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From: Michael Gibson
Hi Bravlin, same thing - NURBS models are not generally editable in all areas by control point editing, because of the "underlying surface" and "trim curve" concepts that we talked about previously. That's where after a boolean operation between 2 objects, the surface geometry does not change and only new trim curves are created. That means that you have 2 surfaces that have different control point structures that kind of pass through each other and don't share a common set of control points along their topological joined edge unlike with polygon modeling.
Since NURBS solids are not generally editable by control point manipulation it follows that editing surfaces by control point manipulation is not a focus for CAD programs.
A CAD program is not the right kind of tool for that kind of modeling strategy, there are other tools that do focus on it and do a better job than what a CAD program could do.
CAD programs are strong in different areas like being able to form models from a small number of 2D profile curves using boolean operations.
- Michael
From: Bravlin
I don't looking for "sculpting in Moi3D". I already understand that this program have its specialty.
But so far, i often move points on surfaces, use Flow deformer etc. And i feel lack of falloff feature in such operations.
With falloff i can move one control point and affect all nearby points a little.
And without it, i get the same result but in a sequence of mostly the same movement operations.
I do not ask about universal falloff feature that would deform two different surfaces that share one "trim curve" flawlessly (by the way it would be interesting to see how Flow deformer works).
I also understand that surface that looks like one object may consist of two and more invisible surfaces with different geometry and density trimmed and limited by "trim curves".
But still we can move control points on such surfaces one by one and result looks good and trim curves describe surface right.
Yes if we have only few points on a surface and move one of them too much we would affect all other points and our surface would not connect to its neighbors right any more.
But we can move neighbor surfaces later. And if we have heavy surface its a hell to move control points one by one. We also can move lots of points on heavy surfaces and do not affect connection line (or trim line of this surface).
From: Michael Gibson
Hi Bravlin, someday perhaps I'll be able to focus on more surface control point editing functionality. It hasn't been a focus area so far because of its limited use in CAD object structure as I described and because there are many polygon modeling programs that already focus very much on that type of modeling.
I recommend using a polygon modeling program if you want to do that style of modeling though, not MoI. It is not currently a very developed or targeted area in MoI.
- Michael
From: Frenchy Pilou (PILOU)
You can make that in Moi ! ; (before maybe some deformations's cage or other marvelous things! ;)
But all surfaces must be Separated : moving tweaking points can be on several surfaces on the same time!
So for a cube don't move it's edges if you want keep it as a solid when you Join surfaces at the end of tweaking!
From: nameless
Thanks Pilou for opening my eyes to this! Separating to surfaces and then playing with points that belong to different surface and then joining can be a great way to deform a solid in a very controlled way.
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