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glut frame rate help

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Hi I am new in glut,OpenGL . The professor have given us code in c and asked to modify so far I have done everything except generating a new frame every 16 ms; currently, I have measured the animation to about 20 ms (52 frames/sec)....how can i reduce it to 16 ms any idea??...I have no clue so far.

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What platform are you developing on? Also, describe the complexity of what you are rendering, and describe how are you measuring your delta time.

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Windows vista
The code is in C
I am using Microsoft visual C++ 8

It is a simple triangle which rotates formed by vertices's only. The number of vertices can be adjusted. Therefore, not complex at all.

What do mean delta time?

I am using the following in the idle function to measure the frames/seconds


char s [50];
frame++;
time=glutGet(GLUT_ELAPSED_TIME);
if (time - timebase > 1000) {
sprintf(s,"FPS:%4.2f",
frame*1000.0/(time-timebase));
timebase = time;
frame = 0;
}
printf("Numeber of frames per second : %d \n", *s);

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