--- ray/src/rt/pmapamb.h	2016/05/17 17:39:47	2.5
+++ ray/src/rt/pmapamb.h	2024/09/17 16:36:04	2.6
@@ -1,4 +1,4 @@
-/* RCSid $Id: pmapamb.h,v 2.5 2016/05/17 17:39:47 rschregle Exp $ */
+/* RCSid $Id: pmapamb.h,v 2.6 2024/09/17 16:36:04 greg Exp $ */
 
 /* 
    ==================================================================
@@ -10,15 +10,19 @@
    supported by the Swiss National Science Foundation (SNSF, #147053)
    ==================================================================   
    
-   $Id: pmapamb.h,v 2.5 2016/05/17 17:39:47 rschregle Exp $
+   $Id: pmapamb.h,v 2.6 2024/09/17 16:36:04 greg Exp $
 */
 
 
 #ifndef PMAPAMB_H
    #define PMAPAMB_H
 
-   #include "pmapdata.h"   
+   #include "pmapdata.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
    int ambPmap (COLOR aval, RAY *r, int rdepth);
    /* Factor irradiance from global photon map into ambient coefficient
     * aval; return 1 on success, else 0 (with aval unmodified) */
@@ -26,4 +30,9 @@
    int ambPmapCaustic (COLOR aval, RAY *r, int rdepth);
    /* Factor irradiance from caustic photon map into ambient coeffiecient
     * aval; return 1 if successful, else 0 (with aval set to zero) */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif