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trouble with directInput!

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hi, i am wondering why the x-and y-axis rotation in my engine gets faster as the frame rate gets down and slower as it gets higher. for example, with 30 fps, you turn 360 degrees about the y axis when moving the mouse only a few millimeters on the pad, while at 100 frames, you need to move it much more to even get a rotation of more than 45 degrees. im correctly multiplying the mouse values with the time differnece between two frames.
g_cAngle.y += mousedx * 40 * t;  // t = time delta in ms

g_cAngle.x += mousedy * 40 * t;  
any idea? thanks gammastrahler

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