Nice one Achim
I'm positively sure I've never been able to get to the true potential
of the Replicate in Space patch for one reason: a lack of Mathematical
ability. All examples welcome in future.
Once men are caught up in an event, they cease to be afraid. Only the
unknown frightens men.
Antoine de Saint-Exupery
On 08/02/2011, at 7:13 PM, Achim Breidenbach wrote:
Hello Jim,
I am sorry, I missed your point about drawing a parabola. Just to
have another idea I did a compostition which draws a 2D math
function with a GLSL shader patch containing a GLSL Grid patch. (Use
the mouse to rotate the object). The magic happens in the vertex-
shader of the GLSL shader: the vertex points gets moved around by a
math function, in this case z = x * y. Maybe you can use this as a
starting point to draw a parabola.
<2D math function.qtz>
best.
Achim Breidenbach
Boinx Software
On 08.02.2011, at 08:38, Achim Breidenbach wrote:
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>
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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