I thought I'd figured out [jit.unpack] several times but I don't think I do.
[jit.unpack 2 @jump 3 4 @offset 0 1] please correct me if I am wrong.
when objects like jit.gl.gridshape/videoplane/mesh etc. are set to @matrixoutput 1 ,
they output 12 planes. Appendix B explains what they are.
-to see the result you either connect directly to jit.gl.render.
or use a jit.gl.mesh or ...