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barn doors effect on AE CS4 lights

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Zack Gietek
barn doors effect on AE CS4 lights
on Aug 9, 2010 at 10:43:28 am

Hello all-

Is it possible to adjust angle of light- not like the 'cone angle' but to 'squash' the light beam ....say ....horizontally, as if there were barndoors on the light??

thanks in advance

Z


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Michael Szalapski
Re: barn doors effect on AE CS4 lights
on Aug 9, 2010 at 1:47:00 pm

Make a 3d layer and use it as a barn door. Make sure it's set to cast shadows and the layer it's casting the shadow onto is set to accept shadows.

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Tudor "Ted" Jelescu
Re: barn doors effect on AE CS4 lights
on Aug 9, 2010 at 1:56:10 pm

Interesting question. I do not know if there's a way to adjust the shape of the light- maybe there will be someone who can help with that- but what you can do, is to have a 3d layer (black square, 400x400 pixel or so) with a mask (rectangle) cut in the middle, set in front of your light (perpendicular on the beam) and parented to it. Turn cast shadows on and there you have it- by manipulating the sides of the mask you get pretty much the same effect as you would from barn doors.

Tudor "Ted" Jelescu
Senior Compositor/VFX Artist
Bucharest, Romania


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Zack Gietek
Re: barn doors effect on AE CS4 lights
on Aug 9, 2010 at 4:49:27 pm

That'll do it!! thanks guys--that's great. I just have to make sure I set the light w/ 'barndoors' mask BEHIND the cam, as to not see it in my frame- SWEET!

thanks again


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Jon Bagge
Re: barn doors effect on AE CS4 lights
on Aug 9, 2010 at 7:51:13 pm

That'll do it!! thanks guys--that's great. I just have to make sure I set the light w/ 'barndoors' mask BEHIND the cam, as to not see it in my frame- SWEET!


If I remember correctly you can set the barndoor layers to 'shadow only'. That will make them invisible to the camera but they will still cast shadows. Thus you can have them in front of the camera without causing a problem.

--------------
Jon Bagge
Editor - London, UK
Avid - FCP - After Effects


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Steve Roberts
Re: barn doors effect on AE CS4 lights
on Aug 9, 2010 at 9:24:00 pm

Yes, but it should be noted that to completely cut off the light where the mask is, the light's shadow darkness have to be set to 100%. This would mean that all shadows cast by the light would be 100% dark.

I can't think of an alternative right now. Hm. Anybody?



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Zack Gietek
Re: barn doors effect on AE CS4 lights
on Aug 10, 2010 at 1:43:25 am

I just used an ambient light at about 15-30%, to combat that


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Steve Roberts
Re: barn doors effect on AE CS4 lights
on Aug 10, 2010 at 1:31:25 pm

Hmm ... but wouldn't the ambient light affect all shadows -- those cast by the mask and those cast by other elements such as text? In other words, wouldn't it dilute the darkness of the barn door effect?



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Zack Gietek
Re: barn doors effect on AE CS4 lights
on Aug 10, 2010 at 1:47:55 pm

sure it would, but I guess it depends on the application, in my particular situation, I'm only using the lights against, 2d plains- I'm highlighting text on documents- no 2.5d or 3d elements here....so I'm highlighting text, yet still want to see the rest of the document 'in the shadows' so to speak--without the ambient light, it is black everywhere except for what I am highlighting. So it's a little give an take with the light intensity levels between both lights to achieve the desired effect.....and for me it's working ;)


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Steve Roberts
Re: barn doors effect on AE CS4 lights
on Aug 10, 2010 at 4:28:06 pm

Well, there ya go. :-)



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