Partial surfaces - parameteric parameters in the limits?

 
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bugman



Joined: 05 Mar 2010
Posts: 2

PostPosted: Mon Mar 08, 2010 1:18 pm    Post subject: Partial surfaces - parameteric parameters in the limits? Reply with quote

Hi,

I was wondering if it is possible to place the parametric equation parameters, u or v, into the limits? The purpose is to display a subset of the surface of a sphere. For example the surface within the intercept of the sphere and an elliptic cone. Here the polar angle limit would be dependent on the azimuthal angle.

Cheers,

Edward
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nextstep
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Joined: 06 Jan 2007
Posts: 538

PostPosted: Wed Mar 10, 2010 7:52 am    Post subject: Reply with quote

Hi,
Quote:
The purpose is to display a subset of the surface of a sphere. For example the surface within the intercept of the sphere and an elliptic cone.

Maybe the easy way to do it is by using the implicit formula of the elliptic cone as a condition to limit the surface of the parametric sphere (activate the "CND" area in the K3DSURF menu). Of course a parametric formula that describe exactly this part of the surface should be feasible (Parametric formulas are however much more complicated to work with than the isosurfaces)
Quote:
I was wondering if it is possible to place the parametric equation parameters, u or v, into the limits?...
Here the polar angle limit would be dependent on the azimuthal angle.

I didn't fully understand your purpose and a representative image would help to understand your need.
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Abderrahman
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bugman



Joined: 05 Mar 2010
Posts: 2

PostPosted: Fri Mar 12, 2010 4:17 pm    Post subject: Reply with quote

I haven't managed to make this work through CND. And k3dsurf 0.6.2 currently segfaults on my Linux laptop (it works on my other radeon system that I don't currently have access to). Is there somewhere I can upload a picture of this? I've created some wireframe models demonstrating the concept. The purpose is to show the rotational distribution of a unit vector whereby the rotation is restricted to be within various cone-like objects (i.e. the result is a 3D partial surface of a sphere). For example the polar angle phi is restricted to the maximum value of:

phi_max^2 = (phi_x*cos(theta))^2 + (phi_y*sin(theta))^2,

where phi_x and phi_y are the maximum and minimum cone angles, and theta is the azimuthal angle.
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nextstep
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Joined: 06 Jan 2007
Posts: 538

PostPosted: Fri Mar 12, 2010 5:49 pm    Post subject: Reply with quote

Hi,
Quote:
I haven't managed to make this work through CND. And k3dsurf 0.6.2 currently segfaults on my Linux laptop (it works on my other radeon system that I don't currently have access to)

The last version K3DSurf 0.6.2.4 should work.
Quote:
Is there somewhere I can upload a picture of this?

There is http://img.rock-hosting.com or www.flickr.com
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Abderrahman
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