[vtkusers] Re: Lighting problem

Tue Feb 22 00:44:32 EST 2005

Problem solved. All is well and vtkLightKit is not the problem. I had
the classic of by one error which caused one of my actors to be moved by
a huge amount which then caused a weird clipping problem. So what looked
like dissappearing was actually clipping. Don’t really understand it but
its fixed and my confidence in VTK is restored. Thanks for the help

Paul

-----Original Message-----
From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On
Behalf Of Paul Tait
Sent: Tuesday, 22 February 2005 8:52 AM
To: vtkusers at vtk.org
Subject: RE: [vtkusers] Re: Lighting problem

Sorry should of told you I'd already tried that. It does the same but
its dimmer. Just using plain old 4.2. with the
vtkWin32RenderWindowInteractor I'm going to try an jiffy something up in
python that exhibits the problem.

Paul

-----Original Message-----
From: Goodwin Lawlor [mailto:goodwin.lawlor at ucd.ie] 
Sent: Monday, 21 February 2005 9:28 PM
To: Paul Tait
Subject: Re: [vtkusers] Re: Lighting problem

Hi Paul,

Sounds like there is a bug in the interactor style when using
vtkLightKit... which one are you using?

Have you tried your scene without the light kit and just the default
light setup? Does it have the same problem?

I tried an example I have with the light kit and it works ok when moving
actors around. What version of VTK are you using?

Goodwin

----- Original Message ----- 
From: "Paul Tait" <paul at opes.com.au>
To: "'Goodwin Lawlor'" <goodwin.lawlor at ucd.ie>
Sent: Monday, February 21, 2005 4:56 AM
Subject: RE: [vtkusers] Re: Lighting problem

> Hmmmmm
>
> As I understand it vtkLightKit uses parallel light sources so distance

> shouldn't make any difference. Interestingly when I first move my
> actors they display correctly but only dissappear when I move them 
> with the mouse. Also I leave the position of my top (vertically 
> speaking) actor the same so you would think that it would still be lit

> correctly.
>
> Paul
>
> To: vtkusers at public.kitware.com
> Subject: [vtkusers] Re: Lighting problem
>
>
> Hi Paul,
>
> Try transforming your lights (position and focal point) by the actors
> transform. Maybe try actor->GetMatrix(matrix);
> light->SetTransformMatrix(matrix).
>
> I'd guess that the other actors in your scene wont look right then
> though... try moving the light position back along the direction of 
> projection instead.
>
> hth
>
> Goodwin
>
> "Paul Tait" <paul at opes.com.au> wrote in message
> news:007a01c5158a$f1fff200$af0aa8c0 at DEEPTHROAT...
> > More info to perhaps pique your interest
> >
> > I'm moving my actors around with actor->AddPosition(0, 0, deltaZ)
> >
> > I can see the bottom of my actors but as soon as I get above the
> > horizontal its as if the lights switch off.  This only happens AFTER

> > I've used actor->AddPosition(0, 0, deltaZ) Before that I can view
> > them
>
> > from any angle.
> >
> > Paul
> >
> > -----Original Message-----
> > From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On
> > Behalf Of Paul Tait
> > Sent: Thursday, 17 February 2005 5:21 PM
> > To: vtkusers at vtk.org
> > Subject: [vtkusers] Lighting problem
> >
> >
> > I've just modified my VTK app to accentuate the vertical distances
> > between some oil reservoirs. Everything goes fine till  start moving

> > the model around. From many angles the it just shows black. By
> > moving around to another position I can see it again. I'm using a 
> > plain vtlLightKit which normally works really well for me. Do I have

> > to inform it or something else of the change in the scene ?
> >
> > Paul Tait
> >
> > PS Wil... Hows my high contrast LUT coming on ?
> >
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