Making Light Disappear & Reappear Behind Objects Using Expressions


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Making Light Disappear & Reappear Behind Objects Using Expressions
by JustinG1983 on Sep 24, 2007 at 2:22:51 pm

This is the expression I have on the flare brightness.

target = thisComp.layer("cloudswithalpha");
x = target.sampleImage(thisComp.layer("Null 1").transform.position, [3.5,3.5], true, time);
alpha = x[3] * 100;
linear(alpha, 0, 36, 80, 20)

Layers-
Comps- cloudsprecomp,cloudswithflare
Solids-cloudswithalpha,lensflare,Null 1, sky

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Re: Making Light Disappear & Reappear Behind Objects Using Expressions
by pxlguy on Sep 24, 2007 at 2:36:42 pm

YOUR ORIGINAL COMMENT WAS:
I have a quick question about this tutorial. When I set the code in on the flare brightness it says an error occurs on line 2. The error reads class ' layer' has no property or method named 'sky'.
Error occurred at line 2.
Expression disabled.
If you could help me out I would appreciate it.
-----------------------------------------------

Justin,
I copied your expression into my project and except for adjusting the name of the layer "Clouds with Alpha", it worked fine. The expression is case sensitive with names. So that is important. But I'm not sure if that is going to solve your issue.

I'm not sure why it was trying to reference "sky". Would you send over your project so I can take a look? I'll post all the information I get from it to this thread.

Thanks,
Trent

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Re: Making Light Disappear & Reappear Behind Objects Using Expressions
by pxlguy on Sep 24, 2007 at 4:30:26 pm

Justin,

I noticed when I opened your project that it said it had to be up-converted from 6.5. I hate to tell you this, but the sampleImage() (and therefore the whole effect) is only available in AE 8 (CS3).

If I am incorrect in thinking that your project is not AE 8, please let me know.

Trent

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