[vtkusers] Trouble with Volume and a Plane

[Lisa S. Avila]

Hello Jon,

I don't think you mention what version of VTK you are using. A while ago
(maybe in 3.2?) there was a bug where texture mapping (in OpenGL) would be
disabled by some of the volume mappers, which would mess up the rendering of
texture mapped polygons. This bug has been fixed in VTK 4.0. Are you certain
the plane is not being rendered, or is it just being rendered in black?
Finally, can you demonstrate this problem in a simple tcl script relying
only on data available in VTKData / on the VTK CDROM?

Thanks,

Lisa

----- Original Message -----
From: "jon n" <elwo73 at hotmail.com>
To: <vtkusers at public.kitware.com>
Sent: Thursday, March 14, 2002 7:21 PM
Subject: Re: [vtkusers] Trouble with Volume and a Plane


> actually, when I first display the actor using SetVisibilityOn() it shows
up
> fine. but as soon as I move the center of the plane, even if I move it to
> where it originally was set, it disappears.
>
> i've compared what I get from printing out the actor after it shows up and
> after it disappears and the results are strange. right after it shows up
it
> lists the lookup table as none and property as none, even though the
texture
> of the plane has a lookup table associated with it. after it disappears it
> gets a lookup table and property. here is a comparison of what these
> sections:
>
> ...
>     Lookup Table: (none)
> ...
>   Property: (none)
>
> and after it disappears:
>
>     Lookup Table:
>       Debug: Off
>       Modified Time: 1607
>       Reference Count: 1
>       Registered Events: (none)
>       Alpha: 1
>       TableRange: (0, 1)
>       Scale: Linear
>       HueRange: (0, 0.66667)
>       SaturationRange: (1, 1)
>       ValueRange: (1, 1)
>       AlphaRange: (1, 1)
>       NumberOfTableValues: 256
>       NumberOfColors: 256
>       Ramp: SCurve
>       InsertTime: 0
>       BuildTime: 0
> ...
>   Property:
>     Debug: Off
>     Modified Time: 1591
>     Reference Count: 1
>     Registered Events: (none)
>     Ambient: 0
>     Ambient Color: (1, 1, 1)
>     Diffuse: 1
>     Diffuse Color: (1, 1, 1)
>     Edge Color: (1, 1, 1)
>     Edge Visibility: Off
>     Interpolation: VTK_GOURAUD
>     Opacity: 1
>     Representation: VTK_SURFACE
>     Specular: 0
>     Specular Color: (1, 1, 1)
>     Specular Power: 1
>     Backface Culling: Off
>     Frontface Culling: Off
>     Point size: 1
>     Line width: 1
>     Line stipple pattern: 65535
>     Line stipple repeat factor: 1
>
> >From: "jon n" <elwo73 at hotmail.com>
> >To: vtkusers at public.kitware.com
> >Subject: [vtkusers] Trouble with Volume and a Plane
> >Date: Thu, 14 Mar 2002 15:14:21 -0800
> >
> >hi,
> >
> >I have a render window which gets switched between a Volume render and an
> >isocontour Actor. If I have the isocontour Actor showing and then show
this
> >other plane actor, it works fine. But if I have the Volume showing and
then
> >show the plane, the plane flashes on and then disappears and even if I
> >switch to viewing the isocontour the plane still will not show. The plane
> >is
> >at z=-0.1 to prevent it from interfering with the Volume and isocontour.
is
> >there something strange about planes and volumes being together?
> >
> >thanks
> >
> >
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>
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