[PD] [Gem][pix_threshold]

[patko]

 I've attached a patch that is supposed to render a particle system on a black 
background 
where all snaped white pixels should be turned progressively to alpha value 
following their luminance value,
with the help of [biquad] object.
 Sometimes it works, sometimes it doesn't, I couldn't figure out why.

 So I've attached a patch where we can see what I'm trying to achieve,
what am I doing wrong?

Patrice Colet

#N canvas 785 46 450 300 10;
#N canvas 340 107 682 322 gemwin 0;
#X obj 102 122 tgl 15 0 \$0-gemstart \$0-gemstart empty 17 7 0 10 -262144
-1 -1 0 1;
#X obj 102 161 r \$0-gemstart;
#X obj 102 182 select 1 0;
#X msg 184 245 destroy;
#X obj 102 239 t a;
#X obj 318 54 inlet;
#X obj 318 255 gemwin;
#X obj 318 100 t a a;
#X obj 318 287 outlet;
#X obj 350 128 route create destroy;
#X obj 350 150 t b;
#X msg 350 172 1;
#X obj 390 150 t b;
#X msg 390 172 0;
#X obj 350 195 t f;
#X msg 350 219 set \$1;
#X text 118 122 rendering;
#X msg 102 214 reset \, dimen 1024 768 \, create \, 1;
#X connect 1 0 2 0;
#X connect 2 0 17 0;
#X connect 2 1 3 0;
#X connect 3 0 4 0;
#X connect 4 0 7 0;
#X connect 5 0 7 0;
#X connect 6 0 8 0;
#X connect 7 0 6 0;
#X connect 7 1 9 0;
#X connect 9 0 10 0;
#X connect 9 1 12 0;
#X connect 10 0 11 0;
#X connect 11 0 14 0;
#X connect 12 0 13 0;
#X connect 13 0 14 0;
#X connect 14 0 15 0;
#X connect 15 0 0 0;
#X connect 17 0 4 0;
#X coords 0 -1 1 1 85 40 1 100 100;
#X restore 25 30 pd gemwin;
#N canvas 0 0 602 316 particle 0;
#X obj 195 22 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X text 325 163 set the number per frame;
#X text 323 191 set the age to kill at;
#X text 329 75 the velocity domain;
#X text 328 90 a sphere at 0 \, 0.2 \, 0;
#X text 329 109 radius = 0.3;
#X obj 199 231 part_render;
#X obj 200 106 part_size 1;
#X msg 290 83 2;
#X msg 260 82 1;
#X obj 199 193 part_killold 20;
#X obj 199 163 part_source 10;
#X obj 198 77 part_head;
#X obj 199 131 part_velocity sphere 0 0 0 0.05;
#X obj 198 49 gemhead 20;
#X obj 199 261 sphere 0.015;
#X connect 0 0 14 0;
#X connect 6 0 15 0;
#X connect 7 0 13 0;
#X connect 8 0 7 1;
#X connect 9 0 7 1;
#X connect 10 0 6 0;
#X connect 11 0 10 0;
#X connect 12 0 7 0;
#X connect 13 0 11 0;
#X connect 14 0 12 0;
#X restore 180 184 pd particle system;
#N canvas 537 175 479 405 biquad 0;
#X obj 111 356 pix_texture;
#X msg 93 122 bang;
#X text 126 119 draw the snapped texture;
#X msg 58 122 bang;
#X obj 111 181 t a b;
#X floatatom 246 194 3 0 1 2 fb0 - -;
#X floatatom 270 194 3 0 1 2 fb1 - -;
#X floatatom 294 194 3 0 1 2 fb2 - -;
#X floatatom 323 194 3 0 1 2 ff1 - -;
#X floatatom 347 194 3 0 1 2 ff2 - -;
#N canvas 0 0 450 300 init 0;
#X obj 104 258 outlet;
#X obj 154 258 outlet;
#X obj 204 258 outlet;
#X obj 254 258 outlet;
#X obj 304 258 outlet;
#X obj 244 59 inlet;
#X obj 388 158 t b;
#X msg 378 201 1;
#X msg 413 201 0;
#X obj 246 88 route 1;
#X obj 353 258 outlet;
#X obj 238 127 t b;
#X obj 193 105 t b b;
#X obj 277 115 t b b;
#X msg 277 135 1;
#X msg 140 213 0.4;
#X msg 104 214 0.7;
#X msg 175 214 0.6;
#X msg 277 215 0.6;
#X msg 312 213 0.6;
#X msg 247 215 0.5;
#X connect 5 0 9 0;
#X connect 6 0 7 0;
#X connect 6 0 8 0;
#X connect 7 0 3 0;
