[vtkusers] Re: Render takes 30 seconds on ATI Mobility Radeon 9700

[Goodwin Lawlor]

Hi Per,
I ran your test using the tcl command "time {data Modified; renWin Render}
30" to calculate the times *per iteration*. I ran it twice- once with the
default mapper settings and once with ImmediateModeRenderingOn... here are
the times:

Iterations IMR-Off          IMR-On
1             0.426083         0.108912
2             0.691857         0.079707
5             0.850134         0.06161
10           0.908248         0.054428
20           0.943922         0.04934
30           0.981068         0.048095

Its pretty clear that for a large dataset ImmediateModeRendering gives
better rendering times. The GeForce card must handle retained mode rendering
more efficiently than then the ATI...

hth

Goodwin



----- Original Message ----- 
From: Per R. Andresen
To: 'Goodwin Lawlor'
Sent: Thursday, September 09, 2004 7:21 PM
Subject: RE: Render takes 30 seconds on ATI Mobility Radeon 9700


Dear Goodwin,

Thanks a lot; it will be very interesting to see.

I've the following measurements on my two computers:

30 iterations on GeForce FX 5200: 4 seconds
30 iterations on ATI Mobility Radeon 9700: 25 seconds
6 iteration on ATI Mobility Radeon 9700: 56 seconds! (when running from
Visual Studio .net 2003 in release mode)

I've included the tcl and that data set in this mail.

Per

PS: I'll post another message on the mailing list soon with exact
measurements. Some of the problem seems to be due to the debugger in Visual
Studio .net 2003

-----Original Message-----
From: Goodwin Lawlor [mailto:goodwin.lawlor at ucd.ie]
Sent: 9. september 2004 13:02
To: Per R. Andresen
Subject: Re: Render takes 30 seconds on ATI Mobility Radeon 9700

Hi Per,

If you can post a test tcl script I'll run it on this machine:
Dell Inspiron 8600, 1.7GHz, 512MB RAM, ATI Mobility Radeon 9600 128MB

Goodwin
----- Original Message ----- 
From: Per R. Andresen
Newsgroups: gmane.comp.lib.vtk.user
Sent: Thursday, September 09, 2004 11:39 AM
Subject: Render takes 30 seconds on ATI Mobility Radeon 9700

Dear VTK users,

I really need some help on this.

I have a very simple pipeline (polydata -> mapper -> actor -> vtkRenderer ->
vtkRenderWindow -> vtkRenderWindowInteractor) and the polydata contains
20.000 points.

The following loop takes 30 seconds pr. iteration on a Dell Inspiron 9100,
3.2Ghz, 1 Gb RAM, ATI Mobility Radeon 9700 128 Mb, XP service pack 2:

for (int n=0; n<40; n++)
{
   cerr << "n = " << n << "\n";
   pPolyData->Modified();
   pRenWin->Render();        // uses 30 seconds!!
 }

On a Dell Dimension 8300 with GeForce Fx 5200 it takes less than a second.

I've upgraded with the latest graphics drives from Dell, also tried Omega
drivers (http://www.omegadrivers.net/), ran the code on VTK42 DLLs
(vtk42-LatestRelease.exe) and VTK44 (source downloaded and build) but
nothing seems to help.

Any advices would be very much appreciated.

Thanks in advance,
Per







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