[Dan Ebberts]

Did you try Layer>Transform>Auto Orient>Orient Towards Camera?

Dan

[Dan Ebberts]

If you just want to randomly position them, a position expression like this should do it:

minXYZ = [0,0,0];
maxXYZ = [thisComp.width,thisComp.height,1000];
seedRandom(index,true);
random(minXYZ,maxXYZ);

Adjust the min and max x, y, and z values in the first two parameters to set the bounds.

Dan

[Dan Ebberts]

If you just want to randomly position them, a position expression like this should do it:

minXYZ = [0,0,0];
maxXYZ = [thisComp.width,thisComp.height,1000];
seedRandom(index,true);
random(minXYZ,maxXYZ);

Adjust the min and max x, y, and z values in the first two parameters to set the bounds.

Dan

[Dan Ebberts]

Yes, this would be for position property of a 3D layer. The bounce will be in the z direction. If you wanted it to bounce a 2D layer in the y direction, you would just change this:

value+[0,0,y];

to thie:

value+[0,y];

Hope that helps.

Dan

[Dan Ebberts]

Yes, this would be for position property of a 3D layer. The bounce will be in the z direction. If you wanted it to bounce a 2D layer in the y direction, you would just change this:

value+[0,0,y];

to thie:

value+[0,y];

Hope that helps.

Dan

[Dan Ebberts]

>would this expression sum up all the rotations

It seems to. Except possibly in a gimbal lock situation.

>if so: brilliant stuff

Thanks! 🙂

>do you think it is feasible in Javascript to convert an After Effects style 3D Euler rotation to a VRML-style axis+angle rotation ?

I’m not that familiar with VRML, but it seems like it should just be a matter of cooking up the right transform.

Dan

[Dan Ebberts]

>would this expression sum up all the rotations

It seems to. Except possibly in a gimbal lock situation.

>if so: brilliant stuff

Thanks! 🙂

>do you think it is feasible in Javascript to convert an After Effects style 3D Euler rotation to a VRML-style axis+angle rotation ?

I’m not that familiar with VRML, but it seems like it should just be a matter of cooking up the right transform.

Dan

[Dan Ebberts]

Try this:

n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
n–;
}
}
if (n == 0){
value
}else{
t = time – key(n).time;
veloc = 18;
amplitude = 60;
decay = 6;
y = amplitude*Math.cos(veloc*t)/Math.exp(decay*t);
value+[0,0,y];
}

Dan

[Dan Ebberts]

Try this:

n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
n–;
}
}
if (n == 0){
value
}else{
t = time – key(n).time;
veloc = 18;
amplitude = 60;
decay = 6;
y = amplitude*Math.cos(veloc*t)/Math.exp(decay*t);
value+[0,0,y];
}

Dan

[Dan Ebberts]

It would indeed be extremely useful if you could force random() to produce the same random sequence in different layers and properties. I think seedRandom needs a third parameter – global = true, but alas, as you discovered, it doesn’t exist.

Dan