Hinges in action

i have downloaded the trial version but can’t find the right way to get started with the Bongo functions.
Can anyone help me get this hinge moving?
bewegung scharnier.3dm (1.2 MB)

i think you are using rh5
I have done this in version 6, I don’t know if it will work for you

bewegung scharnier_Yo.3dm (1.3 MB)

I recommend that you start with these videos

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Dear Vikthor,
thank you very much for your prompt help… how did Bongo works in your Rhino 6 version?
My temporary test version only applies in version 5…
However, I saw those tutorials in You Tube but it makes me confused. The appearance is also different to my version here ;-(
On the other side it seems that self study helps for arround 60%…the details you should learn from professionals like you :wink:
Where did you learned it?
Regards Rainer

It works fine for now, since I haven’t done complex enough stuff.
if it was very disappointing when I went to save,
a warning came out saying that his file is version 5
However, I am sure that this video offers you all the clues to achieve your movement.

Vikthor, your solution is certainly original and inventive. But I’m sure using a Parent/Child link is far less cumbersome than the Simple constraints “ObjectToPivot” in your model, which bears a lot of auxiliary objects (points and lines).

This is obvious a challenge for IK.

But first some comment on Rainer’s design of the hinge.
In the coming next images and models the rivets are ‘hidden’ to bring out the essence more clearly.
In Rainer’s model the 2 perforations at the bottom left (in the right view) aren’t concentric.

Zoom in closely on the blue area to see. Because the difference is no longer there in Vikthor’s model (bewegung scharnier_Yo.3dm) I assume he fixed this? So I did likewise.

Although not being an engineer (so I can be mistaken) I think that the mechanism relies on a set of parallelograms as indicated in red on the image above. Unfortunately the center of none of the 2 perforations (in the blue area mentioned above) coincides with these parallelograms.
Consequently when you zoom in on Vikthor’s model at tick 99 you can see a minor shift in the coincidence of the perforations in the red circle.

So I took the liberty of moving the perforations to where I think they should be.

bewegung scharnier 001 IK.3dm (1.9 MB) is a IK solution for the mechanism. I write “a" solution because there are quite some variations to think of. This mechanism is obviously somewhat complex for a novice in Bongo.
The model is in Rhino 5, hence Rainer should be able to have a look anyhow. There is indeed a strong correspondence with the Siccorarm model in the video.

I am sure the “Connections” in Bongo 3 will mean a strong simplification of the assembly of mechanical structures. A firm basis is present in the current WIP.
bewegung scharnier 001 WIP.3dm (1.7 MB)
Unluckily for Rainer the WIP only runs on Rhino 6.0 and it is also just a little too early in development for me to start making tutorials.


PS Rainer: the trial version of Bongo 2 is also suited for Rhino 6.

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This is fantastic, it is much simpler to use Ik, so I avoid creating lines and points; i am very excited to try bongo for wip 7
I also modified the file again, leaving it in the initial position.
This time more orderly than before and practicing with the IKs that Luc mentioned. In addition to this I added the pins and each object was named according to my criteria to better understand.

test_Hinge_IK.3dm (1.5 MB) }}

Hi guys,
it is indeed difficult to follow you professionals.
I need a little more time or basic support.
regards rainer


It is quite impossible to explain the entire process to make a model of this sort step by step to a complete beginner in Bongo. First of all you have to understand the basic principles of Bongo like timeline, keyframes, pivot, animation-mode, etc…. Then there is the concept of Hierarchical linking and Forward Kinematics to grasp, before the step to Inverse Kinematic (IK for short) can be made.

I suggest you take a peek at some pages of the “Getting Stared” section at Bongo’s website http://bongo.rhino3d.com/page/getting-started

and a look at some tutorial videos:

After making some test models meanwhile you can probably come back with more targeted questions.


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Hi, @Luc
I have a question, which is very important for me to know :sweat_smile:
In the video scissor arm, between the min 2:00 to the min 2:20 , a chain of movements is displayed where the function of each restriction is seen. it would be really useful to add this function to bongo.
It is very explanatory when viewing these types of movements, it helps to better understand how the animation progresses.

An interesting thought.
Do you mean that at the moment when an object is made a IK joint, it would shortly wiggle in the appropriate way?

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Exactly as a preview