Sam,
I actually just got to that point before I read
your message. This code does produce the desired
output based on the first row of the image however
when moving my mouse up and down the opacity of the
image changes rather than scanning through the y
values. This doesn't make sense to me. Could you try
this and suggest a reason why this happens?
-Nick
--- Sam Kass <email@hidden> wrote:
> Core Image kernel functions are called once for each
> output pixel.
> If I understand LinearImage, it's picking one raster
> (y value) out of
> the image and displaying that for the whole image?
> If so, then for
> each output pixel, you want to return the pixel that
> is in the same
> column, but a specified row. To duplicate what's on
> the web site,
> try something like the following, and hook it up to
> a mouse input
> (I'm coding in my email client, so there may be
> bugs):
>
> kernel vec4 linearImage(sampler image, float ycoord)
> {
> // get xy value
> vec2 xy = samplerCoord(image);
> // return image pixels for our column,
> specified row
> return sample(image, samplerTransform(image,
> vec2(xy.x, ycoord)));
> }
>
>
>
Send instant messages to your online friends http://au.messenger.yahoo.com
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Quartzcomposer-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/quartzcomposer-dev/email@hidden
This email sent to email@hidden
