Add hard edge to non-visible areas

shader/wall/blank.geom

@@ -21,8 +21,8 @@ void main()
   vec4 a1 = theMat * p1;
   vec4 a2 = theMat * p2;
 //  if (0 > isLHS (a1.xy - a2.xy, a1.xy - "viewFromPoint")) {
-    vec4 p3 = vec4 (p1.xy,150,1);
-    vec4 p4 = vec4 (p2.xy,150,1);
+    vec4 p3 = vec4 (p1.xy,100,1);
+    vec4 p4 = vec4 (p2.xy,100,1);
     vec4 a3 = theMat * p3;
     vec4 a4 = theMat * p4;
 

shader/wall/texture.geom

@@ -17,8 +17,8 @@ void main()
 
 vec4 p1 = vec4 (gl_in[0].gl_Position.xy,0,1);
 vec4 p2 = vec4 (gl_in[0].gl_Position.zw,0,1);
-vec4 p3 = vec4 (p1.xy,150,1);
-vec4 p4 = vec4 (p2.xy,150,1);
+vec4 p3 = vec4 (p1.xy,100,1);
+vec4 p4 = vec4 (p2.xy,100,1);
 
 vec4 a1 = theMat * p1;
 vec4 a2 = theMat * p2;