GLTF loader can now selectively toggle loading of certain data

Model images, keyframes and skin matrices can now be toggled.

IO/Geometry/vtkGLTFDocumentLoader.cxx

@@ -729,6 +729,11 @@ bool vtkGLTFDocumentLoader::ExtractPrimitiveAttributes(Primitive& primitive)
 //------------------------------------------------------------------------------
 bool vtkGLTFDocumentLoader::LoadAnimationData()
 {
+  if (!this->LoadAnimation)
+  {
+    // Skip loading animation key frames
+    return true;
+  }
   AccessorLoadingWorker worker;
   worker.Accessors = &(this->InternalModel->Accessors);
   worker.BufferViews = &(this->InternalModel->BufferViews);
@@ -801,6 +806,11 @@ bool vtkGLTFDocumentLoader::LoadAnimationData()
 //------------------------------------------------------------------------------
 bool vtkGLTFDocumentLoader::LoadImageData()
 {
+  if (!this->LoadImages)
+  {
+    // Skip loading model images
+    return true;
+  }
   vtkNew<vtkImageReader2Factory> factory;
   size_t numberOfMeshes = this->InternalModel->Meshes.size();
   size_t numberOfImages = this->InternalModel->Images.size();
@@ -918,6 +928,11 @@ bool vtkGLTFDocumentLoader::LoadImageData()
 //------------------------------------------------------------------------------
 bool vtkGLTFDocumentLoader::LoadSkinMatrixData()
 {
+  if (!this->LoadSkinMatrix)
+  {
+    // Skip loading the skin bind matrces
+    return true;
+  }
   AccessorLoadingWorker worker;
   worker.Accessors = &(this->InternalModel->Accessors);
   worker.BufferViews = &(this->InternalModel->BufferViews);

IO/Geometry/vtkGLTFDocumentLoader.h

@@ -615,6 +615,39 @@ public:
   vtkGetMacro(GLBStart, vtkTypeInt64);
   ///@}
 
+  ///@{
+  /**
+   * Set/Get whether to load animation keyframes from buffers
+   *
+   * Defaults to true
+   */
+  vtkSetMacro(LoadAnimation, bool);
+  vtkGetMacro(LoadAnimation, bool);
+  vtkBooleanMacro(LoadAnimation, bool);
+  ///@}
+
+  ///@{
+  /**
+   * Set/Get whether to load images from filesystem and bufferView, if available
+   *
+   * Defaults to true
+   */
+  vtkSetMacro(LoadImages, bool);
+  vtkGetMacro(LoadImages, bool);
+  vtkBooleanMacro(LoadImages, bool);
+  ///@}
+
+  ///@{
+  /**
+   * Set/Get whether to load inverse bind matrices from buffers into model's Skin structs
+   *
+   * Defaults to true
+   */
+  vtkSetMacro(LoadSkinMatrix, bool);
+  vtkGetMacro(LoadSkinMatrix, bool);
+  vtkBooleanMacro(LoadSkinMatrix, bool);
+  ///@}
+
 protected:
   vtkGLTFDocumentLoader() = default;
   ~vtkGLTFDocumentLoader() override = default;
@@ -675,6 +708,13 @@ private:
   static const std::vector<std::string> SupportedExtensions;
   std::vector<std::string> UsedExtensions;
   vtkTypeInt64 GLBStart = 0;
+
+  /**
+   * Selectively load model data
+   */
+  bool LoadAnimation = true;
+  bool LoadImages = true;
+  bool LoadSkinMatrix = true;
 };
 
 VTK_ABI_NAMESPACE_END