CGTalk - Mixing path constraint with attachment

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quantum_red

02-18-2003, 03:14 AM

I'd like to use a path constraint, but only constrain the Z axis. I want the x and y axis handled by a link to a parent object. Any way to constraints for only x y or z and not all? Or do I have to get into expression or script controllers to handle this?

phil

02-18-2003, 05:46 AM

if you only want to constrain a object to one axes then you will only be moving it in one direction anyway (ie. up and down). So why would you use a path to do this?

it's fairly simple to set up an expression contraint on a single axis so that it matches another object. is this what you want?

you just need to put position xyz controllers on the two objects then on the object you want constrained apply an expression controller to whatever axis you want. Inside the expression controller properties you make a new variable which you assign to the corresponding axis of your 'parent' object, then write this variable as the expression. if you want it to be offset then just add or minus the number of units that you want it offset by.

ie.
variable: parentPosX

expression: parentPosX + 50

cheers,
phil

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