I noticed that, for high values of "rot", I get fairly large "titles" in the corners where the texture doesn't match the rest: http://downloads.qi-hardware.com/people/werner/m1/midi/corner-artefact.jpg When modulating "zoom", I can put them to good use, but they look a little odd when running with fixed zoom/rot and a "crowded" screen. Bug or feature ? - Werner
!!! "It's not a BUG,
/o o\ / it's a FEATURE!"
( > )
\ - /
_] [_ (jcooley 1991)
When distorting the current picture, when texture (i.e. source)
coordinates go off-screen, two things can happen:
1) the coordinates wrap around (i.e. the texture repeats)
2) the coordinates are clamped
Right now, you are seeing behaviour #1. You can go to #2 with this line:
bTexWrap=0
(it also works in per-frame equations, if you want to play with it)
You can also add a border in combination with bTexWrap=0, to make those
area black. Try this:
ob_a=1
ob_size=0.01
(There are also ob_[r|g|b] to change the color, defaults are 0)
S.
On 11/01/2011 12:24 PM, Werner Almesberger wrote:
> I noticed that, for high values of "rot", I get fairly large
> "titles" in the corners where the texture doesn't match the rest:
>
> http://downloads.qi-hardware.com/people/werner/m1/midi/corner-artefact.jpg
>
> When modulating "zoom", I can put them to good use, but they look
(Continue reading)
S?bastien Bourdeauducq wrote: > Right now, you are seeing behaviour #1. You can go to #2 with this line: > bTexWrap=0 > (it also works in per-frame equations, if you want to play with it) Cool, thanks ! Of course I want to play with it(Continue reading)Here's a short video: http://downloads.qi-hardware.com/people/werner/m1/demo/MVI_1765.MOV It's rotated. To unrotate, play with mplayer -vf rotate=2 Audio: "Love Tractor Part 1" from "Doghouse Riley" (the full song uses samples from Lessig, but the extract in the video is just an instrumental part). CC-BY. http://ccmixter.org/files/Doghouse/18888 http://ccmixter.org/content/Doghouse/Doghouse_-_Love_Tractor_Part_1.mp3 I assigned bTexWrap to a button on the nK2. So the default would be clamping and it would only wrap (as it did in the videos before) when I press the button. The effect is most visible when inverting the zoom, so that the screen content is pulled towards the center: 00:03 smooth traces from the border (with clamping) 00:06 oops, missed the border, let's try this again ... 00:10 distortion producing "kaleidoscope" patterns (without clamping) 00:13 and once more
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