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point inside/outside of 3D object. [message #76567]

Tue, 14 June 2011 12:01

Junum
Messages: 13
Registered: May 2010

Junior Member

I want to determine whether a given point is inside or outside of 3D
object.
There have been some suggestions on this discussion group, so I have
tried IDLanROI::ContainsPoints.
It works for 2D case, but not for 3D.
Assuming a tetrahedron,
its coordinates for 4 points are
(1,0,0)
(0,1,0)
(-1,0,0)
(0,0,1)

px = [1., 0., -1., 0.]
py = [0.,1.,0.,0.]
pz = [0.,0.,0.,1.]

object = Obj_New('IDLanROI', px, py, pz)
print,object->containspoints(0.1,0.1,0.1)

It prints 0, Exterior, although (0.1,0.1,0.1) is inside of
tetrahedron.

My questions are
1. I guess that a method defining a tetrahedron is wrong (i.e., px,
py, pz).
How can I define a 3D object consisting of several plane surfaces
(e.g., cube) in IDLanROI?

2. How can I draw a tetrahedron in 3D graphic?

Could you help me?
Thank you.

Sincerely,
Jun

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[Message index]

		point inside/outside of 3D object. By: Junum on Tue, 14 June 2011 12:01
		Re: point inside/outside of 3D object. By: Junum on Tue, 21 June 2011 10:22
		Re: point inside/outside of 3D object. By: Karl[1] on Tue, 21 June 2011 08:18
		Re: point inside/outside of 3D object. By: Wout De Nolf on Tue, 21 June 2011 02:24
		Re: point inside/outside of 3D object. By: Guneshwar Thangjam on Sat, 04 July 2015 12:55
		Re: point inside/outside of 3D object. By: Wout De Nolf on Tue, 21 June 2011 01:52
		Re: point inside/outside of 3D object. By: Karl[1] on Mon, 20 June 2011 12:57

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