Method ApplyAnimation

IO/Geometry/vtkGLTFDocumentLoader.cxx:1059–1119

vtk object building and animation operations **/ ------------------------------------------------------------------------------

/** vtk object building and animation operations **/
//------------------------------------------------------------------------------
bool vtkGLTFDocumentLoader::ApplyAnimation(float t, int animationId, bool forceStep)
{
  const Animation& animation = this->InternalModel->Animations[animationId];
  for (const Animation::Channel& channel : animation.Channels)
  {
    if (channel.TargetNode >= static_cast<int>(this->InternalModel->Nodes.size()))
    {
      vtkErrorMacro("Invalid target node");
      return false;
    }

    Node& node = this->InternalModel->Nodes[channel.TargetNode];
    const Animation::Sampler& sampler = animation.Samplers[channel.Sampler];

    std::vector<float>* target;

    size_t numberOfComponents = 0;
    switch (channel.TargetPath)
    {
      case Animation::Channel::PathType::ROTATION:
        numberOfComponents =
          vtkGLTFDocumentLoader::GetNumberOfComponentsForType(AccessorType::VEC4);
        target = &(node.Rotation);
        break;
      case Animation::Channel::PathType::TRANSLATION:
        numberOfComponents =
          vtkGLTFDocumentLoader::GetNumberOfComponentsForType(AccessorType::VEC3);
        target = &(node.Translation);
        break;
      case Animation::Channel::PathType::SCALE:
        numberOfComponents =
          vtkGLTFDocumentLoader::GetNumberOfComponentsForType(AccessorType::VEC3);
        target = &(node.Scale);
        break;
      case Animation::Channel::PathType::WEIGHTS:
        numberOfComponents = node.InitialWeights.size();
        if (numberOfComponents == 0)
        {
          int nbMeshes = static_cast<int>(this->InternalModel->Meshes.size());
          if (node.Mesh < 0 || node.Mesh > nbMeshes)
          {
            vtkErrorMacro("Invalid node.mesh value.");
            return false;
          }
          numberOfComponents = this->InternalModel->Meshes[node.Mesh].Weights.size();
        }
        target = &(node.Weights);
        break;
      default:
        vtkErrorMacro(
          "Invalid animation.channel.target.path value for animation " << animation.Name);
        return false;
    }
    target->clear();
    target->reserve(numberOfComponents);
    sampler.GetInterpolatedData(t, numberOfComponents, target, forceStep,
      channel.TargetPath == Animation::Channel::PathType::ROTATION);
    node.UpdateTransform();