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expressions and rigging

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I just started learning Houdini, currently following Adam Swabs jumpstart course.  He uses expressions for referencing different parts of a chair, in space and also in connection with the size changes. Besides the size automation, which I can see why it can be very powerful  tool, I was wondering, isn't this actually a rigging process, but instead of using "bones" he uses expressions? It seems a much slower process if someone is not interested in size changes(variations). Are there any benefits in using scripting instead of a simple rig?

After finishing the following through, I decided to do build his example on my own. I can make it look the same alright, but the expressions part, I am not sure , everything is as it should..


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typically you'd use bones for deformations but expressions at the SOP level are good for transforming geometry

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