You don't need more objects, you need more parameters. If you create an 'offset' parameter for each of the custom parameters you already have, you can add them into your expression to give you the control you want without having to resort to additional objects and constraints.
Basically, you're making the expression a little more complex to save from adding unnecessary stuff to the scene. Matt From: [email protected] [mailto:[email protected]] On Behalf Of Byron Nash Sent: Monday, November 19, 2012 10:51 AM To: [email protected] Subject: Re: Expression Question OK, good to know. I was trying to apply how expressions work in After Effects I guess. I'll break it out into more objects. On Mon, Nov 19, 2012 at 1:37 PM, Peter Agg <[email protected]<mailto:[email protected]>> wrote: Yeah, the usual way around it is to have 2 different objects with 2 different drivers/operators, then you can blend a constraint between the two of them via a custom parameter. On 19 November 2012 18:34, Matt Lind <[email protected]<mailto:[email protected]>> wrote: An Expression is an operator in Softimage. When an operator's output ports drive a parameter, the parameter is under full control of the operator. As long as the parameter is driven by the operator, the only control you have is the parameter value via the operator's output. The only way to regain manual control of the parameter is to mute or delete the operator. Matt From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Byron Nash Sent: Monday, November 19, 2012 10:28 AM To: [email protected]<mailto:[email protected]> Subject: Expression Question I have a simple expression question. I have some custom parameters driving the animation of other objects. I would like to have a check box that should link one parameter to the other. It sort of works but the value does not change when I disable the check box. Here is my expression. cond( AWD_Mower.Mower_Controls.Lock_Wheel_Height == 1, AWD_Mower.Mower_Controls.Front_Wheel_Height, AWD_Mower.Mower_Controls.Rear_Wheel_Height ) In case it's not obvious from the expression, I have two sliders, "Front_Wheel_Height", and "Rear_Wheel_Height". And a checkbox called "Lock_Wheel_Height". According to my expression, shouldn't the "Rear_Wheel_Height" slider be adjustable when the check box is off? I have the expression on the "Rear_Wheel_Height". When I disable the check box, the slider jumps to a fixed value and will not change. When I enable it, it follows the first slider as expected. Thanks, Byron
