Does anyone know how to turn radial motion (of a cylinder or sphere) into linear motion on one axis? I'm trying to get a rotating object to move another object horizontally only. Thanks in advance Mahray

You can track or parent an object from the linking menu in the attributes (click the object then click the "A" box that shows up. You can't get an object to push another. There is no physics/friction in Bryce. If you want to duplicate a wheel rolling on the ground etc. you just have to fake it. Remember Pi? Every time a 1-unit diameter wheel makes 1 revolution the circumference covers 3.14159... units. Figure out how many Bryce units across your cylinder is and move your other object Pi times that.

Like a screw gear? Not sure on this, I haven't really done any animation, but I think you'll have to do them separate. You know the starting position of each object, the ending position of the cycle, and how long it lasts. Agian, I'm not sure, there may be a way. If you create a dummy object in the middle of the cylinder, and rotate and translate it; parent one object to the dummy and set propigate for distance and/or offset (not sure which); then parent the other object to the dummy and set propigate for rotate; then set the dummy in its starting spot on frame one, and on frame whatever, put it in its ending spot. One object will move with the dummy, the other object will rotate with the dummy. I did just check that and it works, not sure if it makes sense but it works.

Thanks. It works, but it takes a bit more effort than doing it separately :)