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TUT - Jack the Piston
This is one of these tricks that make animations of pistons easy. No xpresso, no math, nothing complicated.
Follow up:
To create a working piston, start by making 2 null objects, put one as a child of the "foot" in the bottom position of the piston and the other as a child of the "arm" object at the top position of the piston.
Add a target expression(tag) to both nulls and target them to the opposite null. That is it.
Now you can add cylinders and other objects to each null to create the actual piston.
Permalink9 comments
Comment from: Adil Muneer [Visitor] : 2008-08-22 @ 21:05
you have given a very rough glance about this tutorial. this dose not seems complete. please think about the beginners.
Comment from: base80 [Member] 
: 2008-08-22 @ 21:08
: 2008-08-22 @ 21:08
This actually is for beginners. Two nulls and two Target Tags, Duh it doesn't come more easily than that sorry.
Comment from: macling [Visitor] : 2008-09-18 @ 11:41
Works great here...love your minimal solutions!
Comment from: base80 [Member] : 2008-09-19 @ 02:21
: 2008-09-19 @ 02:21
Here is a file, as requested by some...
http://www.base80.com/xpresso-files/piston/piston_tut.c4d.zip
http://www.base80.com/xpresso-files/piston/piston_tut.c4d.zip
Comment from: Karmanda [Visitor] : 2008-09-19 @ 07:35
: 2008-09-19 @ 07:35
Thank you so much, now that I see the layout I can get it working & understand it. Much appreciated.
Comment from: Spike [Visitor] · http://artvod.co.uk : 2009-03-09 @ 20:36
That is genius. i spent hours with Xpresso trying to figure that out. genius.
Comment from: nabola [Visitor] : 2011-02-09 @ 09:10
for us who are expert in graghisme is a bit difficult to understand. I would like you to explain in more detail this tutorial. Thank you ..
Comment from: Peter [Visitor] : 2011-05-02 @ 08:45
In this example you use a target tag. Do you have examples using the constraints tags?
P.
Rotjeknor
P.
Rotjeknor
Comment from: Fluffy [Visitor] : 2011-08-25 @ 02:16
Just use the Aim constraint for each Null object, and target the opposite Null on each tag.
For example, the Aim constraint of Null1 will target Null2, and vice-versa.
For example, the Aim constraint of Null1 will target Null2, and vice-versa.