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List: vtkusers
Subject: Re: [vtkusers] Re: Simple Collision Detection between camera and
From: Goodwin Lawlor <goodwin.lawlor () ucd ! ie>
Date: 2007-01-31 15:50:03
Message-ID: 45C0BAAB.20105 () ucd ! ie
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Chris Hughes wrote:
> Hi Goodwin,
>
> The vtkOBBTree looks like it could do exactly what I need. However I am
> really struggling to get it to work. I have a closed polygon mesh and I
> have ried to set up he OBBTree like this:
>
> vtkOBBTree *obbTree = vtkOBBTree::New();
> obbTree->SetDataSet(vPolyDataReader->GetOutput());
> obbTree->SetMaxLevel(10);
> obbTree->BuildLocator();
>
> I then have a look which runs a simulation and moves the camera around
> and include:
>
> ioo = obbTree->InsideOrOutside(ren1->GetActiveCamera()->GetPosition());
>
> However this causes the application to compile but crash with a 'has
> encountered a problem and needs to close' style error. Any suggestions?
>
> Many thanks..
>
> Chris
Hi Chris,
Could be a couple of things... Try:
1. vPolyDataReader->Update();
before setting it in the OBB tree.
2. Rather than passing the pointer, it's usually safer to try:
double pt[3];
ren1->GetActiveCamera()->GetPosition(pt);
ioo = obbTree->InsideOrOutside(pt);
hth
Goodwin
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