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Blender 2.49 Scripting by Michel J. Anders

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Chapter 4. Pydrivers and Constraints

When designing a complex object with movable parts we'd like to control how these parts move in relation to each other. Sometimes, we might want to try and simulate reality by using a physics engine such as bullet, but often this is either not accurate enough or does not provide an animator with enough control. Most of the time the clever use of multiple constraints will achieve our goals, but sometimes the restrictions and relations cannot be expressed in terms of simple constraints and key-framed motions. In those cases, we can extend Blender's capabilities by defining our own constraints or relations between animated properties by using Python.

In this chapter, we will see how we can associate built-in constraints ...

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