Actually, what I would like to do is to make a volume

which is obtained by cutting a pyramid with a sphere centered at a vertex

of the pyramid.

So the five sides of the volume are on planes but one is a spherical

surface.

I tried to use the copy tool but the rotation of a curve on the sphere

could not produce the full spherical surface..

Is there an easy way to construct that kind of volume?

Thank you,

Seungil.

On Sat, Nov 23, 2013 at 12:29 AM, Enrique Escolano

escolano at cimne.upc.eduwrote:

*If you create a surface defined only ‘by its boundary lines’ then the*

*shape of the surface must match these lines, but the inner shape is freely*

*created (by a kind of coons or bicubical interpolation). It shape won’t*

*necessarily be what you are expecting, e.g. won’t be spherical*

*You can create a perfect spherical surface by revolution with extrusion*

*(copy tool),*

*but you must know its revolution axis (two coordinates to define it), and*

*have some curve on the surface to be extruded (e.g. an arc)*

*If the ‘full surface’ doesn’t has the required lines as boundary, then you*

*can create a trimmed surface, trimming the ‘base surface’ with its boundary*

*lines.*

*Enrique*

**De:* gidlist-bounces at listas.cimne.upc.edu [mailto:*

*gidlist-bounces at listas.cimne.upc.edu] *En nombre de *Seungil Kim*

**Enviado el:* viernes, 22 de noviembre de 2013 16:11*

**Para:* gidlist at listas.cimne.upc.edu*

**Asunto:* [GiDlist] how to create a surface on a sphere*

*Dear Sir,*

*I have four curves on a unit sphere.*

*When I used "Create NURBS surface" to create a surface bounded by the four*

*curves,*

*I expected a surface on a surface but it doesn't seem to be a part of*

*sphere..*

*Is it possible to create a spherical surface when the four bounding curves*

*are on a sphere?*

*Thanks,*

*Seungil.*

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