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    <p>Sometimes when the mouse polling rate and the screen refresh rate are not of a good ratio, updating the display based on the mouse position can result in a jerky effect.</p> <p>You have vertical sync on, correct? And if you turn it of the mouse movement is smoother at the expense of tearing?</p> <p>One option is to use a smoothing function, that "lags" the values you use for the mouse position just a tiny bit behind the real mouse position</p> <p>The gist of it goes like this:</p> <pre><code>float use_x,use_y; // position to use for displaying float springiness = 50; // tweak to taste. void smooth_mouse(float time_d,float realx,float realy) { double d = 1-exp(log(0.5)*springiness*time_d); use_x += (realx-use_x)*d; use_y += (realy-use_y)*d; } </code></pre> <p>This is an <a href="http://en.wikipedia.org/wiki/Exponential_decay" rel="nofollow">exponential decay</a> function. You call it every frame to establish what to use for a mouse position. The trick is getting the right value for <code>springiness</code>. To be pedantic, <code>springiness</code> is the number of times the distance between the real mouse position and the used position will halve. For smoothing mouse movement, a good value for <code>springiness</code> is probably 50-100.</p> <p><code>time_d</code> is the interval since the last mouse poll. Pass it the real time delta (in fractional seconds) if you can, but you can get away with just passing it <code>1.0/fps</code>.</p> <p>If you have a WebGL-capable browser you can see a live version <a href="http://knobbits.org/webgl/widgets.html" rel="nofollow">here</a> - look for a class called <code>GLDraggable</code> in <code>viewer.js</code>.</p>
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    1. POfreeglut - a smooth camera rotation using mouse
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    1. USMichael Slade
    1. USMichael Slade
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    1. COYes. Turning off vsync doesn't have an influence on the smoothness. In my code adding "lags" looks like this: int deltaX = (x - centerX) *d, int deltaY = (y - centerY) * d and then the movement is a little bit smoother
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