On November 14, 2005 11:05 pm, Dave Culp wrote: > I want to animate an object, using the scale animation. Say I have a bit > of contrail which appears behind the user aircraft. I want that contrail > model to grow to about 2 or 3 times its starting size within 8 seconds. I > also want it to fade to transparent within 8 seconds, but that's another > issue. To do this I need a property that counts to 8 seconds. > > The only property I know of that does anything like this is > "sim/time/elapsed-sec", but its value will be unknown at the time the > contrail bit is created, so I can't use this raw value for the animation. > Let's say that when a particular bit of contrail is created the elapsed > time is 1528.35. If I could apply an offset of -1528.35 to this number, > then I would have the elapsed time since the model was created, and I could > use it for my animation because I'm now starting from a known value (zero). > > Dave
hmm... I'm not sure if there is any efficient way (if any at all) to do that. Have you considered using the <range></range> animation tags? It should give you the effect you want when the camera is following the plane. Ampere _______________________________________________ Flightgear-users mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
