Forums > Jitter

jit.gl.texture and dstdimstart | dstdimend

December 16, 2009 | 12:34 pm

i’d like to change only a part of an existing jit.gl.texture and tried doing so by using dstdimstart and dstdimend (and setting usedstdim to 1).

but that does not seem to work.
is there
a) a better / different way to achieve this or
b) am i doing something wrong ?

any help very much appreciated,
thanks a lot,

hannes koecher

here’s a testpatch:

– Pasted Max Patch, click to expand. –

December 18, 2009 | 8:07 pm

thanks for the report. i’ll take a look.


January 20, 2010 | 11:22 am

any news on this one ?

curious,
hannes


March 14, 2012 | 10:14 pm

having the same problem and the same question
1) is dstdimstart and dstdimend not working in jit.gl.texture ?
2) a better / different way to achieve this ?

best,
l.


March 17, 2012 | 9:52 pm

hi. thanks for bringing this to our attention. it looks like this got broke again with max 6.
i’ll get it fixed up for a future update.

you will want to use the message "subtex_matrix" to force jit.gl.texture to use the srd/dstdim attributes.


March 19, 2012 | 5:38 pm

thanks robert for looking at this.
is there a example how to use the subtex_matrix attribute.

my goal is to copy some scaled textures to an output texture
(which has a fixed size)

best,
l.


May 8, 2012 | 4:48 pm

still having a problem with max6 using subtex_matrix of the jit.gl.texture object.
the path, which is posted by hons does not work as expected in max6.

perhaps someone can post a patch which demonstrates how the message "subtex_matrix" works and how we have to use the dstdimstart and dstdimend messages.

thanks in advance,
l.


May 8, 2012 | 6:21 pm

hons’ patch is close, but it needs to use the subtex_matrix message to tell gl.texture to only copy a portion of the matrix (slight discrepancy with jit.matrix in this regard).

here’s a modified version:

– Pasted Max Patch, click to expand. –

May 9, 2012 | 11:26 am

hello robert,

thanks for explaining how it works !
perhaps it would be nice to put this somewhere in the documentation ;-)

but i have still a problem, if i change the crop section, some portion of the texture "hangs".
same behavior in max 5 and max 6

here is a patch, which demonstrates the error.

– Pasted Max Patch, click to expand. –

May 9, 2012 | 6:21 pm

well, this isn’t really an error. you are telling the texture to draw to only a portion of the rectangle, which it does.
you need to "clear" the texture before sending the subtex_matrix message, perhaps by sending a black matrix to the texture.


May 10, 2012 | 3:05 pm

i think, the main misunderstanding in using dstdimstart and dstdimend is, that we need a named matrix as an input.

i think hons and i thought, that we can crop a texture which the jit.gl.texture object. (which can be the output of an slab also )

perhaps it would be a nice feature in the future.
in the meantime we can use this crop shader:

http://cycling74.com/forums/topic.php?id=23618

best,
l.


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