fixed vtk containerbox handler

src/Vtk/Math/vtkDense.h

@@ -0,0 +1,54 @@
+#ifndef U_VTK_DENSE_H
+#define U_VTK_DENSE_H
+
+#include "Math/Dense.h"
+#include <vtkMatrix4x4.h>
+
+namespace uLib {
+namespace Vtk {
+
+/**
+ * @brief Converts a uLib::Matrix4f to an existing vtkMatrix4x4.
+ * @param src The source Eigen matrix.
+ * @param dst The destination vtkMatrix4x4.
+ */
+inline void Matrix4fToVtk(const Matrix4f& src, vtkMatrix4x4* dst) {
+  if (!dst)
+    return;
+  for (int i = 0; i < 4; ++i)
+    for (int j = 0; j < 4; ++j)
+      dst->SetElement(i, j, src(i, j));
+}
+
+/**
+ * @brief Converts a uLib::Matrix4f to a new vtkMatrix4x4.
+ * @param src The source Eigen matrix.
+ * @return A new vtkMatrix4x4 (caller is responsible for management/deletion).
+ */
+inline vtkMatrix4x4* Matrix4fToVtk(const Matrix4f& src) {
+  vtkMatrix4x4* dst = vtkMatrix4x4::New();
+  Matrix4fToVtk(src, dst);
+  return dst;
+}
+
+/**
+ * @brief Converts a vtkMatrix4x4 to a uLib::Matrix4f.
+ * @param src The source vtkMatrix4x4.
+ * @return The converted uLib::Matrix4f matrix.
+ */
+inline Matrix4f VtkToMatrix4f(vtkMatrix4x4* src) {
+  Matrix4f dst;
+  if (!src) {
+    dst.setIdentity();
+    return dst;
+  }
+  for (int i = 0; i < 4; ++i)
+    for (int j = 0; j < 4; ++j)
+      dst(i, j) = src->GetElement(i, j);
+  return dst;
+}
+
+} // namespace Vtk
+} // namespace uLib
+
+#endif // U_VTK_DENSE_H