void rotateCamera(const SbRotation &rot)
{
SoCamera * camera = viewer->getCamera();
// get center of rotation
const float radius = camera->focalDistance.getValue();
SbVec3f forward;
camera->orientation.getValue().multVec(SbVec3f(0,0,-1), forward);
const SbVec3f center = camera->position.getValue() + radius * forward;
// apply new rotation to the camera
camera->orientation = rot * camera->orientation.getValue();
// reposition camera to look at pt of interest
camera->orientation.getValue().multVec(SbVec3f(0,0,-1), forward);
camera->position = center - radius * forward;
headlightRot->rotation = camera->orientation.getValue();
// Adjust clipping planes
SoGetBoundingBoxAction clipbox_action(getViewportRegion());
clipbox_action.apply(viewer->getSceneRoot());
SbBox3f bbox = clipbox_action.getBoundingBox();
if (bbox.isEmpty())
return;
SbSphere bSphere;
bSphere.circumscribe(bbox);
float denumerator = forward.length();
float numerator = (bSphere.getCenter() - camera->position.getValue()).dot(forward);
float distToCenter = (forward * (numerator / denumerator)).length();
float farplane = distToCenter + bSphere.getRadius();
// if scene is behind the camera, don't change the planes
if (farplane < 0) return;
float nearplane = distToCenter - bSphere.getRadius();
if (nearplane < (0.001 * farplane)) nearplane = 0.001 * farplane;
camera->nearDistance = nearplane;
camera->farDistance = farplane;
}
/// Override original method since it seems to adjust the clipping planes in a weird manner.
/// Maybe using a screen-space projection or whatever.
virtual void adjustCameraClippingPlanes()
{
SoCamera * camera = getCamera();
if (!camera)
return;
SoGetBoundingBoxAction clipbox_action(getViewportRegion());
clipbox_action.apply(getSceneRoot());
SbBox3f bbox = clipbox_action.getBoundingBox();
if (bbox.isEmpty())
return;
SbSphere bSphere;
bSphere.circumscribe(bbox);
SbVec3f forward;
camera->orientation.getValue().multVec(SbVec3f(0,0,-1), forward);
float denumerator = forward.length();
float numerator = (bSphere.getCenter() - camera->position.getValue()).dot(forward);
float distToCenter = (forward * (numerator / denumerator)).length();
float farplane = distToCenter + bSphere.getRadius();
// if scene is behind the camera, don't change the planes
if (farplane < 0) return;
float nearplane = distToCenter - bSphere.getRadius();
if (nearplane < (0.001 * farplane)) nearplane = 0.001 * farplane;
camera->nearDistance = nearplane;
camera->farDistance = farplane;
}