Bruce mowson

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 

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.

jitter-super-keystone-slanted-screen-projection

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.

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.

"...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 :

https://cycling74.com/forums/cornerpins-and-keystone

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 :
https://cycling74.com/forums/cornerpins-and-keystone
Cheers,
Eric


jitter super keystone? slanted screen projection...