Method WriteNode

code/AssetLib/Collada/ColladaExporter.cpp:1523–1657

------------------------------------------------------------------------------------------------ Recursively writes the given node

// ------------------------------------------------------------------------------------------------
// Recursively writes the given node
void ColladaExporter::WriteNode(const aiNode *pNode) {
    // If the node is associated with a bone, it is a joint node (JOINT)
    // otherwise it is a normal node (NODE)
    // Assimp-specific: nodes with no name cannot be associated with bones
    const char *node_type;
    bool is_joint, is_skeleton_root = false;
    if (pNode->mName.length == 0 || nullptr == mScene->findBone(pNode->mName)) {
        node_type = "NODE";
        is_joint = false;
    } else {
        node_type = "JOINT";
        is_joint = true;
        if (!pNode->mParent || nullptr == mScene->findBone(pNode->mParent->mName)) {
            is_skeleton_root = true;
        }
    }

    const std::string node_id = GetNodeUniqueId(pNode);
    const std::string node_name = GetNodeName(pNode);
    mOutput << startstr << "<node ";
    if (is_skeleton_root) {
        mFoundSkeletonRootNodeID = node_id; // For now, only support one skeleton in a scene.
    }
    mOutput << "id=\"" << node_id << "\" " << (is_joint ? "sid=\"" + node_id + "\" " : "");
    mOutput << "name=\"" << node_name
            << "\" type=\"" << node_type
            << "\">" << endstr;
    PushTag();

    // write transformation - we can directly put the matrix there
    // TODO: (thom) decompose into scale - rot - quad to allow addressing it by animations afterwards
    aiMatrix4x4 mat = pNode->mTransformation;

    // If this node is a Camera node, the camera coordinate system needs to be multiplied in.
    // When importing from Collada, the mLookAt is set to 0, 0, -1, and the node transform is unchanged.
    // When importing from a different format, mLookAt is set to 0, 0, 1. Therefore, the local camera
    // coordinate system must be changed to matche the Collada specification.
    for (size_t i = 0; i < mScene->mNumCameras; i++) {
        if (mScene->mCameras[i]->mName == pNode->mName) {
            aiMatrix4x4 sourceView;
            mScene->mCameras[i]->GetCameraMatrix(sourceView);

            aiMatrix4x4 colladaView;
            colladaView.a1 = colladaView.c3 = -1; // move into -z space.
            mat *= (sourceView * colladaView);
            break;
        }
    }

    // customized, sid should be 'matrix' to match with loader code.
    mOutput << startstr << "<matrix sid=\"matrix\">";

    mOutput << mat.a1 << " " << mat.a2 << " " << mat.a3 << " " << mat.a4 << " ";
    mOutput << mat.b1 << " " << mat.b2 << " " << mat.b3 << " " << mat.b4 << " ";
    mOutput << mat.c1 << " " << mat.c2 << " " << mat.c3 << " " << mat.c4 << " ";
    mOutput << mat.d1 << " " << mat.d2 << " " << mat.d3 << " " << mat.d4;
    mOutput << "</matrix>" << endstr;