diff -r 8a21bec5d45f -r e4e7db2435f8 front_processing/src/Smoke_manipulation/vsquare.pde
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/front_processing/src/Smoke_manipulation/vsquare.pde	Thu Mar 22 16:00:17 2012 +0100
@@ -0,0 +1,94 @@
+/*
+* This file is part of the TraKERS\Front Processing package.
+*
+* (c) IRI <http://www.iri.centrepompidou.fr/>
+*
+* For the full copyright and license information, please view the LICENSE_FRONT
+* file that was distributed with this source code.
+*/
+
+class vsquare {
+  int x;
+  int y;
+  float xvel;
+  float yvel;
+  float col;
+  
+  vsquare(int xIn,int yIn) {
+    x = xIn;
+    y = yIn;
+  }
+  
+  void addbuffer(int i, int u) {
+    if(i>0 && i<lwidth && u>0 && u<lheight) {
+      xvel += (vbuf[i-1][u-1].pressure*0.5
+      +vbuf[i-1][u].pressure
+      +vbuf[i-1][u+1].pressure*0.5
+      -vbuf[i+1][u-1].pressure*0.5
+      -vbuf[i+1][u].pressure
+      -vbuf[i+1][u+1].pressure*0.5
+      )*0.49;
+      yvel += (vbuf[i-1][u-1].pressure*0.5
+      +vbuf[i][u-1].pressure
+      +vbuf[i+1][u-1].pressure*0.5
+      -vbuf[i-1][u+1].pressure*0.5
+      -vbuf[i][u+1].pressure
+      -vbuf[i+1][u+1].pressure*0.5
+      )*0.49;
+    }
+  }
+  
+  void updatevels(int mvelX, int mvelY, TuioPoint pt) {
+    float adj = x;
+    float opp = y;
+    float dist;
+    float mod;
+    
+    if(pt != null) {
+      float XRev = map(pt.getX(), realWidth, realHeight, WIDTH, HEIGHT);
+      float YRev = map(pt.getY(), realWidth, realHeight, WIDTH, HEIGHT);
+      adj = x - XRev;
+      opp = y - YRev;
+      dist = sqrt(opp*opp + adj*adj);
+      if(dist < PENSIZE) {
+        if(dist < 4) dist = PENSIZE;
+        mod = PENSIZE/dist;
+        xvel += mvelX*mod;
+        yvel += mvelY*mod;
+      }
+    }
+    if(randomGust > 0) {
+      adj = x - randomGustX;
+      opp = y - randomGustY;
+      dist = sqrt(opp*opp + adj*adj);
+      if(dist < randomGustSize) {
+        if(dist < RES*2) dist = randomGustSize;
+        mod = randomGustSize/dist;
+        xvel += (randomGustMax-randomGust)*randomGustXvel*mod;
+        yvel += (randomGustMax-randomGust)*randomGustYvel*mod;
+      }
+    }
+    xvel *= 0.99;
+    yvel *= 0.98;
+  }
+  
+  void addcolour(int amt) {
+    col += amt;
+    if(col > 196) col = 196;
+  }
+  
+  void display(int i, int u) {
+    float tcol = 0;
+    if(i>0 && i<lwidth-1 && u>0 && u<lheight-1) {
+      tcol = (+ v[i][u+1].col
+      + v[i+1][u].col
+      + v[i+1][u+1].col*0.5
+      )*0.3;
+      tcol = (int)(tcol+col*0.5);
+    }
+    
+    fill(255-tcol, 255-tcol, 255-tcol);
+    rect(x,y,RES,RES);
+    col = 0;
+  }
+}