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Re: about DXF format [message #54486 is a reply to message #54401]

Tue, 12 June 2007 16:24

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

> Second,we know,sometimes,it just need one IDLgrPolygon
> object to display a polygon which be composed by a lot of
> triangles.
> But when I loading some DXF files, the GetEntity method
> shows a very bad result.It produed many many IDLgrPolygons,so much as
> decomposed some polygon entitys.That makes my program became very
> slow ,and need to wait a long time for it .

I could be wrong, I have never actually looked, but I thought that the
entities are defined in the DXF file. So there isn't a problem with
GetEntity. Your issue is that your DXF files are more complicated than
you would like.

> Is there any better way to avoid making too many
> IDLgrPolygons through GetEntity method?

Ideally you fix this at the source, whatever program you are exporting
your DXF models from. Alternatively you could combine entities into a
single IDLgrPolygon by concatenating the vertex arrays and applying the
proper offsets to the polygon arrays. It's hard to say how much this
would speed things up since it depends on where your bottleneck lies.
If your program is burdened by the overly complex graphics hierarchy
(too many IDLgrPolygon objects) this will help. But if you simply have
too many polygons on your screen this will do little in terms of
improving performance.

What hardware and OS are you running IDL on? How many polygons are you
trying to display?

-Rick

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[Message index]

		about DXF format By: airy.jiang on Tue, 12 June 2007 03:36
		Re: about DXF format By: airy.jiang on Sat, 16 June 2007 19:20
		Re: about DXF format By: JMZawodny on Mon, 18 June 2007 05:23
		Re: about DXF format By: airy.jiang on Wed, 13 June 2007 19:07
		Re: about DXF format By: airy.jiang on Wed, 13 June 2007 18:51
		Re: about DXF format By: Andrew Cool on Tue, 12 June 2007 16:45
		Re: about DXF format By: Rick Towler on Tue, 12 June 2007 16:24
		Re: about DXF format By: airy.jiang on Tue, 19 June 2007 08:20
		Re: about DXF format By: Vince Hradil on Mon, 18 June 2007 08:14
		Re: about DXF format By: Vince Hradil on Mon, 18 June 2007 07:55
		Re: about DXF format By: JMZawodny on Thu, 21 June 2007 06:51
		Re: about DXF format By: airy.jiang on Tue, 26 June 2007 21:12
		Re: about DXF format By: Vince Hradil on Wed, 27 June 2007 06:39
		Re: about DXF format By: Rick Towler on Thu, 21 June 2007 09:26
		Re: about DXF format By: JMZawodny on Thu, 28 June 2007 10:58
		Re: about DXF format By: Vince Hradil on Thu, 21 June 2007 07:50
		Re: about DXF format By: JMZawodny on Fri, 29 June 2007 05:30
		Re: about DXF format By: Vince Hradil on Thu, 28 June 2007 12:23
		Re: about DXF format By: JMZawodny on Thu, 28 June 2007 11:37

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