export option request

 
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tomot



Joined: 21 Jul 2007
Posts: 23
Location: Vancouver

PostPosted: Sat Apr 11, 2009 5:10 pm    Post subject: export option request Reply with quote

Taha: is it possible to add 2 more export options in the near future?

1. option to retain or delete the contour lines in a model.
2. option to exports quads instead of triangular meshes.

At present there are not many programs that allow UV editing
and even if they do, the process it can become very time consuming.

Some programs such as ParaCloud Gem use the UV's for further
model development.

thanks!
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nextstep
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Joined: 06 Jan 2007
Posts: 538

PostPosted: Sun Apr 12, 2009 8:21 pm    Post subject: Reply with quote

Hi tomot,
I didn't understand what you mean with "contour lines"...can you explain with an example (or a simple image).
The second proposed option is more difficult to be done in the near future since the actual algorithm used to generate isosurfaces in K3DSurf isn't suitable for it. Of course we can generate polgones with triangles by using some mesh-editing algorithm (as with ParaCloud) but K3DSurf needs a much more versatile algorithm to generate such polygons from an isosurface (I frankly don't know if such thing is even possible).
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Abderrahman
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tomot



Joined: 21 Jul 2007
Posts: 23
Location: Vancouver

PostPosted: Sun Apr 12, 2009 9:48 pm    Post subject: Reply with quote

nextstep wrote:
Hi tomot,
I didn't understand what you mean with "contour lines"...can you explain with an example (or a simple image).

I hope this pic is large enough to see, what I call contours?



Another question; is it possible to produce more precise trianglular mesh such as this open torus pic shows ? This open torus example was produced from a math java applet program. I think the K3Dsurf torus suffers from more precise triangular meshing in some part due to the contour lines that run around it.



I hope you don't take my comments negatively Smile
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nextstep
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Joined: 06 Jan 2007
Posts: 538

PostPosted: Mon Apr 13, 2009 4:23 pm    Post subject: Reply with quote

Hi,
Quote:

I hope this pic is large enough to see, what I call contours?
I hope you don't take my comments negatively Smile

Oh no, we have a very large open mind here Very Happy
You can eliminate those contours but you will loose the resolution of your model. This can be seen by using the "grid resolution" tool in K3DSurf : change the "X" grid value (for example), and see what will happen to your model... In fact, the number of those contours corresponds to the X, Y and Z resolution. Some models (a Cube for example) is well defined by a low grid resolution but this is not the case of complex models like yours.


Quote:
Another question; is it possible to produce more precise trianglular mesh such as this open torus pic shows ? This open torus example was produced from a math java applet program.

yes, by using the Parametric representation of the Torus in K3DSurf.
Your picture is a Parametric representation of a Torus and K3DSurf can also generate those representation.



Quote:
I think the K3Dsurf torus suffers from more precise triangular meshing in some part due to the contour lines that run around it.

yes but we can't help it: reduce the number of contours and the quality of the shape goes down sharply... Evil or Very Mad
In fact there is a very simple solution to those problems but this can be a highly difficult (and hair costly Very Happy ) task : take your isosurface formula and change it to a parametric representation
Hope this can help...
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Abderrahman
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