OpenGL Terminology in Jitter

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below text taken from the following forum thread
https://cycling74.com/forums/topic/how-to-use-jit-expr-to-arrange-many-little-spheres-into-a-big-spherical-array？/

Basically there is normal jitter CPU and there is GL Jitter GPU. <– you knew that though. Sorta ‘s like how Max and MSP are different. when using a matrix to built geometry, each plane talks to a specific angle . plane 0 talks to x angle , plane 1 = y angle , plane 2 = z angle. So there are vertices, edges . textures , normal <–lights etc…

Lingo in a nutshell
an array is another way to say matrix and specific point (coord) in this 3d world matrix would be a vector.
DATA :

  • normal regular older Jitter. Data is in char values (0-255). Color and plane order = argb <–plane 0 1 2 3
  • 3d GPU (gl) Jitter Data is in float32 values (0.-1.) and the color order == rgba <–plane 0 1 2 3.

Jitter 3D (GPU), there 2 ways to play with DATA.

  • 3D geometry and plane <– Basically where the camera can move around
  • 2D pixels<– GLSL and shaders. The magnificient jit.gl.pix is a way of cheating where you don’t have to learn GLSL. It’s a nodal GLSL if you will.

3D and 2D gl are 2 completely different ways to play the game.
2d plane 0 1 2 3 talk to colors rgba AND 3D plane 0 1 2 <– talk to vertex positionnig.

Gen
jit.gen <– is a fast version of jit.op <– you use it to do math.
jit.gl.pix : is for 2d pixel playing on the GPU.
Important : when using gen <– the amount of planes going in must be the same as the amount of planes going out.

Using jit.gl.mesh
See it like you have a smashed up piece of paper/plane that you have to unfold, i.e. you unfold for the shape / unfold for the texture / the light and shadows/ the colors. Cheating with jit.gl.gridshape @matrixoutput 1 to jit.gl.mesh. <– by doing this move , you don’t have to do the math in gen.
here is an example of what I mean. <maxpat>

