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[刘先勇 <>]

I am quite not understood to "Your points are almost coplanar but are not exactly coplanar. ".

How do get this result? Please kindly let us know your judgement. 

I tested the four corners of a face, the inexact Jacobian value is 8.84307e-9. How can we deduce that they are almost coplanar.

2013/4/10 Sebastien Loriot (GeometryFactory) <>

I suggest to read [1].

According to your coordinate I don't believe they are really coplanar.
Moreover, depending on how you read the data (the closest double or the
rational number), you won't have the same input points.

Your points are almost coplanar but are not exactly coplanar.


[1] http://www.cgal.org/FAQ.html#inexact_NT

On 04/10/2013 09:24 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



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  Regards,
  Xianyong Liu
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