Original 3D Cartesian coordinate system demonstration control, using C# and OpenTK (based on OpenGL) write, has the following characteristics: 1 with a spatial orientation of the pointer. Pointer to the direction angle and pitch angle can be determined. (2) to achieve a mouse trackball (ArcBall) function. You can use the mouse to drag the rectangular coordinate system rotation flexibility, running smooth, flexible viewing. Currently the Chinese Internet on OpenTK few resources, so in this attached source code and test cases for your reference.

3D坐标系演示
............\3D坐标系演示.sln
............\3D坐标系演示.suo
............\AxlesGL
............\.......\Axles3D.cs
............\.......\Axles3D.Designer.cs
............\.......\Axles3D.resx
............\.......\AxlesGL.csproj
............\AxlesView
............\.........\AxlesView.csproj
............\.........\bin
............\.........\...\Debug
............\.........\...\.....\AxlesGL.dll
............\.........\...\.....\AxlesView.exe
............\.........\...\.....\OpenTK.dll
............\.........\...\.....\OpenTK.GLControl.dll
............\.........\...\.....\OpenTK.GLControl.xml
............\.........\...\.....\OpenTK.xml
............\.........\Form1.cs
............\.........\Form1.Designer.cs
............\.........\Form1.resx
............\.........\Program.cs
............\.........\Properties
............\.........\..........\AssemblyInfo.cs
............\.........\..........\Resources.Designer.cs
............\.........\..........\Resources.resx
............\.........\..........\Settings.Designer.cs
............\.........\..........\Settings.settings

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