begin_max5_patcher----------

2157.3oc6Zk0iaaCD9Yu+JHzKsEXigH0cAJv19V9MDTXPKQayr5vPhZORP6u 8NjTRVxVxVV9nMEaBhrDOm4aN4v78GlYrL6MVgA5WQeAMa12eX1LUSxFlU88 LiD5agwzB0vLByRRXoBiG08IXuITsWvhYgBz1r32WjjEwPD3uhLTAigDaXnW X4vXg946lbLOkElUlpVAqpF4Qp0Ka4W+DwodjKKWtLlI6.W0Rg3ccCF0iIsL gmFyDEsG1VpHbCOc8hbf5z7oE1btyiHrevbS3GKh7GG7bSze1Y2zjJLEy4AA 61irRQ8lXVuI4rB.SnBdVZ6Mh3q1HOW4NXV8.8mxI8WO7f7wiiD0oBQdI2nG HxttQMcIdeKSu6FFM7yzwJhihrI1dJrp5KRKrRRYpktQxazKVgm.WOjt1mQf VSbDZC8EFhh9JWLuLcKM7YzprbDiFtAwS2VJli9iRgR6CWHPYoflHM94BoZI MNtWsP6dfXqagVnqqRuyxxskVnqcKj8rz0b8TJ0VX7EqqMDpK1TVfVyeA3CT hD2CyhA3llmSeG.Yp.8YTTV5OIPuRSEnPZYACZR8Af3QYHt.sJOKA8JW.ngR v..rjGFqnfbSDEVVZGBVsTx6HJNvgf4jjQV1x8gX5eyjQaX4LD+mRPEz2kxI LRSdnm9ZYxVzugnIR3EAxsswzTVQs.5mUehLgYPTVQugdG8seoWAiSOBF7MQ vXpDLDGmV1Hd9S1FAqweGxMC+eJgJx4uAzD39AvxW4wwn5uHUXdufJoGP07V .p1931g+zZ6VdSPaeB3VJ6UfyN.1Z4AGWopZ0SvNr+fA6fUXgF6Md75D5y1S 4Nf3q7nhI1GD5qKbPttvw534qy4QEanaYnmz+nsQ2SGarZSXu6O3g0lZ3.U5 CVN2QvKgUrAIXPb+m.k4znErTJ7hT+RG2R5pS9um1kxJV+YAW53.AlIv.LGa xpXmqM9FbR70xUqb5qvW6fqJ9trTHxR6wLbXqvkzz0WC0GruJDI1Saz07b.t aJ4VJxVuNl0C24NH2o7Gd4LWfJiOaqAXsszbZBSvxqzXaGX6xY6iXz7ZVNjS s1jowH.L.PextGX5Hm63wJEgqjuDMdoUEvttmvMr082SBVgRGwSxmNSWIV2Q OIUlZ0g4tIdRNB9pYFjEZUbFUXQfriQDyQmgzcLjVMPYpTD8cuyQzX84IF+u .+qKEf94wRGp8Jwxq35J1dlwJdL6EVdAXdzZemYP2tsUyyZMEIV80L0B48XS S7TcSlMMkydgWOeqlVo4.+H.loLWy9u4V6AStLfMadZIuwqpRp8P8Bt6.bJa DS0OtlpLmscL2gAyLXQfIOfaKWq7Mnmm47fGa8.2dBKWGmE9LKpMSXjskkxS aeLlNcGwVQKiEKVkkJJ3eSev.x7d6eEMjM3jSgHMJz32y4z5BhLyPl3YVpjH 5HaT4iVscf9f9PYNsYF0HRoa6Yx5C5OPmE.SVVrjlKEcUw7H0cJxxh61Uy7h YqDUcukmltGJJx1Nbm470aNxbWlAclbr0V0SwB3XKpdW.VwhEEzW5h1BZbbk Yc2k+MZJGLPYBtVDPLa5TGeYSQXdVbbG9U2yK8zSDn0GxdkGI1z4Laxdfgy2 VqDYzHki3qgfZcaSPWWzskCbX.MUtrxpdgfk.GJQr2.5TT41lvsc.1o8i4Hb u5LCF7Is6oG2gmndnCvWG3LzrUG84PrJENkaQG+88GNTBaypiKT4k45CQYsN V3PosMVL.OJL.a5UWEgSBBl8.B67fHi3OfpiZ6k82O5TjUlGVKqqzFPcIDvT .bN23O8KMPxdiaCOJhktuJPDuPZ8EcZlPgqCvEMtbq8CqEBOta.MdKNjGkhX UbkE7TYXRVc7kV0ypa7EUruvPHLRm3QtNlA9xg6J+im9MhmsygytSjLb05u6 gt7YchXpbOpNcUuLQGB4nDNKlkrOk64CzqibB9lPJI52ffvDxIHcfCsbs807 psuqCQ8luE1N3HbR0ofOMmD3Z54aqHGIPhkugcb8csNMg4SLszjSfuolv7.R E6dDBCNmHfM8YBaj.5UsykoW2L8qH11G5GphenJd0TEMGipXBjCEjUw+KcIV cEtWQlXOQ2IUG6ipRXEEz0rqKYAGtKtgzlcv5BKbUVYvAFnQ7cWjRKcY7Drx plJ47Eo6Y.QBLwAtxwaAqfos9MnIbOyjlV4eg3sKs6p6gJaaVdyw2laEzYdk fqoZ9ucNE6Rp3N4Happ9SzcgxmPQLOhkeobyjrDYeKhF922BfzuB0f27Lc78 0u4aagOMRdBYPeLxyiDD6CXtPUh9Hm0Td5eONhQBUXaa0NfcCH3aGUw9FM5+ ER6QawX6hwlJ5xNf3Zq7i4DfAR615NXr1eqJSCE7QkIy4D+aJX5HSopRmMvw TmL0cHAwo3XsDnfx9YlOBJeaBJedmBqRroWppKGPQ2cq6g9tB1udGU2XvA04 fzo.FCTjCqNi4fBbbXwMN3pKFK4H+OowIIG4kkeunm+agNdiAc7uazi6HHG6 6F0LFUGxciZHiQTMQpQa0u2scIIj8tkq8tgqCucqguYq8uUKkaq8pMoFPNVM I6d36u+vzNX3zOv83Rwnxkb2yHUQriJghKI98jJtSME2ICj9n3QVLmIk.QMQ zeTrtQvZaAc7ZG9gJyGpLJmc8pxbXM99wReoSc7lLwNkZ2USAcqY2EPBGbjf 5+2YL3QAl3w.l1Q.lV5+8m5+vo8OPJ+04neKbRLE0xyz77vZrcVT8YYQzodZ WL3LxppLkS+WSvOeBfY35kM4pRUu0sqQ1.a7wqM1ESAcpG1OBRqSpEOx5cc0 LEOk8vd02Z5FdmGNchzBNdMrtpIybNNpZWypu+QfoyMvz3xbGf7+5g+gC6bO A

end_max5_patcher-----------

</maxpat>

Taken from appendix B in the Jitter Documentation
Matrices with anywhere from two to 13 planes can be used. Planes 13 and up are reserved for later use and will currently be ignored. Each plane represents a different value in one of five groups: vertices, texture coordinates, normals, vertex color and edges. If enough planes are present to specify a given group, that group is used in rendering the matrix. To be used, each group must be totally present, with the exception of vertices. If only x and y values for vertices are present, the z coordinate of all vertices is set to 0, and an 2D image on the xy plane results.

  • plane 0: x coordinate of vertex
  • plane 1: y coordinate of vertex
  • plane 2: z coordinate of vertex
  • plane 3: s coordinate of texture at vertex, if textured
  • plane 4: t coordinate of texture at vertex, if textured
  • plane 5: x component of lighting normal at vertex
  • plane 6: y component of lighting normal at vertex
  • plane 7: z component of lighting normal at vertex
  • plane 8: red component of vertex color
  • plane 9: green component of vertex color
  • plane 10: blue component of vertex color
  • plane 11: alpha component of vertex co* r
  • plane 12: edge flag for connection to next vertex: if < 0, no line is drawn.
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