Where can I find this command?
Troubleshoot shelling
Permalink Reply by Arthur Mamou-Mani on May 19, 2010 at 8:21am Permalink Reply by Timothée Raison on May 19, 2010 at 12:59pm Permalink Reply by Timothée Raison on May 19, 2010 at 6:13pm Attachments: Permalink Reply by Gwyll on May 19, 2010 at 9:31pm Permalink Reply by Timothée Raison on May 21, 2010 at 5:29pm Permalink Reply by Gwyll on May 21, 2010 at 10:09pm ![Offsetsrf Failure On Complex Polysurface Offsetsrf Failure On Complex Polysurface](https://api.ning.com/files/*12Qsiit6*sm6kPIdSDwMqLdh5-XxBwugIe29f8IQNPtKWns-vLhYkgkTODzVMXpzIjhYujxIb-C*NBURlnSbh-0iF5-QFgT/ScreenShot.JPG?width=721)
Permalink Reply by Adam Fenton on September 25, 2011 at 5:54am
Toolbars
Menus
Solid
Offset
Surface
Let Γn be a polysurface group of length n. It is commensurable with a fundamental group of a 2n-manifold X(Γn) which is considered as an n-step iterated surface-fibration. Mar 19, 2018 It doesn’t make sense to me that the polysurface wouldn’t be able to split it. Ultimately, I want to break the object into two halves along edges from the voronoi diagram. EDIT: I am getting the same problem when I went back in to the original form and tried to use an extruded isocurve on both sides to split the geometry. Without getting very technical, non-manifold geometry is a geometry that cannot exist in the real world. Meaning that a 3D model can be represented digitally, but there is no geometry in the real world that could physically support it.Since the mesh of the 3D model is. Note: Offset a surface (command: offsetsrf): Creates a new surface at a specified distance from the original. Can be used to create a solid surface by selecting the Solid option. It only operates on solid, manifold polysurfaces. Selected polysurface faces are removed, the remaining faces are offset inward, and the inner and outer parts are joined. OffsetSrf - works on polysurfaces and solids. Options for round or sharp corners.
Offset Surface
The OffsetSrf command copies a surface or polysurface so that locations on the copied surface are the same specified distance from the original surface.
Steps
1. | Select a surface or polysurface. |
2. | Type the offset distance, and press Enter. |
Options
Distance
Specifies a distance for the offset.
Corner
Round
Creates a fillet at sharp corners in the original surface.
Sharp
Maintains the sharp corner when the original surface has a sharp corner.
FlipAll
Flips the offset direction of all selected surfaces. Arrows indicate the positive offset direction.
Solid
Makes a closed solid from the input and offset surfaces by lofting a ruled surface between all of the matching edges.
Loose (Surfaces only)
The resulting surface point structure is identical to the original surface.
Tolerance
Sets the tolerance for the offset surface. Type 0 to use the default tolerance.
BothSides Toukiden kiwami psp iso.
Draws the offset on both sides of the original.
DeleteInput
Yes
Deletes the original geometry.
No
Retains the original geometry.
Note
● | Positive values offset in the direction the arrows. Negative values offset the other way. |
● | When a plane, torus, sphere, open cylinder, or open cone surface is offset, the resulting surface is exact. Free-form surfaces are offset to within the value of the Tolerance option. |
● | When offsetting surfaces are joined that are part of a polysurface, there is no guarantee that the offset surfaces will also join into another polysurface. For example, offsetting the six sides of a box will not result in a larger closed box. It will return six separate surfaces with gaps between the edges. |
● | The OffsetSrf command does not maintain the overall structure of the starting polysurface in the offsets. Each surface offsets as an individual object. |
Shell and OffsetSrf for polysurfaces are works in progress. There are several known problem areas:
● | Singular surfaces can cause problems, especially when the offset of the surface must be extended at the singularity. The extensions are done in OffsetSrf (Corner=Sharp) and shelling, which always uses sharp corners. These extensions happen when the offsets of adjacent surfaces come apart. Also, cone-like singularities cause problems in all cases. |
● | Complex vertices (ones with more than three edges) can be problematic, especially in shelling and sharp corner offsets and where some, but not all, of the surfaces at the vertex offset apart. |
● | OffsetSrf on polysurfaces with naked edges, where the naked edges make concave boundaries will not work correctly. |
● | If faces adjacent to the removed faces offset in such a way that the removed face must be extended to fill in the gap, it will fail. |
● | Any surface whose offset self-intersects will cause a problem. |
See also
Rhinoceros 5 © 2010-2015 Robert McNeel & Associates. 17-Sep-2015
Salut Timothée !
