Full Version: V5 Wish List

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Hi, I would have a request for the next version and it is the possibility of also being able to measure the radius of beziér or cubic curves, not generated by a circle, since the representation of the circles with nurbs is always an approximation, as can be done with other programs CAD where the detected dimension is dynamic and changes with curvature and also the detected center moves dynamically.

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Hi Metin,

re:
> I understand, although I hope the auto-complete feature will be added in the near future. :)
>
> An alternative might be a drag and drop option to easily add custom commands to the
> MoI UI, with automatic button and text label creation.

There is quite a lot of work involved in either of these so sorry don't expect it in the near future.

- Michael

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Hi pafurijaz,

re:
> Hi, I would have a request for the next version and it is the possibility of also being able
> to measure the radius of beziér or cubic curves, not generated by a circle, <...>

Moi's radius dimension is designed not to do that because it can be dangerous. It's too easy for someone to mistakenly think that a curve that looks similar to a circle is actually an exact circle and then put a dimension on it not knowing that the radius is not constant across the entire length of the curve.


> since the representation of the circles with nurbs is always an approximation

This is not correct, a NURBS curve can exactly represent a circle without approximation, that's why it has "weight" values as part of it's formulation. The weights (which give the "R" part of NURBS for "Rational") give NURBS curves the ability to exactly represent conic sections.


> as can be done with other programs CAD where the detected dimension is dynamic and changes with
> curvature and also the detected center moves dynamically.

Is there any CAD program other than Rhino that behaves that way? I just tested with ViaCAD for example and it does not put a radius dimension on a general spline curve.

I would think that's probably an unusual function specific to Rhino because normally a radial/diametric dimension should indicate an arc or circle curve and not a general spline curve that only happens to have the indicated value just at that point location.

- Michael

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About the approximation I have read this here on wikipedia. but maybe I've haven't read all the paragraph, only the first part. https://en.wikipedia.org/wiki/Non-uniform_rational_B-spline#Example:_a_circle.




About the program can do that, If I remember well Solidedge I'm sure NX and the others and can insert a dynamic radius on a curve and also FreeCad, and I'm pretty sure Autocad but I don't remember well if was it or an other at my previous job

These image attached is a SubD cylinder with imported in Moi and then exported in FreeCAD and I was warned about the curve isn't circle and the measure can be irregular







And this image is on FreeCad and show the curvature normal on B-spline and is possible to get the visualization of this on Moi3d maybe with a script?

Image Attachments:
B-spline-normal-curvature.png  E7OGWCfWUAA0ThW.png  E7OGWCkXMAYTdEo.png 

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Hi pafurijaz,

re:
> About the approximation I have read this here on wikipedia. but maybe I've haven't
> read all the paragraph, only the first part.

Right, it says this:

Non-rational splines, meaning a spline type without weight values in addition to x,y,z values for every control point, can only approximate a circle. That's why a NURBS curve is not a non-rational spline, the R in NURBS is for Rational.

As it says in the 2nd sentence, Rational splines (which includes NURBS) can represent circles exactly.

The Bezier curves in 2D illustration programs like Adobe Illustrator are non-rational cubics and can only approximate circles, unlike NURBS which can represent circles exactly.


re: AutoCAD radius dimension on spline
I don't have a running copy here at the moment but no I don't think that is correct:
https://forums.autodesk.com/t5/autocad-2000-2000i-2002-archive/radius-dimension-of-a-spline/td-p/1773056
https://www.cadforum.cz/en/how-to-dimension-radius-and-center-of-a-spline-in-a-given-point-tip12282


> And this image is on FreeCad and show the curvature normal on B-spline and is possible to
> get the visualization of this on Moi3d maybe with a script?

Sorry no MoI doesn't currently have a function for visualizing the curvature graph. It is possible for scripts to evaluate curvature properties of curves now so a script could be possible but I don't know if there is one.

- Michael

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Hi pafurijaz, here's a script that might help with putting radius dims onto non-circular curves. It generates a circle for the curvature at a point on a curve, so then you can probably use the circle to apply a dimension.

- Michael

Attachments:
CurvatureCircle.zip

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Awesome this script also give a lot of possibility thanks Michael.

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Hi pafurijaz, also here's another script, this one is a mash-up of creating a curvature circle at a point on a curve like the previous script, and then generating a radial dimension on the circle and then throwing the circle out leaving just the dimension.

Hopefully this one should be pretty close to what you were originally looking for.

- Michael

Attachments:
DimCurvature.zip

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Wow that's what I meant, this script works very well, you could integrate something like this as an alternative dimension in addition to the existing ones add this option as well. 
Fantastic. 
and too useful. 
Thank you very much.
Another question that came to my mind, the commands are many and the key combination is sometimes complex to set and limited, even if they are used combined with the function keys, CRTL. 
ALT and SHIFT.


