whatever

zoneb/bin/data/shaders/particles/draw.frag

@@ -113,7 +113,7 @@ void main()
   float rate = 1-smoothstep(D - d, D + d, length(gPos.x + uBetween.x) + n);
   rate *= uAreThereTwoPeopleTween;
   vec3 remapedColor = mix(remapedColorC, remapedColorW, rate);
-  float alpha = max(0, 1 - pow(gAge,4)) * .2;
+  float alpha = max(0, 1 - pow(gAge,4)) * .03;
 
 //   if(vTemperature < 0.5) {
 //     alpha *= vTemperature * 2;

zoneb/bin/data/shaders/particles/draw.geom

@@ -6,10 +6,13 @@ layout (max_vertices = 4) out;
 // OF handled uniforms and attributes.
 uniform mat4 projectionMatrix;
 
+uniform float u_time;
+
 // App specific uniforms and attributes.
 // uniform float uSpriteSize;
 
 in vec4 vPosition[];
+in vec4 vPrevPosition[];
 in vec2 vTexCoord[];
 flat in int vValid[];
 
@@ -27,7 +30,7 @@ out float gAge;
 
 void main()
 {
-  float uSpriteSize = 1.5;
+  float uSpriteSize = 1;
   // if (vValid[0] == 0) return;
 
   texCoordVarying = vTexCoord[0];
@@ -36,19 +39,30 @@ void main()
   gTemperature = vTemperature[0];
   gAge = vAge[0];
 
+
   for (int i = 0; i < gl_in.length(); ++i)
   {
-    gl_Position = projectionMatrix * (vPosition[i] + vec4(1.0, -1.0, 0.0, 0.0) * uSpriteSize);
+    vec3 vOffset = (vPrevPosition[i].xyz - vPosition[i].xyz) * 4;
+    vOffset += normalize(vOffset) * 10;
+    // if(length(vOffset) < 4) {
+    //   vOffset = normalize(vOffset) * 4;
+    // }
+    vec4 shiftPos = vec4(vOffset, 1) + vPosition[i];
+
+    gl_Position = projectionMatrix * (vPosition[i] + vec4(0.0, 1.0, 0.0, 0.0) * uSpriteSize);
     EmitVertex();
 
-    gl_Position = projectionMatrix * (vPosition[i] + vec4(1.0, 1.0, 0.0, 0.0) * uSpriteSize);
+    if (u_time > 10) { // hack
+      gl_Position = projectionMatrix * (shiftPos + vec4(0.0, 1.0, 0.0, 0.0) * uSpriteSize);
       EmitVertex();
 
-    gl_Position = projectionMatrix * (vPosition[i] + vec4(-1.0, -1.0, 0.0, 0.0) * uSpriteSize);
+      gl_Position = projectionMatrix * (vPosition[i] + vec4(0.0, -1.0, 0.0, 0.0) * uSpriteSize);
       EmitVertex();
 
-    gl_Position = projectionMatrix * (vPosition[i] + vec4(-1.0, 1.0, 0.0, 0.0) * uSpriteSize);
+      gl_Position = projectionMatrix * (shiftPos + vec4(0.0, -1.0, 0.0, 0.0) * uSpriteSize);
       EmitVertex();
+    }
+
 
     EndPrimitive();
   }

zoneb/bin/data/shaders/particles/draw.vert

@@ -4,6 +4,7 @@ uniform sampler2DRect particles0;
 uniform sampler2DRect particles1;
 uniform sampler2DRect particles2;
 uniform sampler2DRect particles3;
+uniform sampler2DRect particles4;
 
 in vec4  position;
 in vec2  texcoord;
@@ -14,6 +15,7 @@ out vec4 vTarget;
 out float vTemperature;
 out float vAge;
 out vec4 vPosition;
+out vec4 vPrevPosition;
 
 void main()
 {
@@ -25,4 +27,5 @@ void main()
     vAge = misc.y;
     vPos = texture(particles0, vTexCoord).xyz;
     vPosition = modelViewMatrix * vec4(vPos, 1.0);
+    vPrevPosition = modelViewMatrix * vec4(texture(particles4, vTexCoord).xyz, 1.0);
 }

zoneb/bin/data/shaders/particles/update.frag

@@ -5,6 +5,7 @@ uniform sampler2DRect particles0;
 uniform sampler2DRect particles1;
 uniform sampler2DRect particles2;
 uniform sampler2DRect particles3;
+uniform sampler2DRect particles4;
 
 uniform sampler2DRect   u_depth;
 uniform sampler2DRect   u_world;
@@ -28,6 +29,7 @@ layout(location = 0) out vec4 posOut;
 layout(location = 1) out vec4 velOut;
 layout(location = 2) out vec4 misOut;
 layout(location = 3) out vec4 tarOut;
+layout(location = 4) out vec4 prevPosOut;
 
 
 vec3 random3(vec3 c) {
@@ -111,6 +113,7 @@ void main()
   vec3 vel = texture(particles1, texCoordVarying.st).xyz;
   vec3 misc = texture(particles2, texCoordVarying.st).xyz;
   vec4 target = texture(particles3, texCoordVarying.st).xyzw;
+  vec3 prevPos = pos;//texture(particles4, texCoordVarying.st).xyz;
 
   float fraction = 8;
   float thermo = texture2D(u_v4l2cam, texCoordVarying.st/fraction).r;
@@ -152,8 +155,8 @@ void main()
 
   if(vValid == 1 && target.w == 0) { // point valid && no target -> move to the point
     pos = posWorld.xyz;
+    // prevPos = posWorld.xyz;// + vec3(1,0,0);//random3(posWorld.xyz) * 0.5;
     age = 0;
-    target.xyz = pos;
   }
   else if (target.w > 0) { // targeted
     age += 0.002;
@@ -165,7 +168,7 @@ void main()
   }
 
   if(vValid == 1 && target.w > 0 && length(target.xy - pos.xy) < 100) { // arrived
-    age += 0.1;
+    age += 1;
   }
 
   // wandering
@@ -218,7 +221,6 @@ void main()
     force.y = sin(th) * cos(phi);
     force.z = sin(phi);
     force *= 200 + 200 * simplex3d_fractal(vec3(texCoordVarying, 0.0));
-    // force += (target.xyz - pos) * 0.3;
   }
 
   // damping
@@ -228,10 +230,12 @@ void main()
   vel += elapsed * force;
 
   // move
+  prevPos = pos;
   pos += elapsed * vel;
 
   posOut = vec4(pos, 1.0);
   velOut = vec4(vel, 0.0);
   misOut = vec4(thermo, age, 0, 0);
   tarOut = vec4(target);
+  prevPosOut = vec4(prevPos, 1.0);
 }

zoneb/src/ofApp.cpp

@@ -75,7 +75,7 @@ void ofApp::setupParticles()
   unsigned w = 512 * 4 * 2;
   unsigned h = 512 * 4 * 2;
 
-  particles.init(w, h, OF_PRIMITIVE_POINTS, false, 4);
+  particles.init(w, h, OF_PRIMITIVE_POINTS, false, 5);
 
   particles.loadShaders("shaders/particles/update", "shaders/particles/draw");
 
@@ -92,6 +92,7 @@ void ofApp::setupParticles()
     }
   }
   particles.loadDataTexture(ofxGpuParticles::POSITION, particlePosns);
+  particles.loadDataTexture(4, particlePosns); // prev pos
 
   // initial velocities
   particles.zeroDataTexture(ofxGpuParticles::VELOCITY);