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bugman
Joined: 05 Mar 2010 Posts: 2
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Posted: Mon Mar 08, 2010 1:18 pm Post subject: Partial surfaces - parameteric parameters in the limits? |
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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 Site Admin
Joined: 06 Jan 2007 Posts: 539
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Posted: Wed Mar 10, 2010 7:52 am Post subject: |
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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. _________________ Cheers,
Abderrahman |
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bugman
Joined: 05 Mar 2010 Posts: 2
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Posted: Fri Mar 12, 2010 4:17 pm Post subject: |
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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 Site Admin
Joined: 06 Jan 2007 Posts: 539
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Posted: Fri Mar 12, 2010 5:49 pm Post subject: |
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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 _________________ Cheers,
Abderrahman |
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