jack@peacockvisualarts.co.uk

I'm working on a patch which draws planes using jit.gl.sketch based on some motion tracking using cv.jit.track which allows the user to 'paint' with their movement and have a couple of questions.

Is there a maximum number of objects that can be drawn using jit.gl.sketch? After the patch has been running for a few minutes (in which time it will have drawn hundreds of planes) the patch slows down dramatically, hitting reset brings it back up to speed.

Is there a way to clear individual draw commands after a certain time, eg after 200 planes have been drawn begin to erase the oldest as each new one is driven.

Any help or tips would be hugely appreciated, here is a simplified patch with out the motion tracking.

jit-gl-sketch-maximum-messages

I don't know if there's a maximum number of objects that can be drawn, but

your computer is going to slow down and grind to a halt way before you meet

any limit because it has to do calculations for each object that is being

You can use the commands cmd_replace, cmd_insert and cmd_delete with sketch

command lists so you might want to start using the cmd_replace message once

When you hit reset you are deleting the command list and thus starting again

from 0 planes - that's why the speed increases again.

On Mon, Oct 6, 2008 at 3:18 PM, jack Keenan wrote:

> I'm working on a patch which draws planes using jit.gl.sketch based on some

> motion tracking using cv.jit.track which allows the user to 'paint' with

> their movement and have a couple of questions.

> Is there a maximum number of objects that can be drawn using jit.gl.sketch?

> After the patch has been running for a few minutes (in which time it will

> have drawn hundreds of planes) the patch slows down dramatically, hitting

> Is there a way to clear individual draw commands after a certain time, eg

> after 200 planes have been drawn begin to erase the oldest as each new one

> Any help or tips would be hugely appreciated, here is a simplified patch

> #P newex 146 393 277 196617 jit.gl.render test @depth_enable 0 @erase_color

> #P message 366 431 68 196617 fullscreen $1;

> #P newex 146 452 359 196617 jit.window test @rect 420 420 1020 720

> #P number 116 60 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P number 44 53 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 170 204 153 196617 -0.149967 0.571492 0.;

> #P message 170 266 282 196617 glcolor 1. 0.02 0.52 0.15 , point $1 $2

> #P newex 171 288 295 196617 jit.gl.sketch test @name map @blend_enable 1

> #P comment 199 110 100 196617 the motion tracking is paked to a list and

> sent to the message box below and banged from the counter to draw the plane;

I don't know if there's a maximum number of objects that can be drawn, but
your computer is going to slow down and grind to a halt way before you meet
any limit because it has to do calculations for each object that is being
drawn.
You can use the commands cmd_replace, cmd_insert and cmd_delete with sketch
command lists so you might want to start using the cmd_replace message once
you get to 200 planes.

When you hit reset you are deleting the command list and thus starting again
from 0 planes - that's why the speed increases again.

>
> Hi list,
>
> I'm working on a patch which draws planes using jit.gl.sketch based on some
> motion tracking using cv.jit.track which allows the user to 'paint' with
> their movement and have a couple of questions.
>
> Is there a maximum number of objects that can be drawn using jit.gl.sketch?
> After the patch has been running for a few minutes (in which time it will
> have drawn hundreds of planes) the patch slows down dramatically, hitting
> reset brings it back up to speed.
>
> Is there a way to clear individual draw commands after a certain time, eg
> after 200 planes have been drawn begin to erase the oldest as each new one
> is driven.
>
> Any help or tips would be hugely appreciated, here is a simplified patch
> with out the motion tracking.
>
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #P newex 146 354 45 196617 r metro;
> #P newex 146 393 277 196617 jit.gl.render test @depth_enable 0 @erase_color
> 0. 0. 0. 1.;
> #P message 366 431 68 196617 fullscreen $1;
> #P toggle 349 431 15 0;
> #P newex 313 430 35 196617 sel 27;
> #P newex 270 430 40 196617 key;
> #P newex 146 452 359 196617 jit.window test @rect 420 420 1020 720
> @floating 1 @fsaa 1 @fsmenubar 0;
> #P number 116 60 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 114 173 32 196617 sel 1;
> #P message 114 88 42 196617 max $1;
> #N counter;
> #X flags 0 0;
> #P newobj 113 147 66 196617 counter;
> #P newex 113 119 45 196617 r metro;
> #P newex 17 108 45 196617 s metro;
> #P number 44 53 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P toggle 17 53 15 0;
> #P newex 17 77 42 196617 qmetro;
> #P message 123 267 34 196617 reset;
> #P message 170 204 153 196617 -0.149967 0.571492 0.;
> #P message 170 266 282 196617 glcolor 1. 0.02 0.52 0.15 , point $1 $2
> 0.2 , plane 0.22 0.4;
> #P newex 171 288 295 196617 jit.gl.sketch test @name map @blend_enable 1
> @depth_enable 0;
> #P window linecount 7;
> #P comment 199 110 100 196617 the motion tracking is paked to a list and
> sent to the message box below and banged from the counter to draw the plane;
> #P connect 12 0 3 0;
> #P connect 6 0 5 0;
> #P connect 5 0 8 0;
> #P connect 7 0 5 1;
> #P fasten 17 0 18 0 367 446 367 431;
> #P hidden connect 16 0 17 0;
> #P fasten 15 0 16 0 311 447 311 432;
> #P connect 2 0 1 0;
> #P connect 4 0 1 0;
> #P connect 3 0 2 0;
> #P fasten 18 0 14 0 371 451 151 451;
> #P connect 20 0 19 0;
> #P connect 10 0 12 0;
> #P connect 13 0 11 0;
> #P connect 11 0 10 0;
> #P connect 9 0 10 0;
> #P window clipboard copycount 21;
>
>

I would create my own system outside of jit.gl.sketch here, but i'm not sure whether there's an easier method. You should take a look at sending 'cmd_delete $1' to sketch, but i imageine the object still has to draw everything again once you delete one command from it's list. I never used sketch that much, can't really tell.

Here i draw last 200 planes that are input from a coll. Hope it's of any help...

Hi, thanks for all the advice, and Bas Van Der Graf thanks for the patch it does exactly what I was trying to work out.

I'm fairly new to gl land and clearly have a lot to learn, but its a hella fun!!

I'm fairly new to gl land and clearly have  a lot to learn, but its a hella fun!!

jit.gl.sketch maximum messages?