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i'm working on an multimedia project and I would like to draw a spiral (starting from the center ) on the ground .

not something amazing , just a simple thing in 2D .

how is the best way to realize that with Jitter (or maybe with the graphics objects of Max) ?

i'm working on an multimedia project and I would like to draw a  spiral (starting from the center ) on the ground .
not something amazing , just a simple thing in 2D .

how is the best way to realize that with Jitter (or maybe with the graphics objects of Max)  ?

thanks by advance for your help !
have a nice day 

how-to-draw-2d-spiral

One way to think of a spiral is the path drawn by a clock hand that is changing in length. Check out the length() and smoothstep() operators in gen.

One way to think of a spiral is the path drawn by a clock hand that is changing in length.   Check out the length() and smoothstep() operators in gen.   

the jit.gl.path help file demonstrates one more technique and output format for making a spiral.

just I can't find anything to make a spiral with jit.gl.path

also , in your patch Metamax , I missed a kind of gen objects jit.world . how I can find or compile it ?

sorry , i'm a kind of beginner in Jitter by the way .

Thanks for all your help !
just I can't find anything to make a spiral with jit.gl.path
also , in your patch Metamax , I missed a kind of gen objects jit.world . how I can find or compile it ?
sorry , i'm a kind of beginner in Jitter by the way . 

As others have point out, what you want to do is modulate (change) the amplitude of your oscillator ( sin/cos periodic function) over time. If none of this makes sense, then you need to start reading the linked article on Lissajous curves and review your high-school trigonometry notes.

As Rob pointed out, the jit.gl.path help file is a good starting point. Here is another implementation using jit.gl.mesh (which also takes a matrix of points and draws them to the screen).

A spiral is a special case of a simple Lissajous Curve

Thanks a lot for all your answers , that's help me a lot !

Just i'm on Max6 and apparently the Jit.world object doesn't exist . Can I replace that by something else ?

Thanks a lot for all your answers , that's help me a lot !
Just i'm on Max6 and apparently the Jit.world object doesn't exist . Can I replace that by something else ? 

All the patch are working , but in fact I would like this spiral built itself gradually , starting from the center on 60 seconds for exemple .

Sorry for all my questions . I'm quite fluent in Max/Msp but the logic of Jitter seems a bit more complicated for me .

Thanks a lot for your answers !
All the patch are working , but in fact I would like this spiral built itself gradually , starting from the center on 60 seconds for exemple . 

Sorry for all my questions . I'm quite fluent in Max/Msp but the logic of Jitter seems a bit more complicated for me .
Merci !


check out the jit.gl.path @evalin and @evalout attributes.

how to draw 2D spiral ?