OpenGL相机旋转怪异

Question

我一直在与FreeGlut和Glew一起开发一个小项目。现在我编码一个摄像系统，但也有一些事情，只是奇怪：

• 在全屏模式下，如果在屏幕的下方区域移动鼠标，摄像头的动作比如果上镜头移动速度更快区域。

• 该相机使奇怪的运动，总是在同一个方向，一个小8移动移动。

代码：

void MouseOps(int x, int y) 
{ 
    // Changes in mousepositions. Always same direction and 
    // in lower right corner of monitor faster, for some reason. 
    deltaX = x - MousePreviousX; 
    deltaY = y - MousePreviousY; 

    // Also I didn't bother to put * 360 in next equations, 
    // because it would make the camera jump for crazy. 
    // resx and resy are screen resolutions. 
    // Endresult should be that camera can 
    // rotate once when mouse moves over screen 
    yaw = yaw + (((deltaX/resx)) * deginrad); 
    pitch = pitch + (((deltaY/resy)) * deginrad); 

    //Check clippings (eg. camera wont end upside down etc.) 
    if(yaw >= (2 * pi) || yaw <= (-2 * pi) ) 
     yaw = 0; 
    if(pitch >= (pi/2)) 
     pitch = pi/2; 
    if(pitch <= (pi/-2)) 
     pitch = pi/-2; 

    //Calculate x, y, and z coordinates of unit sphere to look at (r = 1) 
    cam_normX = cos(yaw) * sin(pitch); 
    cam_normY = sin(yaw) * sin(pitch); 
    cam_normZ = cos(yaw); 

    // Current x and y to previous 
    int MousePreviousX = x; 
    int MousePreviousY = y; 
} 

我试图用这个 http://en.wikipedia.org/wiki/Spherical_coordinate_system#Cartesian_coordinates 系统计算的角度去看待。然后，我通过了所有“cam_norm”变量

gluLookAt(cam_posX, cam_posY, cam_posZ, 
     cam_posX+cam_normX, cam_posY+cam_normY, cam_posZ + cam_normZ, 
     cam_upX, cam_upY, cam_upZ); 

Answer 1

我不知道为什么这个工作，但它修复的问题：

bool isCursorWarping = false; 

void MouseOps(int x, int y) 
{ 

    if(isCursorWarping == false){ 
     // Changes in mousepositions. Always same direction and in lower right corner of monitor faster, for some reason. 
     deltaX = x - MousePreviousX; 
     deltaY = y - MousePreviousY; 

     yaw = yaw + ((((deltaX/resx)) * deginrad) * 360); 
     pitch = pitch + ((((deltaY/resy)) * deginrad) * 360); 


     //Check clippings (eg. camera wont end upside down etc.) 

     if(x >= resx - 1 || y >= resy - 1 || x == 0 || y == 0) 
     { 
      warpCursor(); 
      MousePreviousX = resx/2; 
      MousePreviousY = resy/2; 
     }else{ 
      MousePreviousX = x; 
      MousePreviousY = y; 
     } 

     if(yaw >= (2 * pi) || yaw <= (-2 * pi) ) 
      yaw = 0; 
     if(pitch >= (pi/2)) 
      pitch = pi/2; 
     if(pitch <= (pi/-2)) 
      pitch = pi/-2; 


     //Calculate x, y, and z coordinates of unit sphere to look at (r = 1) 

     cam_normX = cos(pitch) * cos(yaw); 
     cam_normY = sin(pitch) * sin(yaw); 
     cam_normZ = cos(pitch) * sin(yaw); 



    } 
     // Current x and y to previous and cleanup 



     isCursorWarping = false; 


} 

void warpCursor() 
{ 
    isCursorWarping = true; 
    glutWarpPointer(resx/2, resy/2); 


} 

然后，我通过“cam_norm”值：

gluLookAt(0.0f, 1.0f, 2.0f, 0.0f + cam_normX, 1.0f + cam_normY, 2.0f+ cam_normZ, 0.0f, 0.1f, 0.0f);