Hi Ben > > Why not: > > a. texture a large plane with a circular alpha channel hole > > b. model a large plane with a circular hole.
I'll give that a try, I think i'll need some more flexibility since i need to have other polygons in the same patch... but maybe i can solve it in a different way... > > Both would be a mask that show through what is rendered behind them, > should be very fast, but not as flexible, as your ideas. Being fast is definitely going to be a requirement. Now, in this context, is flexibility a synonym for madness? or more precisely, is this approach too slow? best, J > > .b. > > Jaime Oliver wrote: > > Hello all, I am trying to do something which should be fairly easy: I am > > trying to see a circle that let's through an image that is behind it. > > (As if through a telescope...) So my attempt so far consists of > > texturing this image into a circle and compensate changes in translation > > and size of the circle with the pix_coordinate object. I have managed to > > do this with rectangles and triangles, but can't a find a way around > > circles. The main idea is the next: > > > > pix_image > > | > > pix_texture coordinate-mess > > | / > > pix_coordinate > > | > > rotateXYZ > > | > > translateXYZ > > | > > circle > > > > The coordinate message has this behaviour: > > -the 1st two floats don't have any effect. > > -the 3rd one compresses/expands left-right, > > -the 4th one compresses/expands up-down, > > -the 5th doesn't do anything, > > -the 6th one seems to offest the vertical compression/expanssion > > -any succesive floats have no effect. > > > > So my problem is that without any horixontal offest i can't compensate > > for size/transaltion values. If i had that i think i could do some math > > to do this.... > > > > Anyone has any suggestions? Is this the wrong approach?? > > > > I am attaching the patch if anyone want's to test this and I am also > > attaching an example of how i am compensating this for a polygon 3 > > > > best, > > > > J > > > > > > -- > > Jaime E Oliver LR > > > > [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > > www.realidadvisual.org/jaimeoliver > > <http://www.realidadvisual.org/jaimeoliver> > > www-crca.ucsd.edu/ <http://www-crca.ucsd.edu/> > > www.realidadvisual.org <http://www.realidadvisual.org> > > > > 9168 Regents Rd. Apt. G > > La Jolla, CA 92037 > > USA > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > PD-list@iem.at mailing list > > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > -- Jaime E Oliver LR [EMAIL PROTECTED] www.realidadvisual.org/jaimeoliver www-crca.ucsd.edu/ www.realidadvisual.org 9168 Regents Rd. Apt. G La Jolla, CA 92037 USA
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