// This function selects an ideal viewing distance given a selection bounding box, normal, and padding value
void LLViewerMediaFocus::setCameraZoom(F32 padding_factor)
{
LLPickInfo& pick = LLToolPie::getInstance()->getPick();
if(LLSelectMgr::getInstance()->getSelection()->isEmpty())
{
pick = mPickInfo;
setFocusFace(true, pick.getObject(), pick.mObjectFace, mMediaImpl);
}
if (!LLSelectMgr::getInstance()->getSelection()->isEmpty())
{
gAgentCamera.setFocusOnAvatar(FALSE, ANIMATE);
LLBBox selection_bbox = LLSelectMgr::getInstance()->getBBoxOfSelection();
F32 height;
F32 width;
F32 depth;
F32 angle_of_view;
F32 distance;
// We need the aspect ratio, and the 3 components of the bbox as height, width, and depth.
F32 aspect_ratio = getBBoxAspectRatio(selection_bbox, pick.mNormal, &height, &width, &depth);
F32 camera_aspect = LLViewerCamera::getInstance()->getAspect();
// We will normally use the side of the volume aligned with the short side of the screen (i.e. the height for
// a screen in a landscape aspect ratio), however there is an edge case where the aspect ratio of the object is
// more extreme than the screen. In this case we invert the logic, using the longer component of both the object
// and the screen.
bool invert = (camera_aspect > 1.0f && aspect_ratio > camera_aspect) ||
(camera_aspect < 1.0f && aspect_ratio < camera_aspect);
// To calculate the optimum viewing distance we will need the angle of the shorter side of the view rectangle.
// In portrait mode this is the width, and in landscape it is the height.
// We then calculate the distance based on the corresponding side of the object bbox (width for portrait, height for landscape)
// We will add half the depth of the bounding box, as the distance projection uses the center point of the bbox.
if(camera_aspect < 1.0f || invert)
{
angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getView() * LLViewerCamera::getInstance()->getAspect());
distance = width * 0.5 * padding_factor / tan(angle_of_view * 0.5f );
}
else
{
angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getView());
distance = height * 0.5 * padding_factor / tan(angle_of_view * 0.5f );
}
distance += depth * 0.5;
// Finally animate the camera to this new position and focal point
gAgentCamera.setCameraPosAndFocusGlobal(LLSelectMgr::getInstance()->getSelectionCenterGlobal() + LLVector3d(pick.mNormal * distance),
LLSelectMgr::getInstance()->getSelectionCenterGlobal(), LLSelectMgr::getInstance()->getSelection()->getFirstObject()->mID );
}
}
// This function selects an ideal viewing distance based on the focused object, pick normal, and padding value
void LLViewerMediaFocus::setCameraZoom(LLViewerObject* object, LLVector3 normal, F32 padding_factor, bool zoom_in_only)
{
if (object)
{
gAgentCamera.setFocusOnAvatar(FALSE, ANIMATE);
LLBBox bbox = object->getBoundingBoxAgent();
LLVector3d center = gAgent.getPosGlobalFromAgent(bbox.getCenterAgent());
F32 height;
F32 width;
F32 depth;
F32 angle_of_view;
F32 distance;
// We need the aspect ratio, and the 3 components of the bbox as height, width, and depth.
F32 aspect_ratio = getBBoxAspectRatio(bbox, normal, &height, &width, &depth);
F32 camera_aspect = LLViewerCamera::getInstance()->getAspect();
lldebugs << "normal = " << normal << ", aspect_ratio = " << aspect_ratio << ", camera_aspect = " << camera_aspect << llendl;
// We will normally use the side of the volume aligned with the short side of the screen (i.e. the height for
// a screen in a landscape aspect ratio), however there is an edge case where the aspect ratio of the object is
// more extreme than the screen. In this case we invert the logic, using the longer component of both the object
// and the screen.
bool invert = (camera_aspect > 1.0f && aspect_ratio > camera_aspect) ||
(camera_aspect < 1.0f && aspect_ratio < camera_aspect);
// To calculate the optimum viewing distance we will need the angle of the shorter side of the view rectangle.
// In portrait mode this is the width, and in landscape it is the height.
// We then calculate the distance based on the corresponding side of the object bbox (width for portrait, height for landscape)
// We will add half the depth of the bounding box, as the distance projection uses the center point of the bbox.
if(camera_aspect < 1.0f || invert)
{
angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getView() * LLViewerCamera::getInstance()->getAspect());
distance = width * 0.5 * padding_factor / tan(angle_of_view * 0.5f );
lldebugs << "using width (" << width << "), angle_of_view = " << angle_of_view << ", distance = " << distance << llendl;
}
else
{
angle_of_view = llmax(0.1f, LLViewerCamera::getInstance()->getView());
distance = height * 0.5 * padding_factor / tan(angle_of_view * 0.5f );
lldebugs << "using height (" << height << "), angle_of_view = " << angle_of_view << ", distance = " << distance << llendl;
}
distance += depth * 0.5;
// Finally animate the camera to this new position and focal point
LLVector3d camera_pos, target_pos;
// The target lookat position is the center of the selection (in global coords)
target_pos = center;
// Target look-from (camera) position is "distance" away from the target along the normal
LLVector3d pickNormal = LLVector3d(normal);
pickNormal.normalize();
camera_pos = target_pos + pickNormal * distance;
if (pickNormal == LLVector3d::z_axis || pickNormal == LLVector3d::z_axis_neg)
{
// If the normal points directly up, the camera will "flip" around.
// We try to avoid this by adjusting the target camera position a
// smidge towards current camera position
// *NOTE: this solution is not perfect. All it attempts to solve is the
// "looking down" problem where the camera flips around when it animates
// to that position. You still are not guaranteed to be looking at the
// media in the correct orientation. What this solution does is it will
// put the camera into position keeping as best it can the current
// orientation with respect to the face. In other words, if before zoom
// the media appears "upside down" from the camera, after zooming it will
// still be upside down, but at least it will not flip.
LLVector3d cur_camera_pos = LLVector3d(gAgentCamera.getCameraPositionGlobal());
LLVector3d delta = (cur_camera_pos - camera_pos);
F64 len = delta.length();
delta.normalize();
// Move 1% of the distance towards original camera location
camera_pos += 0.01 * len * delta;
}
// If we are not allowing zooming out and the old camera position is closer to
// the center then the new intended camera position, don't move camera and return
if (zoom_in_only &&
(dist_vec_squared(gAgentCamera.getCameraPositionGlobal(), target_pos) < dist_vec_squared(camera_pos, target_pos)))
{
return;
}
gAgentCamera.setCameraPosAndFocusGlobal(camera_pos, target_pos, object->getID() );
}
else
{
// If we have no object, focus back on the avatar.
gAgentCamera.setFocusOnAvatar(TRUE, ANIMATE);
}
}
