msd feature request

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marius schebella

30 Apr 2008 30 Apr '08

1:19 a.m.

hi, I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range and then just reduce speed and stop if the speed is lower than a certain threshold. probably I should try to implement this myself. but maybe I am only missing something. thanks, marius.

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Frank Barknecht

30 Apr 30 Apr

9:24 a.m.

Hallo, marius schebella hat gesagt: // marius schebella wrote:

...

I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range and then just reduce speed and stop if the speed is lower than a certain threshold. probably I should try to implement this myself. but maybe I am only missing something.

Are you looking for some kind of "air resistance" damping? I normally use an "nlink" or "tlink" to add a global damping to masses.

Ciao

Frank Barknecht _ ______footils.org__

marius schebella

7:47 p.m.

Frank Barknecht wrote:

...

Hallo, marius schebella hat gesagt: // marius schebella wrote:

...
I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range and then just reduce speed and stop if the speed is lower than a certain threshold. probably I should try to implement this myself. but maybe I am only missing something.

Are you looking for some kind of "air resistance" damping? I normally use an "nlink" or "tlink" to add a global damping to masses.

I am not quite sure how nlinks and tlink work. tLink seems to work with a vector that is not related to the current link vector but to absolute x/y, maybe nLink is what I need? but nlinks do not work for me at all, or are they no real links or is this a bug? tLink with a vector 1/1 seems to be the same as the plain link message. correct? and there seems to be no difference between a tLink 1/1 and a tLink 2/2?

I tried to use tLink to get global damping, but I am not sure how to do this (attached patch..) marius.

Nicolas Montgermont

8:05 p.m.

Here is the corrected version, you have to use two tLinks : one aginst x and one against y. n

marius schebella a écrit :

...

Frank Barknecht wrote:

...
Hallo, marius schebella hat gesagt: // marius schebella wrote:

...
I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range and then just reduce speed and stop if the speed is lower than a certain threshold. probably I should try to implement this myself. but maybe I am only missing something.

Are you looking for some kind of "air resistance" damping? I normally use an "nlink" or "tlink" to add a global damping to masses.

I am not quite sure how nlinks and tlink work. tLink seems to work with a vector that is not related to the current link vector but to absolute x/y, maybe nLink is what I need? but nlinks do not work for me at all, or are they no real links or is this a bug? tLink with a vector 1/1 seems to be the same as the plain link message. correct? and there seems to be no difference between a tLink 1/1 and a tLink 2/2?

I tried to use tLink to get global damping, but I am not sure how to do this (attached patch..) marius.

PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

-- http://nicomon.basseslumieres.org #N canvas 612 22 787 645 10; #X msg 270 41 create , 1; #X msg 146 208 Xmax 4 , Xmin -4 , Ymax 4 , Ymin -4; #X obj 93 518 route massesPos linksPos; #N canvas 365 99 589 496 gemrender 0; #X obj 171 206 inlet; #X obj 434 220 inlet; #X obj 387 404 curve 2; #X msg 524 286 $4 $5 0; #X msg 452 282 $2 $3 0; #X obj 171 229 unpack f f f; #X obj 387 359 gemhead; #X obj 140 288 gemhead; #X obj 140 403 translateXYZ 1.1 1 0; #X obj 140 348 color 1 0 0; #X obj 97 230 loadbang; #X msg 96 252 0; #X obj 191 54 gemhead; #X obj 387 302 loadbang; #X msg 387 324 0; #X obj 434 250 t b l l; #X text 241 53 this renders spheres and curves; #X obj 140 308 ortho; #X msg 220 81 bang , get massesPos; #X msg 191 110 get linksPos; #X obj 217 148 s to_msd; #X obj 206 286 sel 0 1 2; #X msg 207 308 0 1 0; #X obj 140 258 t b a; #X msg 217 328 1 0 0; #X msg 257 328 0.3 0.3 0.3; #X obj 140 449 circle 0.1; #X connect 0 0 5 0; #X connect 1 0 15 0; #X connect 3 0 2 2; #X connect 4 0 2 1; #X connect 5 0 23 0; #X connect 5 1 8 1; #X connect 5 2 8 2; #X connect 6 0 2 0; #X connect 7 0 17 0; #X connect 8 0 26 0; #X connect 9 0 8 0; #X connect 10 0 11 0; #X connect 11 0 7 0; #X connect 12 0 18 0; #X connect 12 0 19 0; #X connect 13 0 14 0; #X connect 14 0 6 0; #X connect 15 0 6 0; #X connect 15 1 4 0; #X connect 15 2 3 0; #X connect 17 0 9 0; #X connect 18 0 20 0; #X connect 19 0 20 0; #X connect 21 0 22 0; #X connect 21 1 24 0; #X connect 21 2 25 0; #X connect 22 0 9 1; #X connect 23 0 7 0; #X connect 23 1 21 0; #X connect 24 0 9 1; #X connect 25 0 9 1; #X restore 93 577 pd gemrender; #X msg 146 180 reset; #X msg 147 286 mass m2 1 100 -0.5 0.5; #X obj 39 389 msd2D; #N canvas 641 95 362 270 init 0; #X obj 101 167 r geminit; #X obj 101 189 outlet; #X msg 102 50 THIS WILL INIT THE GEMWIN ; geminit 0 ; geminit destroy ; geminit cursor 1 ; geminit border 1 ; geminit dimen 500 500 ; geminit offset 20 20 ; geminit menubar 1; #X obj 102 27 loadbang; #X connect 0 0 1 0; #X connect 3 0 2 0; #X restore 219 41 pd init; #X obj 219 62 gemwin; #X obj 29 347 r to_msd; #X msg 146 331 mass fix 0 100 0 0; #X text 235 407 $6 = power?; #X text 417 204 <-- click all these messages; #N canvas 135 163 589 368 gemmouse 0; #X obj 104 197 spigot; #X obj 154 197 spigot; #X obj 104 219 - 4; #X obj 155 218 - 4; #X obj 155 238 * -1; #X obj 104 71 gemmouse 8 8; #X obj 104 286 s to_msd; #X msg 104 262 posX m1 $1; #X msg 178 263 posY m1 $1; #X obj 112 163 0; #X obj 162 163 0; #X obj 171 98 t f f; #X obj 171 121 sel 1; #X text 252 58 mouse interaction; #X text 194 162 immediately output current mousepos on click; #X text 200 198 filter events , when button is not pressed; #X connect 0 0 2 0; #X connect 1 0 3 0; #X connect 2 0 7 0; #X connect 3 0 4 0; #X connect 4 0 8 0; #X connect 5 0 0 0; #X connect 5 0 9 1; #X connect 5 1 1 0; #X connect 5 1 10 1; #X connect 5 2 11 0; #X connect 7 0 6 0; #X connect 8 0 6 0; #X connect 9 0 0 0; #X connect 10 0 1 0; #X connect 11 0 12 0; #X connect 11 1 1 1; #X connect 11 1 0 1; #X connect 12 0 10 0; #X connect 12 0 9 0; #X restore 220 83 pd gemmouse; #X text 350 391 problem: with this method damping does not damp the current velocity , but is always aligned to the fix mass at 0/0... ; #X obj 161 548 spigot; #X obj 211 548 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0 1; #X text 232 546 show links; #X msg 271 61 destroy; #X msg 146 257 mass m1 0 100 0.5 0.5; #X msg 142 390 link l1 m1 m2 1 0 0 0 0.5; #X text 396 264 then use mouse to the green circle to push the red one around (press left mousebutton); #X text 292 258 (green); #X text 293 287 (red); #X text 293 327 (center); #X msg 142 452 tLink damp2 fix m2 0 5 1 0; #X msg 143 480 tLink damp2 fix m2 0 5 0 1; #X obj 116 128 t b b b b b b b b; #X obj 114 98 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1 -1; #X text 346 453 tLink following x; #X text 343 480 tLink following y; #X connect 0 0 8 0; #X connect 1 0 6 0; #X connect 2 0 3 0; #X connect 2 1 15 0; #X connect 4 0 6 0; #X connect 5 0 6 0; #X connect 6 0 2 0; #X connect 7 0 8 0; #X connect 9 0 6 0; #X connect 10 0 6 0; #X connect 15 0 3 1; #X connect 16 0 15 1; #X connect 18 0 8 0; #X connect 19 0 6 0; #X connect 20 0 6 0; #X connect 25 0 6 0; #X connect 26 0 6 0; #X connect 27 0 26 0; #X connect 27 1 25 0; #X connect 27 2 20 0; #X connect 27 3 10 0; #X connect 27 4 5 0; #X connect 27 5 19 0; #X connect 27 6 1 0; #X connect 27 7 4 0; #X connect 28 0 27 0;

