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Another question: I want to know the detail about the coordinate system of the 3-markers, such as the x/y/z axis of the CS. It's very important in my project. Thanks a lot.

Thanks for your tip. I think I have solved the problem. I modified the code of the project markers. I suppose that you'd better add some more samples to the OptiTrack software.

I have 4 s250e cameras calibrated and I got a project.ttp file. I tried to run the sample project named "markers", when the program ran to TT_Update(), it returned NPRESULT_NOFRAMEAVAILABLE while(!_kbhit()) { result = TT_Update(); if(result == NPRESULT_SUCCESS) { mFrameCounter++; and this ...

I have 4 s250e cameras calibrated and I got a project.ttp file. I tried to run the sample project named "markers", when the program ran to TT_Update(), it returned NPRESULT_NOFRAMEAVAILABLE while(!_kbhit()) { result = TT_Update(); if(result == NPRESULT_SUCCESS) { mFrameCounter++; and this ...