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POCan someone explain how I can use Quanternions to use the mouse to look around like a FPS?
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  1. POCan someone explain how I can use Quanternions to use the mouse to look around like a FPS?
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    copied!<p>Yesterday I asked: <a href="https://stackoverflow.com/questions/784445/how-could-simply-calling-pitch-and-yaw-cause-the-camera-to-eventually-roll">How could simply calling Pitch and Yaw cause the camera to roll?</a></p> <p>Basically, I found out because of "Gimbal Lock" that if you pitch + yaw you will inevitably produce a rolling effect. For more information you can read that question.</p> <p>I'm trying to stop this from happening. When you look around in a normal FPS shooter you don't have your camera rolling all over the place!</p> <p>Here is my current passive mouse func:</p> <pre><code>int windowWidth = 640; int windowHeight = 480; int oldMouseX = -1; int oldMouseY = -1; void mousePassiveHandler(int x, int y) { int snapThreshold = 50; if (oldMouseX != -1 &amp;&amp; oldMouseY != -1) { cam.yaw((x - oldMouseX)/10.0); cam.pitch((y - oldMouseY)/10.0); oldMouseX = x; oldMouseY = y; if ((fabs(x - (windowWidth / 2)) &gt; snapThreshold) || (fabs(y - (windowHeight / 2)) &gt; snapThreshold)) { oldMouseX = windowWidth / 2; oldMouseY = windowHeight / 2; glutWarpPointer(windowWidth / 2, windowHeight / 2); } } else { oldMouseX = windowWidth / 2; oldMouseY = windowHeight / 2; glutWarpPointer(windowWidth / 2, windowHeight / 2); } glutPostRedisplay(); } </code></pre> <p>Which causes the camera to pitch/yaw based on the mouse movement (while keeping the cursor in the center). I've also posted my original camera class <a href="http://pastebin.com/m20d2b01e" rel="nofollow noreferrer">here</a>.</p> <p>Someone in that thread suggested I use Quaternions to prevent this effect from happening but after reading the <a href="http://en.wikipedia.org/wiki/Quaternions_and_spatial_rotation" rel="nofollow noreferrer">wikipedia page</a> on them I simply don't grok them.</p> <p>How could I create a Quaternions in my OpenGL/Glut app so I can properly make my "Camera" look around without unwanted roll?</p>
 

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