Re: [PD] GEM- simple img texturing into a circle

[Jaime Oliver]

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] 
> > 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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>


-- 
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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Re: [PD] GEM- simple img texturing into a circle

[B. Bogart]

Hi Jamie,

Why not:

a. texture a large plane with a circular alpha channel hole

b. model a large plane with a circular hole.

Both would be a mask that show through what is rendered behind them,
should be very fast, but not as flexible, as your ideas.

.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] 
> www.realidadvisual.org/jaimeoliver
> 
> www-crca.ucsd.edu/ 
> 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


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[PD] GEM- simple img texturing into a circle

[Jaime Oliver]

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]
www.realidadvisual.org/jaimeoliver
www-crca.ucsd.edu/
www.realidadvisual.org

9168 Regents Rd. Apt. G
La Jolla, CA 92037
USA


texturing test.pd
Description: Binary data


texturingtests_p3.pd
Description: Binary data
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