diff --git a/contexte.inc b/contexte.inc
index 31298aa..fed0dcb 100644
--- a/contexte.inc
+++ b/contexte.inc
@@ -16,6 +16,18 @@ global_settings { assumed_gamma 1.0 }
 
 #declare	ANGLE_CAM = 33;
 
+//---------------------------------------
+/*
+ *	deux macros pour des variations plus 'touchy'
+ */
+#macro Cos_01( X )
+  (0.5-0.5*cos( 3.141592654 * X))
+#end
+#macro Cos_010( X )
+  (0.5-0.5*cos( 2 * 3.141592654 * X))
+#end
+//---------------------------------------
+
 /*------------------------------------------------------------------*/
 /*
  *		outils de mise au point (smart tools)