Modeling a Cage

cristiano.pasini · October 26, 2020, 10:41pm

Helo!

I have a question.
Is it possible to model a cage or control?

I need the control cage to have points only in the domain of the object.

I was able to use the surface as a control.

dale · October 27, 2020, 5:32pm

I am not sure I understand the question. Would you mind clarifying what you are trying to do and why? Can you do what you are asking with just Rhino?

– Dale

cristiano.pasini · October 27, 2020, 10:19pm

Hi Dale

I intend to manipulate the models in the same way that TSpline works.
I have molds of cast soles that I need to adapt to create other parts of the mold.
It is a consensus among mold designers that the use of the cage command is the most appropriate for this.
Is there any code in Python or C # to create a cage via code?

dale · October 28, 2020, 2:56am

Hi @cristiano.pasini,

I have not found any sample Python or C# code. But there is this C++ sample:

github.com

mcneel/rhino-developer-samples/blob/6/cpp/SampleCommands/cmdSampleCageEdit.cpp

#include "stdafx.h"

////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////
//
// BEGIN SampleCageEdit command
//

#pragma region SampleCageEdit command

class CCommandSampleCageEdit : public CRhinoCommand
{
public:
  CCommandSampleCageEdit() = default;
  ~CCommandSampleCageEdit() = default;
  UUID CommandUUID() override
  {
    // {9ACD7C05-7065-4EC8-88A3-F7A6D08C966A}
    static const GUID SampleCageEditCommand_UUID =
    { 0x9ACD7C05, 0x7065, 0x4EC8, { 0x88, 0xA3, 0xF7, 0xA6, 0xD0, 0x8C, 0x96, 0x6A } };

This file has been truncated. show original

Perhaps it can be ported to one of the above languages.

– Dale

cristiano.pasini · October 28, 2020, 3:50pm

Dale

I need to create a Control Morf, specific for each model. Another way I can do it is to edit an existing Control Morf. The problem is that it retains the deformation properties. How can I reset the transform matrix of this Control Morf?

dale · October 28, 2020, 10:09pm

You can always script either the Cage or the CageEdit commands.

A Cage, or morph control, does not maintain a transform. If you want your cage “reset”, then just delete it and make a new one.

– Dale

cristiano.pasini · October 28, 2020, 11:58pm

Is it possible to create a cage different from the traditional format (cube)?
Is the cage a mathematical representation? Like a 3D matrix?

cristiano.pasini · October 29, 2020, 12:13am

I would like to manipulate the model in the same way that TSpline works.

cristiano.pasini · October 29, 2020, 12:19am

Without subdividing surfaces

dale · October 29, 2020, 12:19am

@cristiano.pasini - Did you know that Rhino 7 includes SubD modeling?

– Dale