void TPCamera::update()
{
look = glm::vec3(character->getPosition().x, height, character->getPosition().y);
glm::vec3 newEye(character->getPosition().x - character->getFacing().x*3.7, height + 1.0, character->getPosition().y - character->getFacing().y*3.7);
newEye = checkCollisionWithSquares(newEye, houseLocations, houseWidth / 2);
newEye = checkCollisionWithSquares(newEye, treeLocations, treeRadius);
eye = newEye;
}
/**********************************
now i use the first 4 cameras to update the view, because these 4 cameras locate in the same side.
void gluLookAt( GLdouble eyeX,
GLdouble eyeY,
GLdouble eyeZ,
GLdouble centerX,
GLdouble centerY,
GLdouble centerZ,
GLdouble upX,
GLdouble upY,
GLdouble upZ);
第一组eyex, eyey,eyez 相机在世界坐标的位置
第二组centerx,centery,centerz 相机镜头对准的物体在世界坐标的位置
第三组upx,upy,upz 相机向上的方向在世界坐标中的方向
你把相机想象成为你自己的脑袋：
第一组数据就是脑袋的位置
第二组数据就是眼睛看的物体的位置
第三组就是头顶朝向的方向（因为你可以歪着头看同一个物体）。
**********************************/
void ThreeDWidget::UpdateView()
{
int minCamera = _numCameras > 4 ? 4 : _numCameras;
Vector3f newEye(0, 0, 0);
Vector3f newCenter(0, 0, 0);
for(int i = 0; i < minCamera; i++)
{
newEye += _cameraCenters[i];
}
newEye(0, 0) = newEye(0, 0) / minCamera * 3;
newEye(1, 0) /= newEye(1, 0) / minCamera * 3;
newEye(2, 0) = newEye(2, 0) / minCamera * 3;
newCenter(1, 0) = newEye(1, 0) / 2;
//set view
_eye.x = newEye(0, 0);
_eye.y = newEye(1, 0);
_eye.z = newEye(2, 0);
_center.x = newCenter(0, 0);
_center.y = newCenter(1, 0);
_center.z = newCenter(2, 0);
}
