Particles when dashing

util/rand.c

@@ -7,3 +7,8 @@ double rand_Double01() {
 	// Very bad implementation.
 	return ((double)rand()) / (double)RAND_MAX;
 }
+
+
+double rand_DoubleRange(double min, double max) {
+	return min + rand_Double01() * (max - min);
+}

util/rand.h

@@ -7,6 +7,8 @@ extern "C" {
 // returns a double in the [0,1) range.
 double rand_Double01();
 
+double rand_DoubleRange(double min, double max);
+
 #ifdef __cplusplus
 }
 #endif