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Marie-Helene Robert website |
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Size:
190 ko
Platform: Mac/PC |
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infos: |
| Model and Animate a Spring |
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How do I model and animate a spring? thread, EI-List Abstract: "There must be a way to animate a Spring with proper deformation!" The spring you see in the animation is a deformed Standard Shape2 cylinder. Get the EIAS project and take a look! The animated spring is modeled and animated in EIAS only, no external modeler needed, no morphs, no third party plugins either. Basic EIAS deform stuff ! Download the Quicktime movie (84Ko) |
It first inherits a Bend deformation (1440 degrees). At this point, the cylinder looks like a flat coil, a perfect circle. To make it spring to life, it also must inherit a Shear deformation... Here the shearing angle goes from 5 to 15 degrees and back. It is the shearing angle that uncoils the circle and makes it spring by putting some distance between the coils.
It is also interesting to note that the shearing angle is also what insures proper deformation of the spring in a still shape or during animation (no flattening of the cylinder bends and turns or flattening of the spring itself as it compresses up and down).
Thanks to Bob Wagner from the EI-List for introducing me to this particular use of the shear deform.
By the way, try it in your modeler too if it has deform tools: first shear your shape, then bend the sheared shape into a straight spring or a conic spring (a la Dairy Queen).
Enjoy !
Marie-Hélène
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