Curvature graph on every control points row

I want to develop that roof surface nicely but the curvature graph does not relate to the control points rows, so the graph is averaged. I can`t see if every point is nice cause one point may be bad but on average, the graph will still look ok (which is dangerous in my opinion).

  1. is there any way to have a curvature graph on every control point’s row? If there is no such thing, then I would like to ask about adding that option (feature request).

  2. How to develop it now to see if any points are badly deflated? Do you have any tricks for that?

  1. If in Rhino8 then increase the ‘count’ value. If in any other version of Rhino then increase the isocurve density.

  2. Create a new display mode from the wireframe default setting but change the horizontal (or vertical scaling) to something like 0.05
    Use this exaggerated view to see if control points are wonky.
    Also use the ‘tilt view’ command to roll the view if necessary.

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@mdesign No averaging. The curvature graph is based on the curvature of the surface. The curvature at every location on the surface is influenced by mutiple control points. There is not a simple one-to-one relationship between curvature at a point and a single control point location. Instead the relative proportion of influence of the control points depends on the location on the surface.

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  1. Thanks. I haven`t seen that before. I have v8 license but I use v7 still more often.
  2. I`ve tried that but I see no effect in v7.

Strange, it should work.

Just as a double-check this is the exact workflow -

a) Rhino options/View/Display Modes - select wireframe then the copy button at bottom of window.
b) Select new display mode and rename to whatever you want.
c) Under the new display mode you’ve just created go to ‘Other settings’ and under view scaling set the horizontal scale to 0.05
d) Ok the the Rhino Options window to close it.
e) Go to an ortho view of the surface you want to analyse (front for example) then from the view drop-down menu select your new display mode.
f) You may have to Zoom Selected to re-centre the view.

If this doesn’t work then I have no idea I’m afraid!

One other useful trick for seeing out-of-alignment control points is switching your perspective view to ‘parallel’.

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I guess in this example you could simply increase the count of curvature graphs in the dialogue box until a graph aligns more or less the control point row.

Another solution would be to extract an iso curvve at the cp row (with history enabled) and then check the curvature of the parented iso curve while manipulating the control points of the surface.

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Is that possible to increase the count of curvature graphs on v7? I can see that feature only on v8. Thanks for that history-enabled trick.

Note this will not necessarily be identical to the surface graph.



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Yes, but in most cases it will give you a good idea what is happening curvature-wise

And people ask why I still use RH5/VSR lol

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Haha, I decided not to mention VSR and there comes @sgreenawalt to step in… :laughing:


How many years do I have to feel anger that I did not have the opportunity to buy VSR (I`ve started with Rhino 6)?

Why do we still haven`t copied all good practices from VSR to pure Rhino if almost every Rhino CAD modeler thinks the same about that? We all want the same. More VSR features in pure Rhino on the same level of ergonomics. Wrrrr :wink:

LOL you can always count on me to point out that a 10+ year old software running on 3 versions ago of Rhino absolutely runs circle around RH6/7/8.


It’s either you or me.
The day my computer will destroy my rhino 5 installation and I will not be able to re-authorize my shape modeling plug-in, will be a dark day…

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