[osg-users] how to draw a Curved Surface?

[Bean Bean]

primitive problem
<https://groups.google.com/forum/#!searchin/osg-users/how$20to$20draw$20a$20Curved$20Surface$20on$20the$20top$20of$20terrain$3F/osg-users/q0fcYqNZ84E/LqfRH3rBrTUJ>

<https://groups.google.com/forum/#!searchin/osg-users/how$20to$20draw$20a$20Curved$20Surface$20on$20the$20top$20of$20terrain$3F/osg-users/q0fcYqNZ84E/LqfRH3rBrTUJ>


1、how to draw a Curved Surface on the top of terrain? like the fig.
2、how to compute the surface area of the Curved Surface?
[image: 内嵌图片 1]
I  want to use  polytope intersector, but I don't have  inspiration. So can
you give me some advise?
thank you a lot.
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