Expressions/Scripts/Presets

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malex
Topic Author
Posts: 20
Joined: Fri May 21, 2004 3:03 pm

Animate your paint strokes

Thu Jun 03, 2004 11:24 am

This expression was created by Dan Ebberts NOTE : It will only work in AE 6.5

Here's a fun example.

Create a 200 x 200 layer and draw a generally vertical stroke (start at the bottom and draw up) that extends about half the height of the comp. Set "Paint on Transparent" to on. Apply this expression to the brush's position transform:

range = [50,50];
center = [width/2,height/2];

random(center - range, center + range);



Apply this expression to the brush's rotation transform:

p = propertyGroup(1).position;
center = [width/2,height/2];

if (p[0] < center[0]){
if (p[1] < center[1]){
random(90,180)
}else{
random(0,90)
}
}else if (p[1] < center[1]){
random(180,270)
}else{
random(270,360)
}


Duplicate the brush a bunch of times and preview.
 
r.t-rone
Posts: 4
Joined: Tue Apr 17, 2007 8:18 am
Location: Tuscaloosa, AL

Tue May 08, 2007 8:53 am

I tried to follow this example, but when I put in the expression for the brush's rotation transform a dialouge box popped up that read "Bad method arguments: propertyGroup can't be used on this Property". What am I doing wrong? I just copied and pasted the expression from the webpage. I also made sure that I was using 6.5.

Thanks for your help.
 
Dan Ebberts
Posts: 318
Joined: Sat Jun 26, 2004 10:01 am
Location: Folsom, CA
Contact:

Tue May 08, 2007 9:07 am

You would get that result if you pasted the expression into the layer's rotation property rather than the brush's. Is that possibly what happened?

Dan
 
r.t-rone
Posts: 4
Joined: Tue Apr 17, 2007 8:18 am
Location: Tuscaloosa, AL

Tue May 08, 2007 9:24 am

I'm a little confused. I am sort of new at using After Effects. Okay, after I draw the spline do I apply a stroke effect to it? I thought that that was what I was supposed to do, but I did not see brush position or rotation under this effect's options. I did end up applying these expressions to the layer properties.

I guess I am a little confused what effect I am supposed to apply to the spline to see these options.

Thanks for your help.
 
Dan Ebberts
Posts: 318
Joined: Sat Jun 26, 2004 10:01 am
Location: Folsom, CA
Contact:

Tue May 08, 2007 9:44 am

I cooked this up specifically for Paint effect strokes. I don't think it will work with stroked paths.

Dan
 
r.t-rone
Posts: 4
Joined: Tue Apr 17, 2007 8:18 am
Location: Tuscaloosa, AL

Re: Animate your paint strokes

Tue May 15, 2007 9:53 am

[quote="malex"]draw a generally vertical stroke (start at the bottom and draw up) that extends about half the height of the comp. quote]

I know what I was doing wrong. I was using the pen tool to draw the stroke instead of the brush tool. That's why I did not see the brush options in the paint effect. I feel like such a jerk!

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