Add hard edge to non-visible areas

shader/lighting/lineShadow.geom

@@ -3,14 +3,14 @@ layout (lines_adjacency) in;
 layout (triangle_strip, max_vertices = 4) out;
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 uniform vec3 lightPos;
-vec4 shift (vec4 p) { return (vec4 (p.xyz + (2000*(p.xyz-lightPos)), 1));}
+vec4 shift (vec4 p) { return (vec4 (p.xyz + (1000*(p.xyz-lightPos)), 1));}
 vec4 f (vec4 p) {return (theMat * p);}
 void main()
 {
     vec4 p0 = gl_in[0].gl_Position;
     vec3 n0 = gl_in[2].gl_Position.xyz;
     vec3 n1 = gl_in[3].gl_Position.xyz;
-    vec3 n2 = n0 + n1; // assumes the summands are normalized
+    //vec3 n2 = n0 + n1; // assumes the summands are normalized
     vec3 lightDir = p0.xyz - lightPos.xyz;
     // first test if the edge is part of the silhouette
     // that is, if the normals of the faces connected by the edge point in