diff --git a/solidify/povray.c b/solidify/povray.c
index 535108c..b31b853 100644
--- a/solidify/povray.c
+++ b/solidify/povray.c
@@ -1,5 +1,5 @@
 /*
- * solid.c - Data structure and handling of a solid made of two opposing faces
+ * povray.c - Generate POV-Ray output
  *
  * Written 2010 by Werner Almesberger
  * Copyright 2010 by Werner Almesberger
@@ -70,7 +70,7 @@ static void sanitize(const char *s, char *res)
  */
 
 static void povray_face(const struct face *f, const char *side,
-    const char *prefix)
+    const char *prefix, int flip, double dist)
 {
 	int sz = f->a->max_z-f->a->min_z;
 
@@ -86,9 +86,15 @@ static void povray_face(const struct face *f, const char *side,
 "\t    scale <%g, %g, %g>\n"
 "\t    rotate <90, 0, 0>\n"
 "\t    translate <%g, %g, %g>\n"
+"\t    translate <0, 0, %g>\n"
+"%s"	/* flip bottom face */
+"\t    translate <0, 0, %g>\n"
 "\t}\n", prefix, side,
     f->sx*f->x_step, sz*f->z_step, f->sy*f->y_step,
-    -f->sx*f->x_step/2, f->sy*f->y_step/2, -sz*f->z_step/2);
+    -f->sx*f->x_step/2, f->sy*f->y_step/2, f->a->min_z*f->z_step,
+    -f->z_ref*f->z_step,
+    flip ? "\t    rotate <180, 0, 0>\n" : "",
+    dist*f->z_step);
 }
 
 
@@ -108,7 +114,7 @@ void povray(const char *name, const struct solid *s)
 
 	sanitize(name, tmp);
 	printf("#declare Part_%s =\n    intersection {\n", tmp);
-	povray_face(s->a, "top", name);
-	povray_face(s->b, "bot", name);
+	povray_face(s->a, "top", name, 0, s->dist/2);
+	povray_face(s->b, "bot", name, 1, -s->dist/2);
 	printf("    }\n");
 }