View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0026840 | Community | OCCT:Visualization | public | 2015-11-05 05:19 | 2016-11-19 08:44 |
| Reporter | Vico Liang | Assigned To | bugmaster | ||
| Priority | low | Severity | feature | ||
| Status | closed | Resolution | no change required | ||
| Summary | 0026840: OCCT Visulazation doesn't support un-scalable solid arrow. | ||||
| Description | In most cases, the user expected arrow is drawn as solid and also the size should not scale by camera zooming. The two images attached will show the differences. | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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OCCTArrow.png (15,061 bytes) |
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ExpectedArrow.png (2,729 bytes) |
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Dear Vico, the bug description is too imprecise - "OCCT Visualization" provides all capabilities needed to draw 2D arrows with zoom-persistent tips, and many applications already do that. If you are missing some options for specific presentation class (e.g. within predefined list of interactive objects in package AIS) - please at least name it. |
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Dear kgv, What i need is arrows in 3d space not just in 2d. I have tried with zoom-persistent in 3d space but the result is incorrect. Let me describe my requirements more clearly. I want to draw an arrow start from gp_Pnt(0,0,0) to gp_Pnt(10, 10, 10). And then i create the arrow with options Prs3d_ArrowAspect to specify the arrow size. Plese see the code of below: void MyRendering_Direction::Compute(const Handle(PrsMgr_PresentationManager3d)& thePrsMgr, const Handle(Prs3d_Presentation)& thePresentation, const Standard_Integer theMode) { // Set style for arrow Handle(Prs3d_ArrowAspect) anArrowAspect = myDrawer->ArrowAspect(); // Draw Line Handle(Graphic3d_ArrayOfSegments) aPrims = new Graphic3d_ArrayOfSegments(2); aPrims->AddVertex(myStartPnt); aPrims->AddVertex(myEndPnt); Prs3d_Root::CurrentGroup(thePresentation)->SetPrimitivesAspect(myDrawer->LineAspect()->Aspect()); Prs3d_Root::CurrentGroup(thePresentation)->AddPrimitiveArray(aPrims); // Draw arrow Prs3d_Arrow::Draw(thePresentation, myEndPnt, gp_Dir(gp_Vec(myStartPnt, myEndPnt)), anArrowAspect->Angle(), anArrowAspect->Length()); } Usage as below: Handle(MyRendering_Direction) aDirection = new MyRendering_Direction(aP1, aP2); Handle(Prs3d_LineAspect) aLineAttrib = new Prs3d_LineAspect(Quantity_NOC_RED, Aspect_TOL_SOLID, 6.0); aDirection->SetTransformPersistence(Graphic3d_TMF_ZoomPers); aDirection->Attributes()->SetLineAspect(aLineAttrib); The generated arrow's two ends will even not changes during zooming. This is not my expected. I hope that the arrow's two ends still keep touch the same 3d points aP1 and aP2. |
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The "Solid" arrow might be composed of a solid cylinder and a solid cone. |
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The pixel radius of the cylinder and cone size should not be changed during zooming. |
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I don't think "OCCT Visualization" have such capability to do that. |
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aDirection->SetTransformPersistence(Graphic3d_TMF_ZoomPers);
your code does not define anchor point for transformation persistence:
//! Sets up Transform Persistence Mode for this object.
//! This function used to lock in object position, rotation and /
//! or zooming relative to camera position.
//! Object will be drawn in the origin setted by APoint parameter
...
void SetTransformPersistence (const Graphic3d_TransModeFlags& aFlag,
const gp_Pnt& APoint);
The presentation itself should be defined in local reference system related to anchor point.
Handle(MyRendering_Direction) aDirection = new MyRendering_Direction(aP1, aP2);
if I'm not wrong, you are trying to create a single presentation object which you are expecting should combine zoom-persistent (arrow tip) and normal (line segment) parts. This can be done by connecting interactive objects or graphic3d structures. |
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Dear kgv, Your understanding is exact. Would you please describe how to do that by connecting interactive objects or graphic3d structures? I can't find any hint in the entire OCCT source codes. |
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The following Draw Harness script shows the idea how such presentations can be defined:pload MODELING VISUALIZATION vclear vinit View1 box b1 -1 0 0 1 2 3 box b2 1 0 0 1 2 3 vdisplay -dispMode 1 b1 b2 vfit vdrawparray l segments v 0 0 0 v 1 0 0 vdrawparray a triangles v -30 -10 0 v -30 10 0 v 0 0 0 vdisplay a -trsfPers zoom -trsfPersPos 1 0 0 vconnect aa 0 0 0 a l verase a l |
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arrow_1.png (19,092 bytes) |
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arrow_2.png (20,735 bytes) |
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Dear kgv, It's cool. I understand it now. I appriciate your kindly help. Please close this issue. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2015-11-05 05:19 | Vico Liang | New Issue | |
| 2015-11-05 05:19 | Vico Liang | Assigned To | => kgv |
| 2015-11-05 05:19 | Vico Liang | File Added: OCCTArrow.png | |
| 2015-11-05 05:19 | Vico Liang | File Added: ExpectedArrow.png | |
| 2015-11-05 10:09 | kgv | Note Added: 0047782 | |
| 2015-11-05 10:09 | kgv | Assigned To | kgv => Vico Liang |
| 2015-11-05 10:09 | kgv | Status | new => feedback |
| 2015-11-05 10:09 | kgv | Note Edited: 0047782 | |
| 2015-11-05 10:10 | kgv | Priority | normal => low |
| 2015-11-05 10:10 | kgv | Severity | minor => feature |
| 2015-11-05 10:10 | kgv | Target Version | 7.0.0 => 7.1.0 |
| 2015-11-05 10:33 | Vico Liang | Note Added: 0047783 | |
| 2015-11-05 10:35 | Vico Liang | Assigned To | Vico Liang => kgv |
| 2015-11-05 10:38 | Vico Liang | Note Added: 0047784 | |
| 2015-11-05 10:42 | Vico Liang | Note Added: 0047785 | |
| 2015-11-05 10:44 | Vico Liang | Note Added: 0047786 | |
| 2015-11-05 11:17 | kgv | Note Added: 0047795 | |
| 2015-11-05 11:17 | kgv | Note Edited: 0047795 | |
| 2015-11-05 11:18 | kgv | Note Edited: 0047795 | |
| 2015-11-05 16:29 | Vico Liang | Note Added: 0047841 | |
| 2015-11-06 10:12 | Vico Liang | Status | feedback => assigned |
| 2016-05-23 16:05 | kgv | Note Added: 0054298 | |
| 2016-05-23 16:05 | kgv | Assigned To | kgv => Vico Liang |
| 2016-05-23 16:05 | kgv | Status | assigned => feedback |
| 2016-05-23 16:05 | kgv | Resolution | open => no change required |
| 2016-05-23 16:06 | kgv | File Added: arrow_1.png | |
| 2016-05-23 16:06 | kgv | File Added: arrow_2.png | |
| 2016-05-24 05:09 | Vico Liang | Note Added: 0054319 | |
| 2016-05-24 05:09 | Vico Liang | Assigned To | Vico Liang => kgv |
| 2016-05-24 08:29 | kgv | Assigned To | kgv => bugmaster |
| 2016-05-24 08:29 | kgv | Target Version | 7.1.0 => |
| 2016-05-24 11:16 | bugmaster | Status | feedback => closed |
| 2016-11-19 08:44 | kgv | Relationship added | related to 0027919 |