Have look at the previous conversation (giulio's definition):
http://www.grasshopper3d.com/forum/topics/mapping-a-rectangular-grid
you can use it to populate components on a polysurface (using the four corners of the grid for each surface).
Have look at the previous conversation (giulio's definition):
http://www.grasshopper3d.com/forum/topics/mapping-a-rectangular-grid
you can use it to populate components on a polysurface (using the four corners of the grid for each surface).
Hi Arthur, thanks for the answer.
I'm not sure if it fits to my project.. I'm concerned with surfaces with both conditions: curved parts and sharp edges (as you can achieve lofting one degree curves). I join a picture, it might be easier to see what I mean.
The solution you offered me is leading to a faceted polygonal surface, right? or maybe it's that I don't get how to relate this definition to the morph tool? I would like to morph the components according to the curvature of the surface. In addition to this, the UV divisions are linked and I couldn't find a way to control them separately (when I do it, the resulting mesh gets crazy!!).
thanks for the help.
timothée
I'm not sure if it fits to my project.. I'm concerned with surfaces with both conditions: curved parts and sharp edges (as you can achieve lofting one degree curves). I join a picture, it might be easier to see what I mean.
The solution you offered me is leading to a faceted polygonal surface, right? or maybe it's that I don't get how to relate this definition to the morph tool? I would like to morph the components according to the curvature of the surface. In addition to this, the UV divisions are linked and I couldn't find a way to control them separately (when I do it, the resulting mesh gets crazy!!).
thanks for the help.
timothée
here comes the picture. seem like something was wrong with the previous post..
- curvedSurf_sharpEdges.jpg, 223 KB
If you just want to populate the polysurface with components that are oriented according to the curvature of the surface you can contour your polysurface and use the generated points to map components to. This gives you an even grid with each point responding to its respective surface topology. You wont be able to use this grid to form components with shared edges though - as it gets difficult to bridge individual surface gaps. To do that I would suggest maybe meshing your surface into reasonably uniform quads, offsetting those and embedding your components between. This will simplify your surface in a fairly violent fashion though.
As usual, Ive got an explanation of the polysurface grid definition on my blog: http://ledatomica.wordpress.com/2010/03/28/grids-on-polysurfaces/
As usual, Ive got an explanation of the polysurface grid definition on my blog: http://ledatomica.wordpress.com/2010/03/28/grids-on-polysurfaces/
Hi Gwyllim and thanks for your help!
the solution on your blog is interesting (actually I have to say that I found very interesting stuff all over you blog as well!!!)
I was trying to rebuild the definition but I miss two components, in the second part (the second pic). I don't know what are the two components before 'eval'(the last one)? one is polySrfGrid, but I can't find it anywhere and the one before is a kind of slider I have never seen yet (sorry for those very basic questions but I'm still very new to GH).
thanks.
timothée
the solution on your blog is interesting (actually I have to say that I found very interesting stuff all over you blog as well!!!)
I was trying to rebuild the definition but I miss two components, in the second part (the second pic). I don't know what are the two components before 'eval'(the last one)? one is polySrfGrid, but I can't find it anywhere and the one before is a kind of slider I have never seen yet (sorry for those very basic questions but I'm still very new to GH).
thanks.
timothée
Offsetsrf Failure On Complex Polysurface Work
The PolySrfGrid was a label that I made for Surface closest point component - it does make for a confusing 'tutorial' and I'd be surprised if people can easily reproduce the definition. The strange slider I think is a path mapper component - In this definition it lets me 'flatten' certain parts of the tree structure.
Ive uploaded the definition for you to check against your own, or you can just use it instead. Its at the bottom of the blog post.
Thanks for checking out my stuff.
Ive uploaded the definition for you to check against your own, or you can just use it instead. Its at the bottom of the blog post.
Thanks for checking out my stuff.
Offsetsrf Failure On Complex Polysurface Meaning
this is a great definition but does not seem to be working for me. The section component does not work. Is there any chance you could maybe sent the rhino file and gh file to my email to see how it works? Thanks
[email protected]
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