| Hi,
you can also use the "Replicate in Space" patch to draw an arch. I think it is one of the fastest ways, because the "iterations" are all done by simply transforming the view matrix in the GPU and doesn't need any recalculations of any QC patches.
|
Arch with Replicate Patch.qtz
Description: application/quartzcomposer
Please note that you have to do a bit of math to calculate the line start and line end parameter based on the radius of the arch. I just guess some. (btw. in George's composition this math is also missing)
best,
Achim Breidenbach Boinx Software
On 08.02.2011, at 05:26, George Toledo wrote: You could also do something like this (see attachment). It uses iterator, lfo, and line to make an arch. I set it to modulate between a circle and arch. The interpolation all have built in curves, and one can build custom curves as well. Double also, the timelines patch can be used in the same way.
(I can't remember 100%, but I think that I used GL Tools plugin on the composition that was attached by James, and you can find that plugin (patch) at http://kineme.net )
On Mon, Feb 7, 2011 at 10:01 PM, James Sheridan <[email protected]> wrote:
Attached is a composition by Geroge Toledo that may provide some insight
On 8/02/11 12:51 PM, Jim Thomason wrote:
What's my best bet for drawing some sort of an arc? The only built in
"primitive" type I could find are straight lines. I'd most need to
draw parabolas, so I can always use some _javascript_ to solve the
quadratic equation and spit out a bunch of small line segments to draw
one, but I wasn't sure if that was the best approach. Am I on the
right track, or is there something built in that I missed?
-Jim....
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