diff --git a/hyper.h b/hyper.h
index c5dd6ed7..0a4accb5 100644
--- a/hyper.h
+++ b/hyper.h
@@ -1298,6 +1298,9 @@ namespace rug {
   rugpoint *addRugpoint(hyperpoint h, double dist);
   void buildRug();
 
+  bool in_crystal();
+  void physics();
+
 extern renderbuffer *glbuf; 
 extern eGeometry gwhere;
 extern bool no_fog;
diff --git a/screenshot.cpp b/screenshot.cpp
index 60fdf37b..356b521d 100644
--- a/screenshot.cpp
+++ b/screenshot.cpp
@@ -267,6 +267,7 @@ void saveHighQualityShot(const char *fname, const char *caption, int fade) {
     if(rug::rugged) {
       if(!rug::renderonce) rug::prepareTexture();
       glbuf.enable();
+      if(rug::in_crystal()) rug::physics();
       rug::drawRugScene();
       }
     else