OpenCascade/occt
1
0
Fork 0
mirror of https://git.dev.opencascade.org/repos/occt.git synced 2025-08-14 13:30:48 +03:00
Code Activity

0027945: Visualization - handle correctly view clipping planes within zoom-persistent objects

Browse Source 
OpenGl_Structure::Render() and SelectMgr_ViewerSelector::checkOverlap()
now clip entire zoom/rotate persistence object
by checking anchor point with global clipping planes.

Image dump has been added to the new test case.
This commit is contained in:
kgv
2016-10-13 14:01:19 +03:00
committed by apn
parent a8122531ce
commit 8b1441e374
5 changed files with 148 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
src/OpenGl/OpenGl_Structure.cxx
View File

@@ -516,12 +516,43 @@ void OpenGl_Structure::Render (const Handle(OpenGl_Workspace) &theWorkspace) con
if (aCtx->Clipping().IsClippingOrCappingOn())
{
const Graphic3d_BndBox4f& aBBox = BoundingBox();
if ((!myTrsfPers.IsNull() && myTrsfPers->IsTrihedronOr2d())
|| (!myClipPlanes.IsNull() && myClipPlanes->ToOverrideGlobal()))
if (!myClipPlanes.IsNull()
&& myClipPlanes->ToOverrideGlobal())
{
aCtx->ChangeClipping().DisableGlobal (aCtx);
hasDisabled = aCtx->Clipping().HasDisabled();
}
else if (!myTrsfPers.IsNull())
{
if (myTrsfPers->IsZoomOrRotate())
{
// Zoom/rotate persistence object lives in two worlds at the same time.
// Global clipping planes can not be trivially applied without being converted
// into local space of transformation persistence object.
// As more simple alternative - just clip entire object by its anchor point defined in the world space.
const gp_Pnt anAnchor = myTrsfPers->AnchorPoint();
for (OpenGl_ClippingIterator aPlaneIt (aCtx->Clipping()); aPlaneIt.More() && aPlaneIt.IsGlobal(); aPlaneIt.Next())
{
const Handle(Graphic3d_ClipPlane)& aPlane = aPlaneIt.Value();
if (!aPlane->IsOn())
{
continue;
}
// check for clipping
const Graphic3d_Vec4d& aPlaneEquation = aPlane->GetEquation();
const Graphic3d_Vec4d aCheckPnt (anAnchor.X(), anAnchor.Y(), anAnchor.Z(), 1.0);
if (aPlaneEquation.Dot (aCheckPnt) < 0.0) // vertex is outside the half-space
{
isClipped = true;
break;
}
}
}
aCtx->ChangeClipping().DisableGlobal (aCtx);
hasDisabled = aCtx->Clipping().HasDisabled();
}
// Set of clipping planes that do not intersect the structure,
// and thus can be disabled to improve rendering performance