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Thursday, April 9, 2009
5:20 AM |
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The point of this tutorial is to create an object, like cylinder, with ability to change its length using bone. As you can see in video above, the black cylinder between two yellow mechanic hand can be stretched and squash as the mechanic hand moving wider or closer.
We need two bones applied to the cylinder, and apply IK Chain to those bones. Now create two null objects as a controller. Put one controller below the first mechanic hand, and onether controller below the second hand.
Next step is binding the bones to the cylinder, make sure the first bone applying to the all of top points and the second bone to all of the bottom side of the cylinder. Now choose the IK Expression in object manager, in Attributes Manager, tab 'Tag', you will find squash/Stretch option. Change the value to 100%. Now try to move the Bone Root and Joint Goal to test squash/strecth.
Then put the Bone root under the first controller and the Joint Goal under the second controller. Arrange the position of Bone Root and Joint Goal to the excact position of the controller, as you can see bellow. Now try to rotate the axis of the mecha hand.
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