Use quad intrinsics to compute trochoid normals

Simple algo. Use quad intrinsics to get neighboring pixels' (x & y)
positions in trochoid space. Compute tangent and bitangent from that.
Then normal as cross product. There's some artifacting on diagonal
boundaries.

1 files changed, 7 insertions, 0 deletions

diff --git a/Editor/tooner.cs b/Editor/tooner.cs
index 0d15a3a..310cfa6 100644
--- a/Editor/tooner.cs
+++ b/Editor/tooner.cs
@@ -1990,6 +1990,13 @@ public class ToonerGUI : ShaderGUI {
     bc = FindProperty("_Trochoid_Height_Scale");
     FloatProperty(bc, "Height scale");
 
+    bc = FindProperty("_Trochoid_Enable_Fragment_Normals");
+    enabled = (bc.floatValue != 0.0);
+    EditorGUI.BeginChangeCheck();
+    enabled = Toggle("Enable fragment normals", enabled);
+    EditorGUI.EndChangeCheck();
+    bc.floatValue = enabled ? 1.0f : 0.0f;
+
     EditorGUI.indentLevel -= 1;
   }