#X connect 8 0 1 0;
#X connect 8 0 2 0;
#X connect 8 0 4 0;
#X connect 8 0 10 0;
#X connect 9 0 12 0;
#X connect 9 1 13 0;
#X connect 11 0 17 0;
#X connect 11 0 20 0;
#X connect 11 0 18 0;
#X connect 11 0 19 0;
#X connect 11 0 15 0;
#X connect 12 0 16 0;
#X connect 12 1 11 0;
#X connect 13 0 14 0;
#X connect 13 1 6 0;
#X connect 14 0 0 0;
#X connect 15 0 1 0;
#X connect 16 0 0 0;
#X connect 17 0 2 0;
#X connect 18 0 4 0;
#X connect 19 0 10 0;
#X connect 20 0 3 0;
#X restore 356 121 pd init;
#X obj 110 234 pix_biquad;
#X floatatom 371 194 3 0 1 2 ff3 - -;
#X obj 246 212 pack 1 0 0 1 0 0;
#X obj 111 202 pix_snap 0 0 1024 768;
#X obj 110 162 alpha;
#X obj 296 248 cnv 15 160 120 empty empty empty 20 12 0 14 -24198 -66577
0;
#X floatatom 185 246 5 0 1 1 pass - -;
#X floatatom 241 246 5 0 1 1 other - -;
#X obj 111 324 pix_alpha;
#X obj 112 381 rectangle 5.33 4;
#X obj 360 94 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 1
1;
#X msg 26 87 quality \$1;
#X obj 26 68 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1
;
#X obj 18 241 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1
;
#X msg 18 260 rectangle \$1;
#X obj 400 224 loadbang;
#X obj 355 71 loadbang;
#X obj 168 66 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 1
1;
#X obj 259 66 s pd-biquad;
#X msg 256 38 loadbang;
#X msg 331 280 0.5 0.5 0.5;
#X msg 330 301 1 1 1;
#X msg 327 236 0;
#X msg 329 258 1;
#X obj 109 142 gemhead 30;
#X connect 0 0 20 0;
#X connect 1 0 35 0;
#X connect 3 0 14 0;
#X connect 4 0 14 0;
#X connect 4 1 14 0;
#X connect 5 0 13 0;
#X connect 6 0 13 1;
#X connect 7 0 13 2;
#X connect 8 0 13 3;
#X connect 9 0 13 4;
#X connect 10 0 5 0;
#X connect 10 1 6 0;
#X connect 10 2 7 0;
#X connect 10 3 8 0;
#X connect 10 4 9 0;
#X connect 10 5 12 0;
#X connect 11 0 19 0;
#X connect 12 0 13 5;
#X connect 13 0 11 0;
#X connect 14 0 11 0;
#X connect 15 0 4 0;
#X connect 17 0 19 1;
#X connect 18 0 19 2;
#X connect 19 0 0 0;
#X connect 21 0 10 0;
#X connect 22 0 0 0;
#X connect 23 0 22 0;
#X connect 24 0 25 0;
#X connect 25 0 0 0;
#X connect 26 0 33 0;
#X connect 26 0 34 0;
#X connect 26 0 31 0;
#X connect 26 0 32 0;
#X connect 27 0 21 0;
#X connect 28 0 35 0;
#X connect 30 0 29 0;
#X connect 31 0 19 3;
#X connect 32 0 19 4;
#X connect 33 0 19 1;
#X connect 34 0 19 2;
#X connect 35 0 15 0;
#X restore 184 242 pd biquad;
#N canvas 0 0 450 300 mask 0;
#X obj 189 181 colorRGB 0 0 0;
#X obj 189 213 rectangle 5.33 4;
#X obj 189 153 gemhead 10;
#X connect 0 0 1 0;
#X connect 2 0 0 0;
#X restore 179 161 pd mask;
#X text 33 138 would be a picture -->;
#X text 176 71 why the background doesn't appear?;
#X text 60 110 the subpatches are placed following order of rendering
;
#X text 78 206 pix_threshold should turn white pixels to alpha then
reveal background image;
#N canvas 0 0 450 300 background 0;
#X obj 69 39 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1 1
;
#X obj 70 206 rectangle 5.34 4;
#X obj 70 147 translateXYZ 0 0 -0.01;
#X obj 57 124 colorRGB 1 0 1 1;
#X obj 70 69 gemhead 0;
#X connect 0 0 4 0;
#X connect 2 0 1 0;
#X connect 3 0 2 0;
#X connect 4 0 3 0;
#X restore 179 138 pd background image;

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