cmhking

To best make use of Fedora Seven with Houdini & nvidia graphic cards, I suggest that you go to http://rpm.livna.org/rlowiki/LivnaSwitcher [rpm.livna.org] & follow their advice. This worked for me with Nvidia Quadro cards, not sure about ATI.

I using Houdini 8.0.620 on a machine running a Quadro FX1100 with Fedora Core 5 linux and the xorg-x11-drv-nvidia.i386 driver (1.0.8762-3.lvn5)
I get a lockup of the UI when trying to use the Image.desktop for COPS.
¨X11 Error (16): BadLength (poly request too large or internal Xlib length error)¨
Anyone seen this before? Suggestions?
Fedora Core 4 does not have this problem.

There is a choice of 2 cmd files that must be placed in the Pre-Include box of the Render tab of your Camera object.
In the attached example hip, the cmd file is placed in your /tmp folder.
For odd field dominance, the .cmd is..
# Specification of fields
# Renders the odd field first
set frame = $arg1
set delta = `round($frame*2)%2-.5`
set y0 = `$delta/576-0.5`
set y1 = `$delta/576+1.5`
ray_window 0 1 $y0 $y1
echo $delta
echo $y0
echo $y1
……………………….
For even field dominance
# Specification of fields
# Renders the even field first
set frame = $arg1
set delta = `round($frame*2+1)%2-.5`
set y0 = `$delta/576-0.5`
set y1 = `$delta/576+1.5`
ray_window 0 1 $y0 $y1
echo $delta
echo $y0
echo $y1
………………………
However you will need to test this out properly, because for a good result in PAL, against the logic. I used the even field script with an even field dominance fieldmerge COP to get the correct result.
I am not able to explain why this is so