Tentacle Arm Rig

Issues concerning rigging & Face Robot...
DerSchlex
Posts: 4
Joined: 23 Nov 2010, 16:10

Tentacle Arm Rig

Post by DerSchlex » 03 May 2018, 12:35

Hi folks,

I would be very glad to find some help here.
What I have to animate is a tentacle squid arm, that makes a special roundish gesture on the end of the tip to grab something. Inside the arm are many vertebras close to each other.

To control the arm I think bones with FK could be the way. I tried a setup with few bones. To get a smooth control object for the vertebras and the envelop I tried a control spline constrained to the bones. Now I have something to attach the smoother envelop to. But: As to be seen in picture C the mesh ist twisting. Ahhh.

Is there a better way to get a well controlable sguid arm (picture A) with many smooth substeps for vertebras ans envelope?

greetings,
Schlex

Image

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mattmos
Posts: 422
Joined: 02 Dec 2009, 16:59

Re: Tentacle Arm Rig

Post by mattmos » 03 May 2018, 13:54

Instead of using a control spine you could use a enveloped nurbs strip with nulls constrained along the length, orientated to normals, as it provides solid control over the twisting.

DerSchlex
Posts: 4
Joined: 23 Nov 2010, 16:10

Re: Tentacle Arm Rig

Post by DerSchlex » 03 May 2018, 14:12

Hi. Thank you. This sounds good. Could you explain more in detail please? I am not that firm with nurbs.

DerSchlex
Posts: 4
Joined: 23 Nov 2010, 16:10

Re: Tentacle Arm Rig

Post by DerSchlex » 03 May 2018, 15:41

Now I got it. It works. Thank you for thinking around the corner.)

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mattmos
Posts: 422
Joined: 02 Dec 2009, 16:59

Re: Tentacle Arm Rig

Post by mattmos » 03 May 2018, 22:34

Sorry, didn't get any email notifications of replies, and was slammed today - glad you got it working!

DerSchlex
Posts: 4
Joined: 23 Nov 2010, 16:10

Re: Tentacle Arm Rig

Post by DerSchlex » 04 May 2018, 09:55

Glad you helped me. It is working really fine.

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Draise
Posts: 813
Joined: 09 Oct 2012, 20:48
Skype: ondraise
Location: Colombia

Re: Tentacle Arm Rig

Post by Draise » 04 May 2018, 15:40

A nurb strip! Genious, I would have never thought.

The alternative is creating a number of upvectors for your chains (so that you could potentially also have IK tentacles) and still have rotational control (and less flipping)