Example Notes

Author: diwi

examples/FlowField/FlowField_LIC/FlowField_LIC.java

@@ -36,6 +36,19 @@
 
 public class FlowField_LIC extends PApplet {
 
+  
+  //
+  // Line Integral Convolution (LIC) Shader
+  //
+  // LIC is a  low-pass filter, for sampling and averaging  samples along the 
+  // streamlines of a flowfield (vector field).
+  //
+  // In this demo the flowfield is created by some simply mouse-drawing.
+  // The background texture the sample are taken from should contain 
+  // high-frequency noise for the LIC-Shader to work best.
+  //
+  //
+
   boolean START_FULLSCREEN = !true;
 
   int viewport_w = 1680;

examples/FlowField/FlowField_LIC_Image/FlowField_LIC_Image.java

@@ -35,6 +35,18 @@
 
 public class FlowField_LIC_Image extends PApplet {
 
+  //
+  // Line Integral Convolution (LIC) Shader
+  //
+  // LIC is a  low-pass filter, for sampling and averaging  samples along the 
+  // streamlines of a flowfield (vector field).
+  //
+  // In this demo the flowfield is created by some simply mouse-drawing.
+  // The background texture is loaded from an external image by M.C. Escher.
+  //
+  //
+  
+  
   boolean START_FULLSCREEN = !true;
 
   int viewport_w = 1680;

…ticalFlow/FlowField_Viz_OpticalFlow.java …ticalFlow/FlowField_LIC_OpticalFlow.javaexamples/FlowField/FlowField_LIC_OpticalFlow/FlowField_Viz_OpticalFlow.java renamed to examples/FlowField/FlowField_LIC_OpticalFlow/FlowField_LIC_OpticalFlow.java examples/FlowField/FlowField_LIC_OpticalFlow/FlowField_Viz_OpticalFlow.java renamed to examples/FlowField/FlowField_LIC_OpticalFlow/FlowField_LIC_OpticalFlow.java

@@ -35,7 +35,20 @@
 import processing.video.Capture;
 
 
-public class FlowField_Viz_OpticalFlow extends PApplet {
+public class FlowField_LIC_OpticalFlow extends PApplet {
+  
+  
+  //
+  // Line Integral Convolution (LIC) Shader
+  //
+  // LIC is a  low-pass filter, for sampling and averaging  samples along the 
+  // streamlines of a flowfield (vector field).
+  //
+  // In this demo the flowfield is created by some simply mouse-drawing.
+  // The background texture the webcam feed.
+  //
+  //
+  
 
   boolean START_FULLSCREEN = !true;
 
@@ -478,7 +491,7 @@ public void createGUI(){
 
 
   public static void main(String args[]) {
-    PApplet.main(new String[] { FlowField_Viz_OpticalFlow.class.getName() });
+    PApplet.main(new String[] { FlowField_LIC_OpticalFlow.class.getName() });
   }
 
 

examples/FlowField/FlowField_LIC_StreamLines/FlowField_LIC_StreamLines.java

@@ -18,7 +18,6 @@
 import com.jogamp.opengl.GL3;
 import com.thomasdiewald.pixelflow.java.DwPixelFlow;
 import com.thomasdiewald.pixelflow.java.flowfieldparticles.DwFlowFieldParticles;
-import com.thomasdiewald.pixelflow.java.flowfieldparticles.DwFlowFieldParticles.SpawnRect;
 import com.thomasdiewald.pixelflow.java.imageprocessing.DwFlowField;
 import com.thomasdiewald.pixelflow.java.imageprocessing.filter.DwFilter;
 import com.thomasdiewald.pixelflow.java.imageprocessing.filter.Merge;
@@ -38,6 +37,37 @@
 
 public class FlowField_LIC_StreamLines extends PApplet {
 
+  //
+  // Line Integral Convolution (LIC) Shader
+  //
+  // LIC is a  low-pass filter, for sampling and averaging  samples along the 
+  // streamlines of a flowfield (vector field).
+  //
+  //
+  // LIC:
+  //
+  // In this demo the flowfield is created by some simply mouse-drawing.
+  // The background texture the sample are taken from should contain 
+  // high-frequency noise for the LIC-Shader to work best.
+  //
+  //
+  // StreamLines:
+  //
+  // Additionally to the LIC filter, the streamlines are computed and rendered.
+  // This is quite expensive, since a lot of lines are required and each line
+  // needs a reasonable amount of vertices (10-40).
+  // All these vertices need to be generated on the fly by an alternating 
+  // update and render pass.
+  // In the beginning for each line a particle is spawned and during the update
+  // passes the particles positions are updated using verlet integration.
+  // In the successive render pass, the last particle-step is rendered as a line.
+  //
+  //
+  
+  
+  
+  
+  
   boolean START_FULLSCREEN = !true;
 
   int viewport_w = 1680;
@@ -279,7 +309,7 @@ public void draw(){
       int num_x = ceil(dim_x / (iterations * 0.5f));
       int num_y = ceil(dim_y / (iterations * 0.5f));
 
-      SpawnRect sr = new SpawnRect();
+      DwFlowFieldParticles.SpawnRect sr = new DwFlowFieldParticles.SpawnRect();
       sr.num = new int[]{num_x, num_y};
       sr.dim = new float[]{dim_x, dim_y};
       sr.pos = new float[]{0,0};

examples/FlowField/Fluid_Basic_LIC/Fluid_Basic_LIC.java

@@ -37,6 +37,7 @@ public class Fluid_Basic_LIC extends PApplet {
   // LMB: add Density + Velocity
   // MMB: draw obstacles
   // RMB: clear obstacles
+  //
 
   private class MyFluidData implements DwFluid2D.FluidData{