[vtkusers] vtk44 ATI X1600 problems with textures over 2000 pixels

[nikolaus heger]

Thanks a lot for this information, David!

That saves me from further experimenting. It's clear it's either an ATI
driver limit or a hardware limit, so it's out of our control.

Too bad :(

This is certainly the last ATI card I bought.

cheers,
Nik


On 6/9/06, David.Pont at ensisjv.com <David.Pont at ensisjv.com> wrote:
>
>  "nikolaus heger" <nikolaus.heger at gmail.com> wrote on 08/06/2006 13:20:36:
>
> > Hi,
>
> >
> > I have a problem where textures over 2000 pixels show up as white
> > rectangles on my computer.
> >
> > It seems to be isolated to ATI cards - I have an X1600 with 256M / 512M
> RAM.
> >
> > Does anyone know if this affects all ATI cards, or can this be fixed
> > with a new driver or with vtk 5.0?
> >
> > Demo code in [1] shows the problem.
> >
> > Thanks for any help or info!
> >
> > Nik
> > [1]
> > import Tkinter
> > from Tkinter import *
> > import math, os, sys
> > from vtkpython import *
> > import vtk
> > from vtk.tk.vtkLoadPythonTkWidgets import vtkLoadPythonTkWidgets
> > filename = "demo_lg.jpg" # 2300 pixel high image - displays as white
> > rectangle on ATI cards.
> > #filename = "demo.jpg" # 2000 pixel high image - TOTALLY FINE
>
> I have experienced the white rectangle problem, on an ATI card too, but it
> just seems to be a physical limitation on maximum texture size. In C++ I
> used the following OpenGL call from inside my vtk app to find out the
> maximum:
>
>                                 long maxDimGL;
>
> glGetIntegerv(GL_MAX_TEXTURE_SIZE,&maxDimGL);
>
> I have no idea if you can access this in Tcl/Tk. I think there are OpenGL
> testbench programs out there that may report this number, perhaps you could
> look for one.
> The bottom line is this looks to be a hardware limit, you would have to
> add code to resample images down if they were larger than the reported limit
> on a given machine.
>
>   regards
>     Dave P
>
> >
> > reader = vtk.vtkImageReader2Factory.CreateImageReader2(filename)
> > reader.SetFileName(filename)
> > # set the window/level
> > viewer = vtkImageViewer2()
> > viewer.SetInput(reader.GetOutput())
> > viewer.SetColorWindow(100.0)
> > viewer.SetColorLevel(127.5)
> > viewer.Render()
> > #make interface
> > viewer.Render()
> > windowToimage = vtkWindowToImageFilter()
> > windowToimage.SetInput(viewer.GetRenderWindow())
> > frame = Frame()
> > frame.mainloop()
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