RE: drawing 3D lines and OpenGL viewer

From: Olivier Couet <Olivier.Couet_at_cern.ch>
Date: Wed, 7 Feb 2007 14:48:31 +0100

On my linux box the display is fast using x3D or OpenGL. I do not see any problem.
- X3D is on linux only.
- Why can you not use OpenGL on Linux ? It is not installed on you Ubuntu box ?
- You do not have hardware limitation. Your machine is more powerful than mine.

---

From: owner-roottalk_at_pcroot.cern.ch
[mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of John Zoidberg Sent: Wednesday, February 07, 2007 2:22 PM To: Valeriy Fayn
Cc: roottalk_at_root.cern.ch
Subject: Re: [ROOT] drawing 3D lines and OpenGL viewer

Here's the program as it is now.
Some comments inside the program are unfortunately in french.

The goal is to visualize the solid angle of a cylinder seen from a gaussian source.

The program for displaying is display_3D.C. In fact, the title of my first mail is misleading because I also wanted to talk about a problem I had with openGL, but didn't talk about it in the end.

When I run display_3D under windows, I can use the GLviewer but not the X3D viewer.
Under Linux Ubuntu v6.10 (edgy eft), it's the opposite: I can run X3D, but not GLviewer.

Here are my system specs:

-video card: ATI Radeon IGP 345M with 64 MB memory
-448 RAM (=512-64)
-Pentium 4 with 2.4 GHz

Software:
-Under Linux Ubuntu: ROOT v5.09/01
-Under Windows: I don't know exactly right now, but probably ROOT v5.14/00 since I downloaded the latest from the root page not so long ago.

John

On 2/6/07, Fine, Valeri <fine_at_bnl.gov> wrote:

        Hello John         

> I am trying to draw lines in a 3D display.
> Currently, I am using a TPolyMarker3D object and the setpoint

	function.


	> The problem is that once I draw about 600000 or more points

(3000 
	lines > ith 200 points), the display becomes very slow.
	
	You numbers does not look horrible.
	They are about two times as less as the average STAR Au-Au
events.
	http://www.star.bnl.gov/STAR/comp/vis/OnLineEventDisplay.html
	

http://www.star.bnl.gov/STAR/comp/vis/OnLineEventDisplay/AuAu200Animated

        Small.gif         

        those we have no problem to visualize with STAR Event Displays, both

        "Online" and "Offline". Online means one has to update the screen in

        real time follow the data taking rate.         

> I wanted to know if there already exists some function
> drawing 3D lines > which is better optimized.
> Because as I understand it, if the 3D viewer considers every
point as

	a 3D > object, he will calculate the rotation for every 


	> point instead of simply > rotating the "line".

	
	What is your video hardware and entire hardware environment? I
am
	wondering if the slowdown you observed is not OpenGL hardware
fault. The
	problem is elsewhere.
	
	Can you send (upload) me your data file and ROOT macro to play

with.         

        Thank you                                                      

        Mike          Received on Wed Feb 07 2007 - 14:49:05 CET