Index: yafray/intern/export_yafaray.cpp
===================================================================
--- yafray/intern/export_yafaray.cpp	(revision 183)
+++ yafray/intern/export_yafaray.cpp	(working copy)
@@ -1589,6 +1589,19 @@
 		SetParamFloat(yG, worldProp, "power", 1.0);
 		yG->paramsSetString("type", "gradientback");
 	}
+	// Sanne: add Sunsky background
+	// defaults taken from http://www.martin-sand.de/tutorials-sunsky-settings.php
+	else if (std::string("Sunsky") == bg_type)
+	{
+		//SetParam?(yG, worldProp, "from", 30.0, 100.0, 40.0); // later, from (single?) sun in scene?
+		SetParamFloat(yG, worldProp, "turbidity", 3.0);
+		SetParamFloat(yG, worldProp, "a_var", 1.0);
+		SetParamFloat(yG, worldProp, "b_var", 1.0);
+		SetParamFloat(yG, worldProp, "c_var", 1.0);
+		SetParamFloat(yG, worldProp, "d_var", 1.0);
+		SetParamFloat(yG, worldProp, "e_var", 1.0);
+		yG->paramsSetString("type", "sunsky");
+	}
 	else
 	{
 		SetParamColor(yG, worldProp, "color", 1.0, 1.0, 1.0);