0031401: Visualization - revise Toolkits dependency graph - MantisBT

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ID

Project

Category

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Date Submitted

Last Update

0031401

Open CASCADE

[OCCT] OCCT:Visualization

public

2020-03-04 10:19

2020-09-21 17:42

Reporter

kgv

Assigned To

kgv

Priority

normal

Severity

integration request

Status

new

Resolution

open

Platform

OS

OS Version

Product Version

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0031401: Visualization - revise Toolkits dependency graph

Description

Visualization module consists of the following Toolkits:
- TKService
  Key dependencies: TKBRep.
  External: FreeType, FreeImage (optional), FFmpeg (optional).
- TKV3d
  Key dependencies: TKService, TKBRep, TKHLR, TKMesh [implies TKShHealing since 0026106]
- TKOpenGl [depends on TKV3d and OpenGL]
- TKMeshVS [depends on TKV3d]
- TKD3DHost [depends on TKOpenGl and D3D9]
- TKIVtk [depends on TKV3d and VTK]

There are numerous problems in current dependency graph:
- TKOpenGl depends on a bunch of unrelated libraries,
  while it is supposed only to provide OpenGL backend
  to Graphic3d_GraphicDriver interface.
     * Proposition: Move out Graphic3d package from TKV3d to dedicated toolkit TKGraphic3d.
     * Problems: Should be trivial to do?
- TKService depends on TKBRep for implementing Font_BRepFont class
  (previously depending also on TKShHealing, which has been eliminated 0025852).
     * Proposition: Move out Font_BRepFont to another toolkit.
     * Problems: ?.
- TKV3d depends on TKMesh (implying TKShHealing and big set of fat dependencies)
     * Proposition: Move out TKMesh dependency by using plugin interface (IMeshTools_MeshAlgoFactory).
     * Problems: Make sure making porting of existing applications implicit or smooth.
- TKV3d depends on TKHLR
     * Proposition: HLR is a rarely used presentation, which is better being provided via plugin interface.
     * Problems: implement transparent plugin interface and make porting of existing application smooth.
- TKV3d depends on TKBRep
     * Proposition: move out TopoDS_Shape from TKV3d to dedicated toolkit.
     * Problems: AIS, StdPrs and StdSelect are tightly bound/mixed with TopoDS_Shape;
                 separating will require splitting existing packages, renaming classes
                 and probably introduction of new sub-classes
                (how to handle AIS_InteractiveContext - remove deprecated methods?).
- TKService depends on FreeType unconditionally;
  in rare cases, it is acceptable using OCCT 3D Viewer without text output.
     * Proposition: make FreeType dependency optional 0031087.
     * Problems: updating CMake scripts.

This is a meta issue - progress is expected to be done by small steps as child issues.

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Test case number

Relationships

related to	0026106	closed	bugmaster	Open CASCADE	BRepMesh - revision of data model
parent of	0025852	closed	bugmaster	Open CASCADE	Visualization - Font_BRepFont produces bad faces for circled symbols
parent of	0031087	assigned	bugmaster	Open CASCADE	Configuration - make FreeType dependency optional
parent of	0031429	new	kgv	Open CASCADE	Visualization - move out core AIS packages from TKV3d to TKService
parent of	0031431	closed	kgv	Open CASCADE	Visualization, PrsMgr_PresentableObject - simplify HLR computing interface
parent of	0031456	closed	bugmaster	Open CASCADE	Visualization - move out Dimensions and Relations from package AIS to PrsDims
parent of	0031458	closed	bugmaster	Open CASCADE	Visualization - refine classes across Prs3d and StdPrs packages
Not all the children of this issue are yet resolved or closed.

Notes
(0090824) pdn (reporter) 2020-03-04 20:18	It is strange that BRepMesh requires ShapeHealing. Actually it depends on ShapeAnalysis. The dependence of ShapeAnalysis_Edge is easy to avoid. Concerning ShapeAnalysis_Wire (used for reorder) may be to put this tool in more "core" packages?

Issue History
Date Modified	Username	Field	Change
2020-03-04 10:19	kgv	New Issue
2020-03-04 10:19	kgv	Assigned To	=> kgv
2020-03-04 10:23	kgv	Description Updated	View Revisions
2020-03-04 10:23	kgv	Relationship added	related to 0025852
2020-03-04 10:23	kgv	Relationship replaced	parent of 0025852
2020-03-04 10:24	kgv	Description Updated	View Revisions
2020-03-04 10:25	kgv	Description Updated	View Revisions
2020-03-04 10:28	kgv	Relationship added	parent of 0031087
2020-03-04 10:28	kgv	Description Updated	View Revisions
2020-03-04 12:18	kgv	Description Updated	View Revisions
2020-03-04 20:18	pdn	Note Added: 0090824
2020-03-04 20:54	kgv	Relationship added	related to 0026106
2020-03-04 20:55	kgv	Description Updated	View Revisions
2020-03-04 21:14	kgv	Relationship added	related to 0031070
2020-03-14 13:31	kgv	Relationship added	parent of 0031429
2020-03-14 21:03	kgv	Relationship added	parent of 0031431
2020-03-21 16:35	kgv	Relationship added	parent of 0031456
2020-03-22 13:30	kgv	Relationship added	parent of 0031458
2020-09-21 17:42	kgv	Target Version	7.5.0 => 7.6.0*

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