1 files changed, 9 insertions, 1 deletions
diff --git a/dev/a5-artrender/shaders/outline.vert b/dev/a5-artrender/shaders/outline.vert
index 302cfeb..58e1308 100644
--- a/dev/a5-artrender/shaders/outline.vert
+++ b/dev/a5-artrender/shaders/outline.vert
@@ -18,5 +18,13 @@ layout(location = 2) in vec3 left_normal;
 layout(location = 3) in vec3 right_normal;
 
 void main() {
-    gl_Position = proj_matrix * model_view_matrix * vec4(vertex,1);
+    vec3 e = (model_view_matrix * vec4(vertex, 1.0)).xyz;
+    vec3 n_vertex = vertex;
+    vec3 ln = (normal_matrix * vec4(left_normal, 1.0)).xyz;
+    vec3 rn = (normal_matrix * vec4(right_normal, 1.0)).xyz;
+    if (dot(ln, e) * dot(rn, e) < 0.0) {
+        n_vertex = vertex + thickness * normal;
+    }
+
+    gl_Position = proj_matrix * model_view_matrix * vec4(n_vertex,1);
 }