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New User -- Rig Question --- Why is whole object moving, not just the target ?

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mikespitzer:
Hello gang

New member here .

Been reading Ian Ross's book and the PDF manuals and practicing tutorials before asking this question
But I am stumped.

I have a Dinosaur with the early beginning stages of Rigging and Skinning with Bone Influencing --- starting with legs

When I test the motion by bending joints, the RIGHT side of the body works properly at each joint (hip, knee, ankle)

But when trying to rotate the same bones on LEFT side of the body, the ankle works properly
BUT ... the entire object (Dinosaur figure) rotates when testing the hip and knee rotations

I thought both sides were created the same way .... so not sure why left side and right side are behaving differently

I have looked at my bone settings, skinning, influencing - but I must be missing some setting or detail that has the LEFT side of body effectively "fused together, -- but the RIGHT side working as intended (so far )

I have attached the ANI file to see if somebody can spot the error

Thanks

ianross:
Hi Mike, firstly well done on your T-Rex model bone influence, it is a very good first attempt.
The problem being you have not added any bones to the upper body/ head and tail.
May I suggest you start again but this time add bones to the head main torso and tail, rather than use influence please use weight painting see page 169.
Please review my T Rex with weight painting in the picture 2.
Any problems please get back to me.
Good luck 8)

mikespitzer:
Ian Ross

Thank you, I will try that.

But just so I understand what the software is doing better.....although  head and torso skeleton is not yet added....what is wrong with the existing  bones that cause all the joints to bend proper on right leg....but the hip and thigh on left leg is not flexing mesh but is instead rotating the whole figure like it is a central root bone?
Thanks

ianross:
Mike you need to add more bones and use weight painting, this will help resolve your problem regarding the unwanted rotating movements.
You are making good progress, keep going.

mikespitzer:
Ian,

So to be sure I understand --- what is happening here is without the other bones in the body and skinning / weighting regions defined, something about the shape of the object is confusing the software on the left side when it "grabs the mesh" and rotates?

Your advice would indicate a full skeleton must be built before beginning any skinning

My idea of "testing each small section" as I went along may be fine in theory....but does not work in real practice

Thanks for your help --- hope the questions don't seem odd -- but I like to understand both the HOW and the WHY of things work.

Side Note -- at my age (59) , I have no plans to become a 3D animation expert and get a job in Hollywood making modern movies (smile)
Though that would be appealing if I was just now 16 or so -- starting out in life.

My interest in reading your book .. and a textbook on 3D animation production .... was simply to get a basic knowledge of how the process works from a blank computer screen --- thru live footage and green screening ---- to chrome key and composites to a final "Jurassic Park" style movie blending real and animation together on the screen.
And thus have a better appreciation of the process.

I figure my "goal" will be to make a short 1-2 minute movie of something like me facing a dinosaur in a wooded area, then run towards the camera with the dinosaur chasing


Or something like that which would pretty much incorporate all the steps from

Modeling - texturing --rigging -- animation sequence -- chrome key -- live footage -- lighting - rendering ---etc...

Perhaps basic and simplistic --- but at least then I will have a better understanding of the whole process when I am watching a big budget movie

Thanks again

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