[jitter] constrain matrix to boundaries

Mon Oct 15 11:51:21 MDT 2007

hi, i have a "shatter"-based particle system which i would like to constrain
to a maximum radius (circle).
did anyone had success with boundary clipping of a matrix?
i *think* what i need is jit.clip with a second input for matrix. i tried
using jit.op (<p,max) but failed. another option was to find the distance of
each particle from center and constrain it if it is longer the allowed.

here is a patch

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#P comment 244 222 18 9109513 ??;
#P newex 50 219 191 9109513 jit.expr @expr "hypot(snorm[0] \\\, snorm[1])";
#P window linecount 2;
#P comment 180 155 227 9109513 and even if there was \, this matrix wont
help as every particle will only be checked against one point;
#P window linecount 1;
#P newex 52 99 105 9109513 jit.matrix 3 float32 10 8;
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#P newex 166 114 118 9109513 jit.scanwrap 3 float32 10 8;
#P newex 52 138 124 9109513 jit.op @op clip;
#P button 166 50 15 0;
#P newex 166 70 314 9109513 jit.gl.gridshape @shape circle @dim 80 1
@matrixoutput 1 @automatic 1;
#P comment 185 52 271 9109513 get outer ring and warp to fill all matrix;
#P comment 180 139 100 9109513 but there isnt one...;
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#P objectname jit.matrix[3];
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#P objectname jit.expr[1];
#P flonum 249 32 35 9 0 0 0 139 0 0 0 221 221 221 222 222 222 0 0 0;
#P window linecount 0;
#P newex 16 49 249 9109513 jit.expr @expr "in[0].p[0]*cos(PI/2.) -
in[0].p[1]*sin(PI/2.)" "in[0].p[1]*cos(PI/2.) + in[0].p[0]*sin(PI/2.)" in[0]
in[0] in[0];
#P objectname jit.expr;
#P inlet 16 31 15 0;
#P outlet 16 121 15 0;
#P connect 1 0 2 0;
#P connect 2 0 0 0;
#P connect 4 0 3 0;
#P connect 3 0 2 1;
#P pop;
#P newobj 50 205 102 9109513 p matrix2rotationZZZZ;
#B color 5;
#P newex 118 231 212 9109513 jit.expr @expr 0. 0. "atan2(in[0].p[1] \\\,
in[0].p[0])";
#P newex 285 158 33 9109513 r draw;
#P objectname receive[3];
#N vpatcher 370 221 928 467;
#P origin 0 -10;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 11 83 467 9109513 jit.expr @expr in[0]
"in[0].p[1]*cos(in[1])-in[0].p[2]*sin(in[1])"
"in[0].p[2]*cos(in[1])+in[0].p[1]*sin(in[1])" in[0] in[0];
#P objectname jit.expr[2];
#P window linecount 0;
#P newex 469 56 56 9109513 jit.unpack 3;
#P objectname jit.unpack;
#P newex 11 120 469 9109513 jit.expr @expr
"in[0].p[0]*cos(in[1])+in[0].p[2]*sin(in[1])" in[0]
"in[0].p[2]*cos(in[1])-in[0].p[0]*sin(in[1])" in[0] in[0];
#P objectname jit.expr[1];
#P newex 11 159 480 9109513 jit.expr @expr "in[0].p[0]*cos(in[1]) -
in[0].p[1]*sin(in[1])" "in[0].p[1]*cos(in[1]) + in[0].p[0]*sin(in[1])" in[0]
in[0] in[0];
#P objectname jit.expr;
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#P connect 2 0 6 0;
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#P origin 0 -10;
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#P objectname jit.op[3];
#P window setfont "Sans Serif" 14.;
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"(cell[0]%4>1)" "0." "(cell[0]%4.>0.)*(cell[0]%4.<3.)*0.1" "(cell[0]%4>1)*
0.1";
#P objectname jit.expr[1];
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#P newex 50 50 110 9109513 jit.matrix 5 float32 40 10;
#B color 4;
#P objectname jit.matrix[1];
#P inlet 50 30 15 0;
#P outlet 50 153 15 0;
#P comment 191 131 100 9109513 why?!;
#P connect 2 0 3 0;
#P connect 8 0 3 0;
#P connect 3 0 5 0;
#P connect 5 0 6 0;
#P connect 6 0 1 0;
#P connect 7 0 8 0;
#P fasten 3 0 4 0 55 71 103 71;
#P connect 4 0 5 1;
#P connect 7 0 6 1;
#P pop;
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norm[1];
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#P objectname jit.matrix[3];
#P outlet 50 312 15 0;
#P window linecount 2;
#P comment 218 287 100 9109513 < use the distance to clip motion to circle;
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#P fasten 10 0 8 0 290 226 123 226;
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#P pop;
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#P connect 3 0 6 0;
#P fasten 6 0 5 0 56 106 56 106;
#P connect 4 0 0 0;
#P connect 5 0 0 0;
#P connect 6 1 4 0;
#P pop;
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450;
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0. 0. 1.;
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1. 1. @blend_enable 1 @depth_enable 0 @texture numbers;
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#P newex 145 257 120 9109513 jit.op @op + + + pass pass;
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#P window linecount 2;
#P comment 415 202 83 9109513 how do i constrain position to circle?;
#P window linecount 1;
#P comment 357 258 137 9109513 look in quad_prepere for usage;
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#P fasten 7 2 11 0 101 102 53 102;
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#P connect 7 1 8 0;
#P fasten 18 0 9 1 77 49 93 49;
#P connect 22 0 14 0;
#P connect 14 0 15 0;
#P connect 15 0 19 0;
#P connect 15 1 16 0;
#P connect 20 0 2 0;
#P lcolor 1;
#P connect 2 0 6 0;
#P lcolor 1;
#P connect 24 0 23 0;
#P lcolor 1;
#P connect 23 0 4 0;
#P lcolor 1;
#P window clipboard copycount 28;
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