marius schebella

8:37 p.m.

thank you, nicolas, that's perfect! did you have a look at nLink? I think it is not working. (os x). marius.

Nicolas Montgermont wrote:

...

Here is the corrected version, you have to use two tLinks : one aginst x and one against y. n

marius schebella a Ã©crit :

...
Frank Barknecht wrote:

...
Hallo, marius schebella hat gesagt: // marius schebella wrote:

...
I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range and then just reduce speed and stop if the speed is lower than a certain threshold. probably I should try to implement this myself. but maybe I am only missing something.

Are you looking for some kind of "air resistance" damping? I normally use an "nlink" or "tlink" to add a global damping to masses.

I am not quite sure how nlinks and tlink work. tLink seems to work with a vector that is not related to the current link vector but to absolute x/y, maybe nLink is what I need? but nlinks do not work for me at all, or are they no real links or is this a bug? tLink with a vector 1/1 seems to be the same as the plain link message. correct? and there seems to be no difference between a tLink 1/1 and a tLink 2/2?

I tried to use tLink to get global damping, but I am not sure how to do this (attached patch..) marius.

PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

-- http://nicomon.basseslumieres.org

Nicolas Montgermont

8:42 p.m.

nLink is deprecated for 3 years now... I've just removed it from the help files. n

marius schebella a écrit :

...

thank you, nicolas, that's perfect! did you have a look at nLink? I think it is not working. (os x). marius.

Nicolas Montgermont wrote:

...
Here is the corrected version, you have to use two tLinks : one aginst x and one against y. n

marius schebella a écrit :

...
Frank Barknecht wrote:

...
Hallo, marius schebella hat gesagt: // marius schebella wrote:

...
I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range and then just reduce speed and stop if the speed is lower than a certain threshold. probably I should try to implement this myself. but maybe I am only missing something.

Are you looking for some kind of "air resistance" damping? I normally use an "nlink" or "tlink" to add a global damping to masses.

I am not quite sure how nlinks and tlink work. tLink seems to work with a vector that is not related to the current link vector but to absolute x/y, maybe nLink is what I need? but nlinks do not work for me at all, or are they no real links or is this a bug? tLink with a vector 1/1 seems to be the same as the plain link message. correct? and there seems to be no difference between a tLink 1/1 and a tLink 2/2?

I tried to use tLink to get global damping, but I am not sure how to do this (attached patch..) marius.

PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

-- http://nicomon.basseslumieres.org

PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

-- http://nicomon.basseslumieres.org

Nicolas Montgermont

11:19 a.m.

marius schebella a écrit :

...

hi, I know, I am already too old for posting feature requests. I was just thinking that I miss the ability to damp the speed of masses in msd. right now I am using something like mass mass1 1 100 0 0 mass mass2 1 100 1 0 link l mass1 mass2 10 10 0 0.01 0 link l 1 I want that the masses reject each other within a certain range

To do that, you must link masses with a link with a Lmax value corresponding to the length of the link, for example: link rebound mass1 mass2 10 10 0 1

...

and then just reduce speed and stop if the speed is lower than a certain threshold.

The way to do that is to use some tangeantial link, simulating fluid resistance, you must introduce a resisting point: mass m0 0 100 0 0 and then link damping mass0 mass1 0 3 for the mass1 there is a damping in the msd/02_msdstring example

Nicolas

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Frank Barknecht
marius schebella
Nicolas Montgermont