I'm pretty determined to work through this! :-)
I thought I'd write a workaround to keep this conversation moving: My
plan was to write the video to a buffer with [pix_buffer], then read one
frame later and apply [pix_rtx]. I've done this workaround before for
similar situations.
But I got stuck before I even got to [pix_rtx]. Please see the attached
patch.
In the patch you'll see 3 toggles, all of which I would have expected to
show a rotated image textured onto a rectangle. Only one of them does.
They are numbered right to left.
Box 1 shows the output of [pix_buffer_write]. That shows a rotated
image. Fine so far.
Box 2 shows the output of [rotateXYZ] before [pix_buffer_write]. That
shows a rotated white box with no image textured. Why?
Box 3 shows the output of [pix_buffer_read]. That shows an image but no
rotation. Why? This one is especially troublesome to me.
I'm trying to make my questions as specific as possible. Please
understand I have looked at plenty of examples of [rotateXYZ] and I
understand the object and have made full use of it. And I have
previously read about [pix_separator] and know the archives that refer
to it. There's something else going on here about dataflow with Gem that
I don't get. I can make up 10 other examples with 10 other objects if I
have to.
-John
John Harrison wrote:
Thanks Hans. I know the example patch already and I have [pix_rtx]
working fine inasfar as I can get it to do what the example patch
already shows. I think my question is more about data flow and Gem. My
patch and [pix_rtx} are just an example of a more basic
misunderstanding I believe I have which has not been cleared up
despite many hours of work in Gem.
Could somebody explain to me my [pix_rtx] in my example patch appears
to be processed before the rotation instead of after?
-John
On Tue, Mar 24, 2009 at 9:33 PM, Hans-Christoph Steiner <h...@eds.org
<mailto:h...@eds.org>> wrote:
I think this is an appropriate place to discuss gem. In the Help
browser, check out:
examples -> Gem -> 04.video -> 04.videoRTX.pd
I had to do some trickery to get it working OK. Check the
archives for details, I remember some discussion about all the
separators.
.hc
On Mar 24, 2009, at 3:35 PM, John Harrison wrote:
Attached is a small example patch of how I just don't get
Gem...still...
[pix_rtx] has a steady wave that normally flows from left to
right.
I would have thought that the attached patch shows me rotating
the image first, then applying [pix_rtx]. So it would stand to
reason in my mind I would see a rotated image with [pix_rtx]
flowing from left to right.
But that isn't the result I see. The patch has [pix_rtx]
flowing from right to left now. It is as if [pix_rtx] is
applied *before* the rotation instead of *after* as I would
have expected.
Grasping at straws, I have tried [pix_separator] between just
about every object, but that makes no difference.
What am I misunderstanding that makes the behavior of the
patch make sense? And...how would I get [pix_rtx] to flow from
left to right on a mirrored image?
-John
P.S. Are questions like this better on the Gem-dev list?
That's a developer list but at the same time I feel a bit
awkward putting too many Gem questions on a Pd list
#N canvas 962 171 305 227 10;
#X obj 29 -58 gemhead;
#X obj 29 -35 pix_video;
#X obj 29 44 pix_texture;
#X obj 28 72 rectangle 4 3;
#X obj 159 9 gemwin;
#X msg 136 -34 create \, 1;
#X msg 214 -33 destroy;
#X obj 135 -57 loadbang;
#X obj 29 17 pix_rtx;
#X obj 29 -10 rotateXYZ 0 180 0;
#X connect 0 0 1 0;
#X connect 1 0 9 0;
#X connect 2 0 3 0;
#X connect 5 0 4 0;
#X connect 6 0 4 0;
#X connect 7 0 5 0;
#X connect 8 0 2 0;
#X connect 9 0 8 0;
_______________________________________________
Pd-list@iem.at <mailto:Pd-list@iem.at> mailing list
UNSUBSCRIBE and account-management ->
http://lists.puredata.info/listinfo/pd-list
----------------------------------------------------------------------------
There is no way to peace, peace is the way. -A.J. Muste
--
John Harrison
http://alumni.media.mit.edu/~harrison
#N canvas 373 161 758 508 10;
#X obj 472 38 gemhead;
#X obj 472 61 pix_video;
#X obj 59 322 pix_texture;
#X obj 59 352 rectangle 4 3;
#X obj 48 12 gemwin;
#X msg 25 -31 create \, 1;
#X msg 103 -30 destroy;
#X obj 24 -54 loadbang;
#X obj 625 -6 + 1;
#X floatatom 649 60 5 0 0 0 - - -;
#X floatatom 369 111 5 0 0 0 - - -;
#X obj 27 47 pix_buffer depot 3;
#X obj 370 83 % 3;
#X obj 625 21 % 3;
#X obj 506 123 pix_buffer_write depot;
#X obj 238 135 pix_buffer_read depot;
#X obj 369 32 int 0;
#X obj 414 -1 t b b;
#X obj 408 -51 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144
-1 -1;
#X obj 237 106 gemhead;
#X obj 441 -55 loadbang;
#X floatatom 555 46 5 0 0 0 - - -;
#X obj 413 -26 metro 50;
#X obj 370 56 + 1;
#X obj 625 -29 int 1;
#X obj 61 289 spigot 0;
#X obj 531 227 spigot 0;
#X obj 235 347 spigot 0;
#X obj 281 324 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X obj 105 263 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X obj 584 201 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X obj 504 88 rotateXYZ 60 60 0;
#X text 609 200 1 expected behavior;
#X text 302 326 2 no image;
#X text 130 258 3 no rotation;
#X obj 235 304 pix_separator;
#X connect 0 0 1 0;
#X connect 1 0 31 0;
#X connect 2 0 3 0;
#X connect 5 0 4 0;
#X connect 6 0 4 0;
#X connect 7 0 5 0;
#X connect 8 0 13 0;
#X connect 12 0 10 0;
#X connect 12 0 15 1;
#X connect 12 0 16 1;
#X connect 13 0 9 0;
#X connect 13 0 14 1;
#X connect 13 0 24 1;
#X connect 14 0 26 0;
#X connect 15 0 25 0;
#X connect 16 0 23 0;
#X connect 17 0 16 0;
#X connect 17 1 24 0;
#X connect 18 0 22 0;
#X connect 19 0 15 0;
#X connect 20 0 18 0;
#X connect 21 0 31 2;
#X connect 21 0 31 1;
#X connect 21 0 31 3;
#X connect 22 0 17 0;
#X connect 23 0 12 0;
#X connect 24 0 8 0;
#X connect 25 0 2 0;
#X connect 26 0 2 0;
#X connect 27 0 2 0;
#X connect 28 0 27 1;
#X connect 29 0 25 1;
#X connect 30 0 26 1;
#X connect 31 0 14 0;
#X connect 31 0 35 0;
#X connect 35 0 27 0;
_______________________________________________
Pd-list@iem.at mailing list
UNSUBSCRIBE and account-management ->
http://lists.puredata.info/listinfo/pd-list
