cleanup and refactoring

raytracer/nvpro_core/imgui/README.md

@@ -0,0 +1,43 @@
+## Table of Contents
+- [imgui_axis.hpp](#imgui_axishpp)
+- [imgui_camera_widget.h](#imgui_camera_widgeth)
+- [imgui_orient.h](#imgui_orienth)
+
+## imgui_axis.hpp
+
+Function `Axis(ImVec2 pos, const glm::mat4& modelView, float size = 20.f)`
+which display right-handed axis in a ImGui window.
+
+Example
+
+```cpp
+{  // Display orientation axis at the bottom left corner of the window
+float  axisSize = 25.F;
+ImVec2 pos      = ImGui::GetWindowPos();
+pos.y += ImGui::GetWindowSize().y;
+pos += ImVec2(axisSize * 1.1F, -axisSize * 1.1F) * ImGui::GetWindowDpiScale();  // Offset
+ImGuiH::Axis(pos, CameraManip.getMatrix(), axisSize);
+}
+```
+
+
+## imgui_camera_widget.h
+
+### functions in ImGuiH
+
+
+- CameraWidget : CameraWidget is a Camera widget for the the Camera Manipulator
+- SetCameraJsonFile : set the name (without .json) of the setting file. It will load and replace all camera and settings
+- SetHomeCamera : set the home camera - replace the one on load
+- AddCamera : adding a camera to the list of cameras
+
+
+## imgui_orient.h
+
+### struct ImOrient
+
+> brief This is a really nice implementation of an orientation widget; all due respect to the original author ;)
+
+This is a port of the AntTweakBar orientation widget, which is a 3D orientation widget that allows the user to specify a
+3D orientation using a quaternion, axis-angle, or direction vector.  It is a very useful widget for 3D applications.
+