How to extend NURBS curve ?
19482 19 4- live_fx
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- Mikael_Amion
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Perhaps its not what youre looking for but if you would do it manually you select the last or first point in the curveSOP and by shift+doubleclicking outside the curve re-enter the create state again and start adding points. Another way would be to add a new curve then merge it with the previous one and then use JoinSOP. Having persistent point display will also allow you to edit the joined curve as one without an additional edit SOP.
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- probbins
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- live_fx
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Probbins, thanks, but i`m sorry, i use wrong declaration above.
(my poor english.. )
When i say “tangential extended curves and surfaces”, i mean surfaces, or curves, created from other surfaces or curves, with tangential continuity…
I long times use Maya modeling tools, and now i use declarations from there. And (without “maya modeling”), tangential continuity and curvature continuity, is frequently used. Many kinds of fillets, many modeling tricks and workarounds can be created with it.
I think, this interesting task (but not needed for me right now). This will be interesting to solve this
(my poor english.. )
When i say “tangential extended curves and surfaces”, i mean surfaces, or curves, created from other surfaces or curves, with tangential continuity…
I long times use Maya modeling tools, and now i use declarations from there. And (without “maya modeling”), tangential continuity and curvature continuity, is frequently used. Many kinds of fillets, many modeling tricks and workarounds can be created with it.
I think, this interesting task (but not needed for me right now). This will be interesting to solve this
- old_school
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Now you tell us what you are up to!
Look at the Join, Stitch and Fillet SOPs.
They work with both curves, surfaces or both combined.
Joint simply takes two curves or surfaces and makes one surface. c0, c1 or c2 continuity is moot but you can introduce breakpoints at the seam.
Stitch is what you are looking to if you want to get c0, c1 or c2 continuity between two curves, two surfaces or curves to surfaces. What's neat about this sop is that you can get tangential but not c0 or position continuity. Just enable the various toggles for position, tangential and curvature continuity.
Fillet introduces a third curve or surface between curves or surfaces.
There are other NURBs tools available. They are also mis-targeted. They really should have been called parametric tools… First, all these tools if they work on open or closed profiles (curves), then you can work on Polys, Bezier and NURBs curves. Parametric surfaces in Houdini are polygon Meshes, Bezier and NURBs patches.
You can also use the grid quite creatively to align to two or three points to create flat planes tangential to parts of surfaces to move CV's along.
-jeff
Look at the Join, Stitch and Fillet SOPs.
They work with both curves, surfaces or both combined.
Joint simply takes two curves or surfaces and makes one surface. c0, c1 or c2 continuity is moot but you can introduce breakpoints at the seam.
Stitch is what you are looking to if you want to get c0, c1 or c2 continuity between two curves, two surfaces or curves to surfaces. What's neat about this sop is that you can get tangential but not c0 or position continuity. Just enable the various toggles for position, tangential and curvature continuity.
Fillet introduces a third curve or surface between curves or surfaces.
There are other NURBs tools available. They are also mis-targeted. They really should have been called parametric tools… First, all these tools if they work on open or closed profiles (curves), then you can work on Polys, Bezier and NURBs curves. Parametric surfaces in Houdini are polygon Meshes, Bezier and NURBs patches.
You can also use the grid quite creatively to align to two or three points to create flat planes tangential to parts of surfaces to move CV's along.
-jeff
There's at least one school like the old school!
- digitallysane
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- live_fx
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Thanks for advance in SOP-s, Jeff, this need, because i`m not understand sometimes, how Houdini NURBS work.
~~~
and i don`t understand why i din`t see this two last posts. I don`t see any email notifications from forum about this posts:
by Jeff - “Posted: Thu Jun 26, 2008 12:50 pm ”
by digitallysane - “Posted: Thu Jun 26, 2008 1:09 pm”
~~~
and i don`t understand why i din`t see this two last posts. I don`t see any email notifications from forum about this posts:
by Jeff - “Posted: Thu Jun 26, 2008 12:50 pm ”
by digitallysane - “Posted: Thu Jun 26, 2008 1:09 pm”
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- jespizua
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Hello,
I'm trying to learn NURBS inside Houdini, but I do not understand a few basics things. What I'm trying to make is a simple rounded box from a box NURBS, but I can't manage to solve how the fillet SOP works.
The steeps I've follow are:
1_ Create a Box and change primitive type to NURBS
2_ Inside boxObject I've attached a Fillet SOP
I don't know if that is the workflow to build that object. Bellow I've attached a screen capture of the result.
Thanks in advance,
José
I'm trying to learn NURBS inside Houdini, but I do not understand a few basics things. What I'm trying to make is a simple rounded box from a box NURBS, but I can't manage to solve how the fillet SOP works.
The steeps I've follow are:
1_ Create a Box and change primitive type to NURBS
2_ Inside boxObject I've attached a Fillet SOP
I don't know if that is the workflow to build that object. Bellow I've attached a screen capture of the result.
Thanks in advance,
José
- digitallysane
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In Houdini, Fillet is used to generate a surface with tangency between the edges of 2 other surfaces. It doesn't generate trims nor does it creates surface between trims (you can use Bridge SOP for that).
It can also generate connecting curves between the ends of 2 curves (NURBS, Bezier or polygons).
The tool for your need is the Round SOP, it creates the rounding surfaces and also generates the trims.
Surfsect SOP is also useful for NURBS booleans.
Dragos
It can also generate connecting curves between the ends of 2 curves (NURBS, Bezier or polygons).
The tool for your need is the Round SOP, it creates the rounding surfaces and also generates the trims.
Surfsect SOP is also useful for NURBS booleans.
Dragos
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