Move constants to macros; increase particle count

cloud.cpp

@@ -10,6 +10,8 @@
 #include "cloud.h"
 #include "util.h"
 
+#define COLOR_MIN 0.3f // minimum R/G/B value at 0,0,0 - also needs setting in field.cpp
+
 Cloud::Cloud(int num, 
              glm::vec3 box,
              int wrap) {
@@ -32,9 +34,10 @@ Cloud::Cloud(int num,
         particles[i].velocity.y = 0;  //randFloat() - 0.5;
         particles[i].velocity.z = 0;  //randFloat() - 0.5;
         
-        particles[i].color = glm::vec3(x*0.8f/WORLD_SIZE + 0.2f,
+        float color_mult = 1 - COLOR_MIN;
-                                       y*0.8f/WORLD_SIZE + 0.2f,
+        particles[i].color = glm::vec3(x*color_mult/WORLD_SIZE + COLOR_MIN,
-                                       z*0.8f/WORLD_SIZE + 0.2f);
+                                       y*color_mult/WORLD_SIZE + COLOR_MIN,
+                                       z*color_mult/WORLD_SIZE + COLOR_MIN);
     }
 }
 

field.cpp

@@ -9,6 +9,8 @@
 #include "field.h"
 #include "glm/glm.hpp"
 #define FIELD_SCALE 0.00050
+#define COLOR_DRIFT_RATE 0.001f // per-frame drift of particle color towards field element color
+#define COLOR_MIN 0.3f // minimum R/G/B value at 0,0,0 - also needs setting in cloud.cpp
 
 //  A vector-valued field over an array of elements arranged as a 3D lattice 
 
@@ -39,9 +41,10 @@ void field_init()
         field[i].val.y = (randFloat() - 0.5)*FIELD_SCALE;
         field[i].val.z = (randFloat() - 0.5)*FIELD_SCALE;
         // and set up the RGB values for each field element.
-        fieldcolors[i].rgb = glm::vec3(((i%10)*0.08) + 0.2f,
+        float color_mult = 1 - COLOR_MIN;
-                                       ((i%100)*0.008) + 0.2f,
+        fieldcolors[i].rgb = glm::vec3(((i%10)*(color_mult/10.0f)) + COLOR_MIN,
-                                       (i*0.0008) + 0.2f);
+                                       ((i%100)*(color_mult/100.0f)) + COLOR_MIN,
+                                       (i*(color_mult/1000.0f)) + COLOR_MIN);
     }
 }
 
@@ -73,7 +76,7 @@ void field_interact(glm::vec3 * pos, glm::vec3 * vel, glm::vec3 * color, float c
         field[index].val += temp;
         
         // add a fraction of the field color to the particle color
-        *color = (*color * 0.999f) + (fieldcolors[index].rgb * 0.001f);
+        *color = (*color * (1 - COLOR_DRIFT_RATE)) + (fieldcolors[index].rgb * COLOR_DRIFT_RATE);
     }
 }
 

interface.xcodeproj/project.pbxproj

@@ -57,7 +57,7 @@
 
 /* Begin PBXFileReference section */
 		08FB7796FE84155DC02AAC07 /* main.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = main.cpp; sourceTree = "<group>"; };
-		8DD76F6C0486A84900D96B5E /* interface */ = {isa = PBXFileReference; includeInIndex = 0; lastKnownFileType = "compiled.mach-o.executable"; path = interface; sourceTree = BUILT_PRODUCTS_DIR; };
+		8DD76F6C0486A84900D96B5E /* interface */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = interface; sourceTree = BUILT_PRODUCTS_DIR; };
 		B6BDADD115F4084F002A07DF /* audio.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = audio.h; sourceTree = "<group>"; };
 		B6BDADD315F4085B002A07DF /* audio.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = audio.cpp; sourceTree = "<group>"; };
 		B6BDADD515F40B04002A07DF /* libportaudio.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; path = libportaudio.a; sourceTree = "<group>"; };
@@ -321,6 +321,7 @@
 					/usr/local/lib,
 					/usr/local/Cellar/libpng/1.5.13/lib,
 				);
+				ONLY_ACTIVE_ARCH = NO;
 				OTHER_CPLUSPLUSFLAGS = (
 					"-O3",
 					"$(OTHER_CFLAGS)",

main.cpp

@@ -92,7 +92,7 @@ ParticleSystem balls(0,
                      0.0                        //  Gravity 
                      );
 
-Cloud cloud(100000,                             //  Particles
+Cloud cloud(200000,                             //  Particles
             box,                                //  Bounding Box
             false                               //  Wrap
             );