EDIT 6 august

I was upset by no any reply, but reading better i see that what i wrote just doesn't make sense, i mean was far to be clear

I hope the mod may lock this topic:
what i wish automate and why is better explained in the tutorial on Mathmap ( "[color=#FF0000]Fun and immediate results with the Matmap Composer, for Dummies ") that i will post shortly in the tut board.[/color]

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Well i hope the problem sufficiently generic to not require a speciphic knowledge of Mathmap syntax:

I like some MM script but a really dislike that they only make the effect centered in the very center of the image while i want be able to offset

Anyway Mathmap images have a infinite extension, are not cropped to canvas size, if not after rendering so could sort of solve
with this snippet



And the idea was

1 first offset as example
Offset_XY : offset_X = -0.5 Offset_Y =0.4

2 )Here as inside a sandwich the the filter to use i.e. "pond" "enhanced pond"

3) here the problem AUTOMATICALLY revert the offset
that is simple as multiply for -1 the values used for Offset_x and Offset Y in 1)

but if the math is trivial i had no success for 3...not sure were is the problem i try both to wrote a "normal" MM filter
and to use the composer to make a "composited filter...in both case no luck

No luck because some errors that literally crash MM so i can't even use it to locate the line where is the error
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I hope i was clear...the problem , and so the solution is the same for many filters but just to have a sort of template i will use Enhanced pond

So here my simple Offset_XY
1)


2 ) a filter to offset

filter enhanced_pond (image in, float max_freq: 1-10 (4),
float amp: 0-1 (0.02), float r_off: 0-1 (0.1))
in(ra+ra:[sin(max_freq/(r+r_off)+t*2*pi)*amp,0])
end

3 Again 1) to run with this values
Offset_X *(-1) , Offset_Y(-1)

the single pieces works but i fail to merge them in a single filter

well this is wat i get till now ..too bad that doesn't work and i have no idea why

stretched
filter pond_offset (stretched image in ,float offset_X: -1-1 (0),float offset_Y: -1-1 (0),float max_freq: 1-10 (4),
float amp: 0-1 (0.02), float r_off: 0-1 (0.1))
u=x+offset_X;
v=y+offset_Y;

#offset the image to filter
in(xy:[u,v])

#apply the filter
ra+ra:[sin(max_freq/(r+r_off)+t*2*pi)*amp,0]

# compensate the initial offset moving back to the original position
(xy:[x,y])
end

MM see a error in this line "in(xy:[u,v])" , and that confuse me even more because error should be after, maybe even before but not on that line

Please, a mod may lock this topic ? (why in the First message now edited )