diff --git a/source/MRViewer/CoordinateSpaces.h b/source/MRViewer/CoordinateSpaces.h
new file mode 100644
index 000000000000..20cda0a81d8b
--- /dev/null
+++ b/source/MRViewer/CoordinateSpaces.h
@@ -0,0 +1,75 @@
+#pragma once
+#include "MRMesh/MRMeshFwd.h"
+#include "MRMesh/MRVector3.h"
+#include "imgui/imgui.h"
+
+#define DEFAULT_CTORS( x ) x() = default
+
+namespace MR
+{
+
+struct WorldPoint
+{
+	DEFAULT_CTORS( WorldPoint );
+	WorldPoint( const Vector3f& point );
+	explicit WorldPoint( const CameraPoint& cp );
+
+	Vector3f p;
+};
+
+struct CameraPoint
+{
+	DEFAULT_CTORS( CameraPoint );
+	explicit CameraPoint( const WorldPoint& wp );
+	explicit CameraPoint( const ClipPoint& wp );
+
+	Vector3f p;
+}
+
+struct ClipPoint
+{
+	DEFAULT_CTORS( CameraPoint );
+	explicit ClipPoint( const CameraPoint& wp );
+	explicit ClipPoint( const ViewportPoint& wp, const Viewport& vp );
+
+	Vector3f p;
+};
+
+struct ViewportPoint
+{
+	DEFAULT_CTORS( ViewportPoint );
+	explicit ViewportPoint( const ClipPoint& wp, const Viewport& vp );
+	explicit ViewportPoint( const FrameBufferPoint& wp );
+
+	Vector3f p;
+};
+
+struct FrameBufferPoint
+{
+	DEFAULT_CTORS( FrameBufferPoint );
+	explicit FrameBufferPoint( const ViewportPoint& wp );
+	explicit FrameBufferPoint( const WindowPoint& wp );
+	explicit FrameBufferPoint( const ImGuiPoint& wp );
+
+	Vector2f p;
+};
+
+struct WindowPoint
+{
+	DEFAULT_CTORS( WindowPoint );
+	explicit WindowPoint( const FrameBufferPoint& wp );
+
+	Vector2f p;
+};
+
+struct ImGuiPoint
+{
+	DEFAULT_CTORS( ImGuiPoint );
+	explicit ImGuiPoint( const FrameBufferPoint& wp );
+
+	operator ImVec2();
+
+	Vector2f p;
+};
+
+}