>
> Message: 5
> Date: Wed, 11 Jan 2006 20:11:05 +0100
> From: Julien Silland <julious@daft...>
> Subject: Ripple transition
> To: Quartzcomposer-dev@list...
> Message-ID: <1AE3769A-D8D0-4B4C-A0A0-02E61884F7F5@daft...>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> Hi everyone,
>
> I'm in the process of creating a quartz comp to use in one of my app
> and I feel like I could use some help with the Core Image Ripple
> transition patch. I have been managing to create a decent transition
> comp, yet without completly understanding how the Shading Image input
> works. I have first noticed that the Ripple patch doesn't render at
> all if the shading input is not set. I've been to the apple website
> on Core Image and read that the shading image is related to
> transparency ("A CIImage that specifies an environment map with alpha
> values. Typically this image contains highlight and shadow."). So, I
> decided to create a fully transparent image and it worked fine enough
> for now. But I would greatly appreciate if anyone could explain to me
> what it precisely does and how I could use it to enhance the visual
> effect.
>
> I also would like to have an effect that matches as much as possible
> the ripple effect that Dashboard uses when one drops a widget on the
> workspace (the multiple ripple effect). Can this be achieved using
> Quartz Composer ? Should I use multiple ripple patch transitions ?
>
> Second, I have noticed that when the ripple transition is being
> performed between images (of same dimensions), there happens to be
> little "black holes" on the edges when the ripple gets nearby the
> border. I  do understand that the ripple needs to "pull" the pixels
> from the outside to the center and that when pixels on the edges are
> pulled, there's just nothing to draw. I've been able to get rid of
> these holes just by drawing the target image of the transition in
> another billboard placed in the background. Is there a more elegant
> way to do that ?
>
> Thanks in advance,
> Julien
>
>
Hi,

Funny, I've been learning QC for the sole purpose of doing what you
describe!!!   I haven't figured it out in QC yet, but I have very
successfully accomplished it with video motion tracking using
Max/MSP/Jitter.  But I am trying to create a patch that will do
multiple effects directly within QC.  Does anyone know how do motion
tracking and output an x-y coordinate?  For example, tracking a live
camera to apply the x-y or multiple coordinates to multiple or single
partlicle systems?  Once again, I've done it in Jitter, but the Jitter
particles are very difficult to work with.

Thanks,

Brian

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