[Netgen] Ellipsoids at an angle

beefstu · October 25, 2010, 14:56

Hi all,

I'm trying to mesh an ellipsoid positioned at an angle but cant seem to get it to work. The .geo that I'm trying is as follows:

Code:

algebraic3d

solid ellips1 = ellipsoid (0.0,0.0,0; 3.9392310120488321,0,0.69459271066772166; 0,4,0; 1.7364817766693041,0,9.8480775301220795);
tlo ellips1;

To explain what i did, basically its fine generating an ellipsoid on one of the axes so to try to rotate it slightly, I used trigonometry to work out the new positions of the axes of the ellipsoid, hence the long floats, this should be rotated by 10deg anticlockwise which seems to be what it has done except it has huge holes in it and won't mesh!

For information, the formulae used are as follows:

Code:

ellipsoid (0.0,0.0,0; 4sin(80),0,4cos(80); 0,4,0; 10cos(80),0,10sin(80));

I would appreciate any pointers!

Many thanks
Stu

beefstu · October 27, 2010, 17:05

ok solved this myself - was being foolish with the vectors, the 10cos(80) should have been negative, was a self-inflicted error, nothing to do with Netgen!

October 25, 2010, 14:56	Ellipsoids at an angle	#1
beefstu New Member Stuart Join Date: Oct 2010 Posts: 2 Rep Power: 0	Hi all, I'm trying to mesh an ellipsoid positioned at an angle but cant seem to get it to work. The .geo that I'm trying is as follows: Code: algebraic3d solid ellips1 = ellipsoid (0.0,0.0,0; 3.9392310120488321,0,0.69459271066772166; 0,4,0; 1.7364817766693041,0,9.8480775301220795); tlo ellips1; To explain what i did, basically its fine generating an ellipsoid on one of the axes so to try to rotate it slightly, I used trigonometry to work out the new positions of the axes of the ellipsoid, hence the long floats, this should be rotated by 10deg anticlockwise which seems to be what it has done except it has huge holes in it and won't mesh! For information, the formulae used are as follows: Code: ellipsoid (0.0,0.0,0; 4sin(80),0,4cos(80); 0,4,0; 10cos(80),0,10sin(80)); I would appreciate any pointers! Many thanks Stu

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October 27, 2010, 17:05		#2
beefstu New Member Stuart Join Date: Oct 2010 Posts: 2 Rep Power: 0	ok solved this myself - was being foolish with the vectors, the 10cos(80) should have been negative, was a self-inflicted error, nothing to do with Netgen!