CameraPersp CameraPersp::getFrameSphere( const Sphere &worldSpaceSphere, int maxIterations ) const
{
CameraPersp result = *this;
result.setEyePoint( worldSpaceSphere.getCenter() - result.mViewDirection * getCenterOfInterest() );
float minDistance = 0.01f, maxDistance = 100000.0f;
float curDistance = getCenterOfInterest();
for( int i = 0; i < maxIterations; ++i ) {
float curRadius = result.getScreenRadius( worldSpaceSphere, 2.0f, 2.0f );
if( curRadius < 1.0f ) { // we should get closer
maxDistance = curDistance;
curDistance = ( curDistance + minDistance ) * 0.5f;
}
else { // we should get farther
minDistance = curDistance;
curDistance = ( curDistance + maxDistance ) * 0.5f;
}
result.setEyePoint( worldSpaceSphere.getCenter() - result.mViewDirection * curDistance );
}
result.setCenterOfInterest( result.getEyePoint().distance( worldSpaceSphere.getCenter() ) );
return result;
}
void Camera::use() {
if (inUse) disable();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (mode == CAM_PERSPECTIVE) {
float x = tan(fov/2) * znear;
// l,r,b,t are specified on the near plane.
// L R bottom top near far
glFrustum(-x, x, -x/aspect, x/aspect, znear, zfar);
} else {
double x = orthoWidth / 2;
double y = x / aspect;
glOrtho(-x, x, -y, y, znear, zfar);
}
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
Vec3d at = getCenterOfInterest();
//gluLookAt(position.x, position.y, position.z, at.x, at.y, at.z, up.x, up.y, up.z);
glMultMatrix(getMatrix());
inUse = true;
}
