Fri, 11/10/2000 - 15:37
Forums:
Hello!
I'm using OpenCASCADE under Windows 2000, hardware - PIII - 500MHz, 512 Mb RAM, GeForce 256 DDR 32M and i found that some algorythms are very slow! For example CUT - i use BRepAlgoAPI_Cut. When i cut complex solid with simple cylinder it takes aproximately 2 seconds!!! 10 cut operations take 18 seconds! I compared that with ProEngineer2000i2 - ProEngineer2000i2 make cuts 10 times faster. So what's the problem? Maybe i can use another function, or this problem will be resolved later?
Best regards, Dima
Fri, 11/10/2000 - 18:02
In my opinion, you never do a cut with Pro/E but something like a BRepFeat_MakePrism() with a circular profile. Anyway I do not how OpenCASCADE compares with Pro/E on that topic in term of performance, but it should be quicker than a cut anyway.
Regards
Mon, 11/13/2000 - 12:09
Hello!
Thanks for reply!
I tried to use BRepFeat_MakePrism() but i didn't find it faster. Could you, please, explain me, what the difference between using BRepFeat_MakePrism() and using BRepPrimAPI_MakePrism and then BRepAlgoAPI_Cut? Maybe you can advice me another method - my task is to make a hole in a complex solid. Currently i make prism using BRepPrimAPI_MakePrism and then i cut the solid with this prism using BRepAlgoAPI_Cut.
Thanks in advance, Dima
Mon, 11/13/2000 - 12:30
Hi !
BRepPrimAPI_MakePrism will just create an extruded shape.
BRepFeat_MakePrism will create a prism and add or delete it from a shape (I think this use BRepAlgoAPI_Cut to remove the prism).
BRepAlgoAPI_Cut will cut away one shape from another.
As usual I may be wrong so please correct me in that case.
Mikael
Mon, 11/13/2000 - 13:40
> Hi !
Hi!
> BRepPrimAPI_MakePrism will just create an
> extruded shape.
Yes, i understand
> BRepFeat_MakePrism will create a prism and
> add or delete it from a shape (I think this
> use BRepAlgoAPI_Cut to remove the prism).
i think so
> BRepAlgoAPI_Cut will cut away one shape from
> another.
> As usual I may be wrong so please correct me
> in that case.
> Mikael
Yes, Mikael, but is this only way to make hole in a solid? I used profiler and found that BRepAlgoAPI_Cut operation on a slow PC (Celeron 433 MHz) takes 7.25 seconds and BRepFeat_MakePrism::Perform takes 7,35 seconds. It's terrible - imagine regeneration of 50 holes!
Best regards, Dima
Mon, 11/13/2000 - 14:15
> Hi!
> Yes, i understand
I am not sure I do ...
> i think so
I do not think so : it uses the concept of local operation, smarter than boolean (see LocOpe)
> Yes, Mikael, but is this only way to make
> hole in a solid? I used profiler and found
> that BRepAlgoAPI_Cut operation on a slow PC
> (Celeron 433 MHz) takes 7.25 seconds and
> BRepFeat_MakePrism::Perform takes 7,35
> seconds. It's terrible - imagine
> regeneration of 50 holes!
No it's not ! So try and tell us !
> Best regards, Dima
Regards, Philippe
Mon, 11/13/2000 - 13:40
Hi
Algo of BRepFeat_MakePrism is based on local boolean operation (see LocOpe package) and can make hole in shape faster then topological operation "cut" (BRepAlgoAPI_Cut) between shape and cylinder. But sometimes in case when local operation failes, algo calls cut of two shapes.
Igor,
Fri, 12/20/2002 - 00:18
Hello
I was wondering if you could ever get the BRepAlgoAPI_Cut perform any better, or did you find any other alternative.
I am in a very simialr situation, making shapes with 60 or more holes and it took almost 4 minutes on a 2GHz Windows XP machine. This is simply not acceptable.
Any help is appreciated.
Thanks
Monty Sagar