With Autocad you can set an infinity of commands with combinations of strings or a single character and confirm with the space bar or enter, confirmation should be given after typing the abbreviated command, this way you can create shortcuts commands easier to type and remember, would that be something that can be evaluated in the next version?

here a pdf of command in autocad https://damassets.autodesk.net/content/dam/estore/customer-service/AutoCAD_Shortcuts_11x8.5_MECH-REV.pdf

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Hi pafurijaz,

re:
> With Autocad you can set an infinity of commands with combinations of strings or a single character
> and confirm with the space bar or enter, confirmation should be given after typing the abbreviated
> command, this way you can create shortcuts commands easier to type and remember, would that
> be something that can be evaluated in the next version?

Well that makes sense for AutoCAD because its program UI is based on a command-line type in interface.

So basically your request is asking whether MoI can completely alter its program UI to be based on a totally different concept, I'm sorry the answer is no that isn't something that I'm considering doing for the next version.

The command line based interface is not at all friendly for users without a lot of computer experience. One of the unique aspects of MoI is that it is approachable to people in this category and that's not something I want to lose.

If you want though, you can create your own command aliases pretty easily right now. If you want to make a command alias to have a command named "bd" that runs BooleanDifference, create a text file named bd.js and put it in your commands folder. Put this inside it:

moi.command.execCommand( 'BooleanDifference' );

You will now have a command named "bd" which when run will launch the BooleanDifference command. To use it type Tab, then bd and then Enter.

You can create any number of aliases right now using this method.

But one thing which is likely to happen in the nearer term for keyboard input is to extend the keyboard shortcuts to allow multiple separate keys in sequence like type b and then d, no tab or enter at the end.

- Michael

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Hi pafurijaz,

If the goal is to avoid having to remember and type script command names, you might find this little add-on helpful: https://moi3d.com/forum/messages.php?webtag=MOI&msg=10353.1

--Larry

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""""""""""> And this image is on FreeCad and show the curvature normal on B-spline and is possible to
> get the visualization of this on Moi3d maybe with a script?""""""""""

This "CCC" by Karsten Will give the graph.

http://moi3d.com/forum/lmessages.php?webtag=MOI&msg=6634.14

Then Max wrote a script that will give the "weighted point Data" for the curve being used

http://moi3d.com/forum/lmessages.php?webtag=MOI&msg=6257.18

A little further down in that last thread by max he made another command, with more options, which puts the points "On" the curve...

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This...



I suppose a guy could arc 3pt any of the curvature attachment points to get the radius there..... Or incorporate Michaels CurvatureCircle or DimCurvature Command too.

Image Attachments:
weighted curvature.jpg 

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Thanks to everyone for the support and the help, I will try these solutions, and also the method for the command shortcuts, even if it would not be bad to have the further possibility to enter the commands as indicated, I think that the two methods can coexist without problems , not creating any limitations for new users.

Edit:
i tried the advice to create the commands with the text file it works great for my use for now i will do so it seems like a good alternative, thanks

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I don’t know how to formulate this.
Maybe later I'll write a wishlist...

In the meantime, I wanted a little more integration of MOI3D for the requirements and needs of game development.
Various little things, I believe, that would make the work of those who work in MOI3D for games even more comfortable and faster.

I'm sure I'm not the only one here. ;))

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Hi krass, you'll need to be a lot more specific about what you're looking for.

- Michael

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An option to import Sketchup models in their native SKP format would be nice.

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Hi Kenmo, SKP files contain polygon mesh geometry. Like for example a model of a sphere in Sketchup is not made up of an exact sphere surface, instead it's a bunch of triangles.

Moi is not designed to do modeling work on that kind of data. MoI can generate that type of data out by dicing up large curved surfaces into little tiny facets but it is not easy to do the reverse and try to form large smooth surfaces out of a lot of little triangles.

So that's the reason why you can export to SKP out from MoI but not import it in and why it is not likely that there will be an SKP import function.

- Michael

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Thanks for the reply. I wasn't aware of the difficulty as Rhino3D and Form Z both import skp files (or at least they claim to as I do not have either app to claim otherwise).

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Hi Kenmo, both Rhino and FormZ are multi-purpose/"hybrid" type modeling apps which have support for modeling using either polygon mesh objects or NURBS objects. But these different object types have pretty distinct toolsets and so having this adds a considerable amount of complexity and weight to the program UI. They have a whole lot of different stuff all mashed together into one app.

One of the things that MoI is focused on is being streamlined with a lightweight easier to use UI. So MoI is not set up like that.

If working on imported SKP polygon data is an important function for you, then Rhino or FormZ could probably fit your needs better than MoI.

- Michael

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