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CC Particle World - Light Streaks - Edges

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Jen Milano
CC Particle World - Light Streaks - Edges
on Sep 3, 2009 at 9:02:31 pm

Hi there -

I am trying to create light streaks, using CC Particle World - I have been able to create them; however, they look to have sharp edges and somewhat aliased.

I've tried to tweak the settings, but to no avail.

The parameters I have tweaked are as follows:
Grid: Off
Birth Rate: 103 (to achieve smoother look, without breaks for the particles)
Longevity: 2.00

The Position values are parented via expression to a null.

Radius (x,y,z) = 0

All parameters under Physics are to 0

Particle Type: Lens Convex
Birth size: .08
Death Size: 0
Size Variation: 0
Max Opacity 47%
Transfer Mode: Composite


Any insight is always appreciated!

Thanks~


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Dave LaRonde
Re: CC Particle World - Light Streaks - Edges
on Sep 3, 2009 at 9:10:11 pm

Why not precomp the particles and put a blur on them?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Jens Enqvist
Re: CC Particle World - Light Streaks - Edges
on Sep 4, 2009 at 7:25:59 am

Perhaps you could use Lens Fade instead of Lens Convex.
Your Birth Rate and Longevity setting generates 200 000 particles (in NTSC), quite a lot. Probably many of the particles are stacked on top of each other, causing the aliasing. Lens Fade has softer edges which should make some difference.



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david bogie
Re: CC Particle World - Light Streaks - Edges
on Sep 4, 2009 at 3:06:19 pm

Trying to do streaks in AE without a streaking filter, like Trapcode, usually involves precomping and adding significant time manipulation or echofilters to the precomp. Easily done using CC TimeFX or TimeBlend although getting the settings is a bit tricky. For instance, one of those time filters requires two copies of the filter, one set to paste the other to copy. Very confusing and not necessarily explained in the docos.

Jens may point you to the tutorials on the Cycore site for the older CC filters that come with AE. Excellent material but still a bit confusing.

bogiesan



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Kevin Camp
Re: CC Particle World - Light Streaks - Edges
on Sep 4, 2009 at 5:39:02 pm

i think that jens is right... it's too many overlapping particles when the producer is moving slowly that is causing the aliasing effect.

you could try linking the birth rate to the null's speed with an expression. the idea here is to have the more particles emitted when the null is moving faster to keep the stroke solid, but fewer when it is moving slower to reduce the aliasing effect.

an expression like this for birth rate may work:

n = .5; // use this multiplier to modify how much speed affects birth rate
L = thisComp.layer("Null 1"); // this is your null

L.transform.position.speed * n


you'll need to direct it to use your null and then modify the n value to get the right number of particles.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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Kevin Camp
Re: CC Particle World - Light Streaks - Edges
on Sep 4, 2009 at 10:15:44 pm

i had a little time to play with this today... the combination of jen's suggestion to use a softer edged particle with the expression seemed to help quite a bit -- of course, i don't know the exact movement of your null/producer)...

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


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