### learning jitter expressions

I try to learn jitter expressions because there the core of jitter . Can you recommend good books (maths or other anything) that can help me to understand these "mysterious" expressions.

thanks in advance

the easiest way is to create a new object and start typing either "cv.jit.___" or "jit.___" and select any of the object expressions that appear in the drop-list. then (in edit mode) alt+click the object and learn more about, copy it, edit it-whatever you please.

I speak about jit.expr

oh-i’m sorry. my bad.

i have no idea. :(

there’s plenty of examples on the forum, as well as in the jitter recipes.

other that that, i would say, stay tuned to the cycling74 articles website.

Thanks , I know there plenty of articles but the problem is that i don’t have a knowledge base and when i want to put my ideas in practice i realize that i’m lost.

The forum is like a candy store. A lot of tastes hide the ingredients :)

I speak about expressions like :

expr " pow(min(norm[0] , sqrt(norm[1])) , 2.0)"

or

expr sin(norm[0]*(2*PI))*sin(norm[1]*(2*PI))

or

DEGTORAD, RADTODEG, E, LN2, LN10, LOG10E, LOG2E,

I was not very good of math ( I know basic geometry) so i tried to find some good books. I need to study analytic geometry or matrices? Can you recommend some books that will illuminate me ?

Thanks

gobo

i can’t really think of a much better resource than the googles.

this guy’s site is chock full of information and equations:

http://local.wasp.uwa.edu.au/~pbourke/geometry/

most of these geometric shapes can be created with jit.expr and jit.gl.mesh.

for a more concrete example, recently i wanted to create a spiral shape, so i googled spiral equations, or something like that, and found this:

http://www.mathematische-basteleien.de/spiral.htm

on down the page if found the spiral equation in needed

x=tcos(6t) y=tsin(6t) z=t

i plugged this into jit.expr using norm[0]*5 in place of t (found by experimenting), and plugged the output into jit.gl.mesh. viola.

‘jit.expr @expr (norm[0]*5)*cos(6*(norm[0]*5)) (norm[0]*5)*sin(6*(norm[0]*5)) (norm[0]*5)’

hopefully this is helpful, but if not, as mentioned, stay tuned.

Thanks , I will try to learn using trial and error. if I will be blocked , I will ask on forum.

@robtherich can you expand on how this works in patch form. i just tried to code this as u describe and i get nothing…

could you post your spiral patch so we can get an idea of how u implemented this.

thanks

j

**all**of the following text. Then, in Max, select

*New From Clipboard*.

```
----------begin_max5_patcher----------
838.3ocyX80aZCCD+Y3SgUzdnshghyeHvdh8kXuTUgLIFvcI1Laiftp9cew1
IizVCIqyDphHlbN19te2u67477vAdKYGvBOv2.2CFL34gCFnEoDLn54AdEnC
o4Hg907n38rkO5MxzkDePpE+HQNdc93MHZVNFrhw.yIzMXNQtPxQTwJFu..q
GFISOnxI5qvvZgqXTIEUf0c8CLOCQQM6SP9stOn+X+JwzcEDZNVpUM3Qgrcx
ZoAUR2hjoaHz0K33TowfiTSD.NU2D3C0OMarO3gpwXlF4SawlA34Mp7G3AUu
uLbn51Hm.aEXwFCnkwQ6WTvxvfbBEuPH4jsf45+umjI2.BFClmxxYb.D3WdA
AyQTIAkSPhi.rZ.orcT8pDZA0CbEpO6eE0CRZB6vjoplnvyA6knzhBTITb3i
6.VtSJYTKDvYIdcmMAa0tlTwlpueZqZIht14jICLABAqxYHYX.H12lMGc0B5
pfoJuevz1C5bg2+LHF9vVNXt99MzxrT26+vcw2dWJSbyj6ZH41W0sfPOS2VC
Cir3G7ckeH3iFF5WEMNQ0DGeocDkY5Dn0324IVsKOWjxwXJ3KV2l3xBTv11k
HvDQmLwjz5raR7g.FIa85brEKOvMomfgUoj7qsf1rChh15vfMANuj0YwBCuZ
AAyZhIgyZOWjNmsqyB8S7SVPEmkh12JpD0Ji2fJpclaCUTLkQ1Zbct58DZFa
upRIK.V7UtPx.SyznqDMR.javlY9cXyjKK13eZrwTOTU1m3Fa267hn4XZFle
BxQx09TFFbXVvklbn.iUaEq2QrfBSshBemWd7AqX.zQXPUUFyZTgbXTudPKI
XY4EliDXvRaUDeY4Gsls0TMVRX2oG0sZa5uBbasGPe2T7gwFC67Qib8dG+p.
K4rxE0lMdsKsL1DUz0sMdEtneW8wLdyGwQuZJ4uFrDrc7z5oq9DHfiKYFVHI
TjjTdT4iuj5qEz3k1Pxxvzl48KHYaYkNsJk3DtttpSpOITq5TRupRpCL2pJ8
Fr7hqSIcQmh5UcpKvTXupQcgK0uz6ftDw0uAbcJIPOqSvtvt62.txUK3yUZo
OcIJ6hWKt2wHXKZzjdWiBaQil9enQkO7xv+.k6sB+B
-----------end_max5_patcher-----------
```

thanks v much for the share.

j