Forums > Jitter

jitter super keystone? slanted screen projection…

April 18, 2006 | 1:04 pm

Hi Folks,

I’m looking for a function similar to rota or gridshape, to shape a
simple color matte into an isosceles trapezoid. The image is
projected onto an angled screen, and the projector’s keystone is not
radical enough.

all the best,

Bruce


April 18, 2006 | 5:37 pm

One way to accomplish this is with jit.gl.videoplane(rotate about the
x axis with the default perspective transform enabled), or more
flexibly using a texture mapped quadrilateral in jit.gl.sketch.
Either of these will use the GPU for faster mapping.

-Joshua


August 19, 2011 | 3:12 pm

Joshua Kit Clayton wrote :
"…or more flexibly using a texture mapped quadrilateral in jit.gl.sketch. "
This appears to be false. The result is different because rotation on videoplane follows the perspective rules, but "using a texture mapped quadrilateral in jit.gl.sketch" creates distortion, as I mentionned here :
http://cycling74.com/forums/topic.php?id=34796
Cheers,
Eric


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