Wed, 12/17/2008 - 22:51
Hi all,
I am getting doubts about how to manage graphic context. That is, Handle(V3d_Viewer) and Handle(Graphic3d_WNTGraphicDevice) objects.
I have a MFC MDI Application, and for each document, I have got a view with four rendering screens. By now, I am creating this two objects for each document, and sharing between the four different views.
My question is what is better in performance (speed and memory consumption):
1.- Create a viewer and a graphic device for all the application and use whenever I need (even setting dialog or whatever).
2.- Create a viewer and a grahpic device for each MFC View, so I will have one context for each 4 rendering views (Because they share geometry).
3.- Create a viewer and a graphic device for each rendering screen(I guess this is the worst).
Thank you very much for your help. If starts are bad, then it is too late...
Wed, 12/17/2008 - 23:47
Look at how MFC MDI samples shipped with Open CASCADE are made. They implement one-to-one relationship between a document and AIS_InteractiveContext. AIS_IC contains one V3d_Viewer (+1 viewer for collector). Graphic3d_WNTGraphicDevice is used only once when creating a V3d_Viewer.
That's a typical approach used for creating OCC-based MDI apps.
Hope this helps.
Roman
---
opencascade.blogspot.com - blog on Open CASCADE
Thu, 12/18/2008 - 20:44
Ok, I've checked into the MFC samples and I find there are defined by Document.
Problem is that each document has only a viewer, so I cannot get a conclusion.
The best reason to make a decission is to know what those objects are using for, because it could be a very cheapest method for me to not to spend memory.
Thanks
P.D. Interesting blog, Roman.
Thu, 12/18/2008 - 22:37
I answer to me to fix my errors.
Handle(Graphic3d_WNTGraphicDevice) is created by the App class, so one instance per program.
Handle(V3d_Viewer) is created by the Doc class. In my case, and only because I am sharing geometry between different rendering CWnd for each document, I will get the same, a unique V3d_Viewer for each Doc.
Regards
Tue, 03/17/2009 - 12:12
Hi, Roman,
Is there any way to control "AIS2D_InteractiveContext" or V2d_view to dispay different graphics in two split views?
I want to dispaly a complicated graphics from one view to two split views (top & bottom) in a childframe. I want to display a block diagram in the top view, and then when clicking some block in the top view, the detail about the block would be displayed in the bottom view. AIS2D_InteractiveContext is used for the display.
My problem is at each time, both of the views display the same graphics. The two view use the same class for I want to use the same displaye methods for them.
Thanks a lot!
Regards
Chris
Tue, 03/17/2009 - 21:17
See http://www.opencascade.org/org/forum/thread_16051/