Re: [COOT] Dashed Lines

2009-02-17 Thread Petra Lukacik

Hello All,
I just wanted to follow up the "Dashed Lines" thread
I upgraded to Ubuntu 8.10 (Intrepid Ibex) and I reinstalled the fglrx  
video card driver (xorg-driver-fglrx). I don't know what exactly did the 
trick but I no longer have the "dashed lines" problem. 
Oh and I am currently using coot-Linux-i686-ubuntu-8.04.1-gtk1 from binary.

Victory is mine!
Petra


Paul Emsley wrote:

Petra Lukacik wrote:

Hello everyone,


Hello Petra,

We have had reports of something very similar in the past.  I think it 
is more than likely a bug in the graphics driver - the stipple pattern 
for lines is not properly turned off when it should be (and as you 
say, that has nothing to do with Coot).  You may not have seen this in 
other graphics applications because (I imagine) other programs are 
more sophisticated in the way they represent graphical objects (i.e. 
not with primitive GL_LINES like Coot does) - they use more widely 
tested solid surfaces.


I don't know what you can do, other than badger your graphics card 
driver provider (I'd be willing to work with them to address this, for 
the record).


Maybe intrepid would be better? - just guessing of course.

Paul.

p.s. I am jealous of your big screen :)  My best computer has a 19in 
screen and will collapse in a big heap if you try to use both processors.







Re: [COOT] Dashed Lines

2009-02-17 Thread Paul Emsley

First: good.

Second: a technical note: recently I discovered that many (most?) 
consumer graphics cards do not support GL_LINES [1] for line widths 
other than 1 pixel - they simulate them using OpenGL quads 
(quadrilaterals), so it is not completely surprising that somehow the 
simulation was messed up.  In future, I will probably move Coot to using 
quads directly to bypass the simulation - it may speed things up...


Paul.


[1] which is what Coot uses to represent most things.

Petra Lukacik wrote:

Hello All,
I just wanted to follow up the "Dashed Lines" thread
I upgraded to Ubuntu 8.10 (Intrepid Ibex) and I reinstalled the fglrx  
video card driver (xorg-driver-fglrx). I don't know what exactly did 
the trick but I no longer have the "dashed lines" problem. Oh and I am 
currently using coot-Linux-i686-ubuntu-8.04.1-gtk1 from binary.

Victory is mine!
Petra