Merging surfaces

[evatucek]

hi!
I am trying to make hole (trim)in 1st nurbs surface and then merge it to 2nd. But merging will not work with projected curve. of course I can blend 2 nurbs, but I want to make only 1 surface as a result. (in fact I am tryung to add separately modeled eyes to my character) any ideas?
How to make separately eyes (its easyer) but after that merge with hand 2 one surface (to texture them seamesly) ?

[atyss]

Gofri,
Why not try to merge the surfaces, them to apply the trims?

The trick is to project the curves using a perspective as the Projection Method. This will create your trim based on the center to the object.
The only thing is that this projection creates a trim on the front and the back of your object. The good news are that you can then manually delete the unwanted trims.

If each contour point of the patches you are using for the pulpills fit perfectly on the contour points of the trim, you can use SCM to make them perfectly seamless.

To texture the head in this fasion, I would do my work in the bitmap file of the whole head, then to take out the eye's neighborhood and paste them in a separate map to apply on the pulpill patches. Applying an alpha channel on those small maps could help to get a good blending.

Good luck!
Bernard Lebel

[evatucek]

10x 4 reply, but i dont understand something, so i should ask again (sorry):
Is it possible to zip or merge surfaces using projected (or trim) curve?? as far as i know they use ONLY U or V curves of surfaces. Blend+ effect, i think, is the ONLY way to use projected (or trim) curve, but then i cannot use SCM and results with it are unsatisfactional.

[atyss]

Ok I get what you want. I made some little tests, and you are right.

-Sufaces can't be zipped using their trims, because those trims does not have control points. Zip uses the control points to snap them togheter.

-Surfaces can't be merged on their trims, because the merge can only occur on the opening of the object. Also, the merge must be aligned on the edge of Us or Vs.

What I would recommend is to keep the pulpills as seperate objects, and to make them a bit bigger. The extra pulpill sould enter into the head's geometry. Of course this would leave a seam, so if you're modeling a soft face it would not be adequate. Otherwise, like in the case of an old person, this could make a good fold under the pulpill.
The difficulty of texturing this varies upon the detail you want. Lots of fine details could hide the seam.

Finally, if the things I described does not fit your needs, the only thing I can recommend you is to take a look at this link:
http://www.webreference.com/3d/lesson39/
On it there is a tutorial on nurbs blending mehods.

Good luck!
Bernard Lebel

[evatucek]

10x again, Bernard !
I'll continue fighting