Method LoadAnimation

IO/Geometry/vtkGLTFDocumentLoaderInternals.cxx:340–467

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bool vtkGLTFDocumentLoaderInternals::LoadAnimation(
  const nlohmann::json& root, vtkGLTFDocumentLoader::Animation& animation)
{
  if (root.empty() || !root.is_object())
  {
    vtkErrorWithObjectMacro(this->Self, "Invalid animation value");
    return false;
  }

  animation.Name = "";
  vtkGLTFUtils::GetStringValue(root, "name", animation.Name);
  auto rootChannelsIt = root.find("channels");
  auto rootSamplersIt = root.find("samplers");
  if ((rootChannelsIt != root.end() && !rootChannelsIt.value().is_array()) ||
    (rootSamplersIt != root.end() && !rootSamplersIt.value().is_array()))
  {
    vtkErrorWithObjectMacro(this->Self,
      "Invalid animation.channels and animation.samplers for animation " << animation.Name);
    return false;
  }

  // Load channel metadata
  for (const auto& channelRoot : rootChannelsIt.value())
  {
    vtkGLTFDocumentLoader::Animation::Channel channel;
    if (!vtkGLTFUtils::GetIntValue(channelRoot, "sampler", channel.Sampler))
    {
      vtkErrorWithObjectMacro(
        this->Self, "Invalid animation.channel.sampler value for animation " << animation.Name);
      return false;
    }
    channel.TargetNode = -1;
    const auto& target = channelRoot.value("target", nlohmann::json::object());
    vtkGLTFUtils::GetIntValue(target, "node", channel.TargetNode);

    std::string targetPathString;
    if (!vtkGLTFUtils::GetStringValue(target, "path", targetPathString))
    {
      vtkErrorWithObjectMacro(
        this->Self, "Invalid animation.channel.target.path value for animation " << animation.Name);
      return false;
    }
    if (targetPathString == "translation")
    {
      channel.TargetPath = vtkGLTFDocumentLoader::Animation::Channel::PathType::TRANSLATION;
    }
    else if (targetPathString == "rotation")
    {
      channel.TargetPath = vtkGLTFDocumentLoader::Animation::Channel::PathType::ROTATION;
    }
    else if (targetPathString == "scale")
    {
      channel.TargetPath = vtkGLTFDocumentLoader::Animation::Channel::PathType::SCALE;
    }
    else if (targetPathString == "weights")
    {
      channel.TargetPath = vtkGLTFDocumentLoader::Animation::Channel::PathType::WEIGHTS;
    }