Add a new method AIS_InteractiveContext::SetTransformPersistence, which sets transform persistence to object and selection.
Add a new method SelectMgr_SelectionManager::UpdateSelection, which re-adds selectable object in BVHs in all viewer selectors.
Add a new method SelectMgr_ViewerSelector::MoveSelectableObject, which moves object from set of not transform persistence objects to set of transform persistence objects (or vice versa).
Add a new method Graphic3d_TransformUtils::Convert, which converts gp_Trsf to Graphic3d_Mat4.
Remove the method PrsMgr_PresentableObject::SetTransformPersistence(flag, point).
1) Zoom persistence mode now fixes object in pixel coordinates and is independent on view size
2) Used gp_GTrsf instead of gp_Trsf SelectMgr_ViewerSelector to store Graphic3d_Mat4d
3) Zoom persisted objects changed behavior (become bigger) therefore test cases were updated according to new state.
4) Corrected scale for rectangular frustum
Updated test for manipulator
1) New Graphic3d_TransformPers structure for defining parameters and algorithm methods, featuring:
a) application of transformation to projection and world view matrices;
b) computation of model-world transformation of persistent object;
c) computation of transformed bounding box of persistent object.
2) Transform persistence algorithm does not make any changes to model-world transformation of object (deals with projection and world view matrices only), thus making possible to employ local transformation in a usual way.
3) Support of BVH selection for transform persistent objects (pan, rotate, zoom, trihedron persistence only).
4) Support efficient frustum culling for transform persistent objects (pan, rotate, zoom, trihedron persistence only).
5) Support of z-fitting algorithm for world-view space transform persistent objects (rotate, zoom persistence only).
6) Rewrite usage of transform persistence structures and utilities classes:
a) Replaced Graphic3d_CTransPers, TEL_TRANSFORM_PERSISTENCE by Graphic3d_TransformPers;
b) Move functions from OpenGl_Utils.hxx to Graphic3d_TransformUtils.hxx;
c) Extract matrix stack class from OpenGl_Utils.hxx to OpenGl_MatrixStack.hxx;
7) New class Graphic3d_WorldViewProjState to keep track of projection, world view matrices changes for a camera.
8) New test case bugs/vis/bug26344.
9) Renamed method Graphic3d_Camera::ModelViewState of to ::WorldViewState for consistency.
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