topic Re: Wire Parameters, Two different objects effects one object. in 3ds Max Forum

Wire Parameters, Two different objects effects one object.

sdeters — Mon, 26 Feb 2018 21:15:29 GMT

I have two different objects lets say LH and RH.

I have another object lets call it a teapot.

What I am trying to get to is, when I move a LH and/or RH object in the X direction, the teapot will rotate only 30 degrees .

If I move both LH and RH objects by 30 inches it will rotate Teapot by 30 degrees , if I only move the LH 30 inches, I still want the teapot to rotate 30 degrees. Also if I move the LH 15 and the RH 10 I would like the teapot rotate 15 degree, Or the largest of the two movements.

Wire parameters do not seem to work well here. Is there another way to tackle this small rigging puzzle?

Thanks

Re: Wire Parameters, Two different objects effects one object.

leeminardi — Tue, 27 Feb 2018 01:47:32 GMT

You can have logic statements in an Expression Controller or a Script Controller but neither will make a decision based on a delta move. Absolute positions or rotations can be used.

Is the rotation of teapot proportional to the position of LH and/or RH whichever is larger? If so something like this might work:

This will rotate teapot base on the Y coordinates of LH and RH. This may not be what you want to do but it may give you an idea of what is possible with an expression controller.

Re: Wire Parameters, Two different objects effects one object.

sdeters — Tue, 27 Feb 2018 13:38:59 GMT

Thanks for the feedback

what I am trying to show is how a differential works with miter gears.

I have the miter gears working well. I have the shafts spinning well.

Imagine applying the gas on the car one axle spins the other does nothing, or the car going around the a corner, one tire spins faster than the other but the pedal still only goes down half way.

I will review your solution. thanks

Re: Wire Parameters, Two different objects effects one object.

leeminardi — Tue, 27 Feb 2018 15:25:24 GMT

Here's an approach that might work for you. I do not have all the details worked out but I thought I'd share my thinking.

I made a quick crude model of a differential and added a checker pattern to help see the spinning of the "gears". The model uses the z value of a dummy to determine the ratio of the turning of the two gears connected to the wheels. If z = 1 the two gears spin at the same speed as well as the differential pinion. Set z = 2 for the dummy and one gear spins faster than the other. Try it out by rotating the driveshaft and seeing the action of the side gears for different values of z (but not z = 0). Some additional ratios have to be considered to make this fully functional.