move sign into v3.h

v3.h

@@ -12,6 +12,19 @@
 #define 	M_PI   3.1415926535897932384
 #endif
 
+static inline float
+sign(
+	const float x
+)
+{
+	if (x < 0)
+		return -1;
+	if (x > 0)
+		return +1;
+	return 0;
+}
+
+
 
 typedef struct
 {

wireframe.c

@@ -140,19 +140,6 @@ coplanar_check(
 }
 
 
-static inline float
-sign(
-	const float x
-)
-{
-	if (x < 0)
-		return -1;
-	if (x > 0)
-		return +1;
-	return 0;
-}
-
-
 
 /**
  * Add a vector to the list of edges if it is not already present