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
all the best,
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 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 :
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