'[vtkusers] How to use vtkOBBTree?'

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List: vtkusers
Subject: [vtkusers] How to use vtkOBBTree?
From: shiyuan <shiyuan001 () hotmail ! com>
Date: 2007-11-29 14:03:51
Message-ID: BAY139-W3BB76F4D64AF589D8A56F8F700 () phx ! gbl
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Hi,All
I want to compute Oriented Bounding Box of a STL model(a kind of polygonal model) to \
get three lengths of the OBB and I find vtkOBBTree has a member function :  
void vtkOBBTree::ComputeOBB(  vtkPoints *  pts,    double  corner[3],    double  \
max[3],    double  mid[3],    double  min[3],    double  size[3]  )  
I guess this function can help me. From VTK Documentation,I got the following \
description:  
Compute an OBB from the list of points given. Return the corner point and the three \
axes defining the orientation of the OBB. Also return a sorted list of relative \
"sizes" of axes for comparison purposes.   
After wrote a test program, I found the max[3],mid[3] and min[3] specify three \
vectors which is orthogonal by ones and twos and they can form a coordinate system. \
But I don't know the meaning of arguments "corner[3]" and "size[3]" above exactly.If \
argument "corner[3]" specify the "minimum" point of the OBB,but the "corner[3]" value \
is less than "minimum" point of AABB when I test the same model.  
Could someone please give me some help? I want to know:1.what are the arguments mean \
in Function ComputeOBB()?2.Is there any other methods to compute OBB of a polygonal \
model? I just need the three lengths of the OBB.  Thanks in advance.  

Dest wishes,
SHIYuan

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Hi,All 
 I want to compute Oriented Bounding Box of a STL model(a kind of polygonal model) \
to get three lengths of the OBB and I find vtkOBBTree has a member function : \
&nbsp; void vtkOBBTree::ComputeOBB(&nbsp; vtkPoints *&nbsp; pts,&nbsp; &nbsp; \
double&nbsp; corner[3],&nbsp; &nbsp; double&nbsp; max[3],&nbsp; &nbsp; \
double&nbsp; mid[3],&nbsp; &nbsp; double&nbsp; min[3],&nbsp; &nbsp; \
double&nbsp; size[3] &nbsp;) &nbsp; 
I guess this function can help me. From VTK Documentation,I got the following \
description: &nbsp; 
Compute an OBB from the list of points given. Return the corner point and the three \
axes defining the orientation of the OBB. Also return a sorted list of relative \
"sizes" of axes for comparison purposes. &nbsp; 
After wrote a test program, I found the max[3],mid[3] and min[3] specify three \
vectors which is orthogonal by ones and twos and they can form a coordinate system. \
But I don't know the meaning of arguments "corner[3]" and "size[3]" above exactly.If \
argument "corner[3]" specify the "minimum" point of the OBB,but the "corner[3]" value \
is less than "minimum" point of AABB when I test the same model. &nbsp; 
Could someone please give me some help? I want to know: 1.what are the arguments \
mean in Function ComputeOBB()? 2.Is there any other methods to compute OBB of a \
polygonal model? I just need the three lengths of the OBB. &nbsp; Thanks in \
advance. &nbsp; 
&nbsp; 
Dest wishes, 
SHIYuan 
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