Trying to make sync work

godot/shaders/border.gdshader

@@ -0,0 +1,25 @@
+@shader_type spatial;
+@render_mode unshaded;
+
+@uniform sampler2D albedo_texture;
+@uniform vec3 light_color = vec3(1.0, 1.0, 1.0);
+@uniform float outline_width = 0.05;
+@uniform vec3 outline_color = vec3(0.0, 0.0, 0.0);
+
+void fragment() {
+    // Fake directional light
+    vec3 light_dir = normalize(vec3(0.5, 1.0, -0.5));
+    vec3 norm = normalize(NORMAL);
+    float intensity = dot(norm, light_dir);
+
+    // Cel shading - Quantized lighting steps
+    float shade = step(0.1, intensity) * 0.3 +
+                  step(0.3, intensity) * 0.4 +
+                  step(0.6, intensity) * 0.3;
+
+    // Sample texture and apply shading
+    vec4 tex_color = texture(albedo_texture, UV);
+    vec3 final_color = tex_color.rgb * shade * light_color;
+
+    ALBEDO = final_color;
+}