertices.push_back(aiVector3D(-sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, sizeEstimate));
- mVertices.push_back(aiVector3D(0.0, sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(0.0, sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, sizeEstimate));
- mVertices.push_back(aiVector3D(sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(sizeEstimate, 0.0, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, sizeEstimate));
- mVertices.push_back(aiVector3D(0.0, -sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(0.0, -sizeEstimate, 0.0));
- mVertices.push_back(aiVector3D(0.0, 0.0, sizeEstimate));
- mVertices.push_back(aiVector3D(-sizeEstimate, 0.0, 0.0));
-
- mFaces.push_back(Face(vertexStartIndex + 0, vertexStartIndex + 1, vertexStartIndex + 2));
- mFaces.push_back(Face(vertexStartIndex + 3, vertexStartIndex + 4, vertexStartIndex + 5));
- mFaces.push_back(Face(vertexStartIndex + 6, vertexStartIndex + 7, vertexStartIndex + 8));
- mFaces.push_back(Face(vertexStartIndex + 9, vertexStartIndex + 10, vertexStartIndex + 11));
- mFaces.push_back(Face(vertexStartIndex + 12, vertexStartIndex + 13, vertexStartIndex + 14));
- mFaces.push_back(Face(vertexStartIndex + 15, vertexStartIndex + 16, vertexStartIndex + 17));
- mFaces.push_back(Face(vertexStartIndex + 18, vertexStartIndex + 19, vertexStartIndex + 20));
- mFaces.push_back(Face(vertexStartIndex + 21, vertexStartIndex + 22, vertexStartIndex + 23));
- }
-
- unsigned int numVertices = static_cast<unsigned int>(mVertices.size() - vertexStartIndex);
- if (numVertices > 0) {
- // create a bone affecting all the newly created vertices
- aiBone *bone = new aiBone;
- mBones.push_back(bone);
- bone->mName = pNode->mName;
-
- // calculate the bone offset matrix by concatenating the inverse transformations of all parents
- bone->mOffsetMatrix = aiMatrix4x4(pNode->mTransformation).Inverse();
- for (aiNode *parent = pNode->mParent; parent != nullptr; parent = parent->mParent)
- bone->mOffsetMatrix = aiMatrix4x4(parent->mTransformation).Inverse() * bone->mOffsetMatrix;
-
- // add all the vertices to the bone's influences
- bone->mNumWeights = numVertices;
- bone->mWeights = new aiVertexWeight[numVertices];
- for (unsigned int a = 0; a < numVertices; a++)
- bone->mWeights[a] = aiVertexWeight(vertexStartIndex + a, 1.0);
-
- // HACK: (thom) transform all vertices to the bone's local space. Should be done before adding
- // them to the array, but I'm tired now and I'm annoyed.
- aiMatrix4x4 boneToMeshTransform = aiMatrix4x4(bone->mOffsetMatrix).Inverse();
- for (unsigned int a = vertexStartIndex; a < mVertices.size(); a++)
- mVertices[a] = boneToMeshTransform * mVertices[a];
- }
-
- // and finally recurse into the children list
- for (unsigned int a = 0; a < pNode->mNumChildren; a++)
- CreateGeometry(pNode->mChildren[a]);
-}
-
-// ------------------------------------------------------------------------------------------------
-// Creates the mesh from the internally accumulated stuff and returns it.
-aiMesh *SkeletonMeshBuilder::CreateMesh() {
- aiMesh *mesh = new aiMesh();
-
- // add points
- mesh->mNumVertices = static_cast<unsigned int>(mVertices.size());
- mesh->mVertices = new aiVector3D[mesh->mNumVertices];
- std::copy(mVertices.begin(), mVertices.end(), mesh->mVertices);
-
- mesh->mNormals = new aiVector3D[mesh->mNumVertices];
-
- // add faces
- mesh->mNumFaces = static_cast<unsigned int>(mFaces.size());
- mesh->mFaces = new aiFace[mesh->mNumFaces];
- for (unsigned int a = 0; a < mesh->mNumFaces; a++) {
- const Face &inface = mFaces[a];
- aiFace &outface = mesh->mFaces[a];
- outface.mNumIndices = 3;
- outface.mIndices = new unsigned int[3];
- outface.mIndices[0] = inface.mIndices[0];
- outface.mIndices[1] = inface.mIndices[1];
- outface.mIndices[2] = inface.mIndices[2];
-
- // Compute per-face normals ... we don't want the bones to be smoothed ... they're built to visualize
- // the skeleton, so it's good if there's a visual difference to the rest of the geometry
- aiVector3D nor = ((mVertices[inface.mIndices[2]] - mVertices[inface.mIndices[0]]) ^
- (mVertices[inface.mIndices[1]] - mVertices[inface.mIndices[0]]));
-
- if (nor.Length() < 1e-5) /* ensure that FindInvalidData won't remove us ...*/
- nor = aiVector3D(1.0, 0.0, 0.0);
-
- for (unsigned int n = 0; n < 3; ++n)
- mesh->mNormals[inface.mIndices[n]] = nor;
- }
-
- // add the bones
- mesh->mNumBones = static_cast<unsigned int>(mBones.size());
- mesh->mBones = new aiBone *[mesh->mNumBones];
- std::copy(mBones.begin(), mBones.end(), mesh->mBones);
-
- // default
- mesh->mMaterialIndex = 0;
-
- return mesh;
-}
-
-// ------------------------------------------------------------------------------------------------
-// Creates a dummy material and returns it.
-aiMaterial *SkeletonMeshBuilder::CreateMaterial() {
- aiMaterial *matHelper = new aiMaterial;
-
- // Name
- aiString matName(std::string("SkeletonMaterial"));
- matHelper->AddProperty(&matName, AI_MATKEY_NAME);
-
- // Prevent backface culling
- const int no_cull = 1;
- matHelper->AddProperty(&no_cull, 1, AI_MATKEY_TWOSIDED);
-
- return matHelper;
-}
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