Stone Design Forums

I've been playing with the Distort Function in T3, and it is way cool (the base function for Twirl and some of the other Geometry actions). However, I can't find any documentation on the constants that are used in the parametric equations. Some of them are obvious; I think (X, Y) is the image corner, but I can't figure out what d and D are. Anyone else?

This stuff kind of blows my mind. I just kind of play with stuff but haven't gotten a full grasp of these parameters.

I think TIFFany makes more sense if you know a little about digital signal processing, especially the names/hierarchy of the actions.

I was playing with the Geometry actions last weekend, and came up with a couple of new ones.
I called this one "Arch" since that's the effect I was trying for, but it is really just a sine wave applied to the image. You can change d/2 to adjust the amplitude of the wave, and x*s will adjust the frequency; x*s + n (where n is some number) will apply a phase shift to the wave.


Here's another, that I called "Perspective":

I came up with this more-or-less randomly, and it works best with small values of s in the slider. The image I'm attaching shows both of these effects applied to a text marquee copied from another image.[/code]

That explains why NASA liked it so much.

Didn't know that. A couple of other tools I use that do interesting things with images are ImageJ from NIH (free) and Igor Pro from Wavemetrics (non-free).

I remember Caffeine mentioning this on their web page.

That's some pretty neat stuff. I saved those formulas as new actions. Thanks!