new file mode 100644

@@ -0,0 +1,32 @@

+#version 150

+

+

+layout(triangles) in;

+layout(line_strip, max_vertices = 6) out;

+

+

+uniform mat4  view_projection;

+uniform float scale;

+

+

+in vec4 geom_normal[3];

+

+

+void primitive_(int i)

+{

+    gl_Position = view_projection *

+        (gl_in[i].gl_Position);

+    EmitVertex();

+    gl_Position = view_projection *

+        (gl_in[i].gl_Position + scale * geom_normal[i]);

+    EmitVertex();

+    EndPrimitive();

+}

+

+

+void main()

+{

+    primitive_(0);

+    primitive_(1);

+    primitive_(2);

+}