CGAL users discussion list

[Cody Rose <>]

I recommend reading this: http://www.cgal.org/philosophy.html

On 4/10/2013 1:56 PM, 刘先勇 wrote:

Thanks for your reply, Evan .

I just used the simple function CGAL::coplanar. It always tells me that my testing data is non-planar.

Please reference http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Kernel_23_ref/Function_coplanar.html.

Also, I found another post about coplanarity from http://cgal-discuss.949826.n4.nabble.com/concrete-example-of-coplanar-points-td4312826.html.

Therefore, I am quite confused. If the Jacobian value is very near to 0, we say they are coplanar. The Jacobian value of the given data above is -8.48237e-008, but what's the standard to set a reasonable threshold?

Hopefully, somebody could share their experience if they met the same problem before.

Xianyong Liu.

2013/4/10 Evan Behar <>

> I just used  the following function to have a coplanar testing, found that it returns me false.

I'm sorry, I didn't see where you specified the function you used to do the coplanar test.

On Wed, Apr 10, 2013 at 3:24 PM, ayongwust_sjtu <> wrote:
This is the right testing data:

v1
[0] = -0.22209167480468750
[1] = 0.50670331716537476
[2] = 1.0210649967193604

v2

[0] = 0.59293586015701294
[1] = 0.45931974053382874
[2] = 0.95057666301727295

v3
[0] = 0.41287946701049805
[1] = 0.37877112627029419
[2] = -1.0771968364715576

v4
[0] = -0.40214806795120239
[1] = 0.42615470290184021
[2] = -1.0067086219787598

-----
-------------

 Regards,
 Xianyong Liu
--

View this message in context: http://cgal-discuss.949826.n4.nabble.com/co-planar-testing-tp4657160p4657162.html

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