[DRAFT] playing around with transparency

com.unity.toonshader/Editor/UTS3GUI.cs

@@ -995,7 +995,7 @@ void OnOpenGUI(Material material, MaterialEditor materialEditor, MaterialPropert
             m_MaterialScopeList.RegisterHeaderScope(Styles.emissionFoldout, Expandable.Emission, GUI_Emissive, (uint)UTS_Mode.ThreeColorToon,
                 (uint)UTS_TransparentMode.Off, isTessellation: 0);
             m_MaterialScopeList.RegisterHeaderScope(Styles.outlineFoldout, Expandable.Outline, GUI_Outline, (uint)UTS_Mode.ThreeColorToon,
-                (uint)UTS_TransparentMode.On, isTessellation: 0);
+                (uint)UTS_TransparentMode.Off, isTessellation: 0);
 
             m_MaterialScopeList.RegisterHeaderScope(Styles.tessellationFoldout, Expandable.TessellationLegacy, GUI_Tessellation, (uint)UTS_Mode.ThreeColorToon,
                 (uint)UTS_TransparentMode.Off, isTessellation: 1);

com.unity.toonshader/Runtime/Shaders/URP/UniversalToonOutline.hlsl

@@ -42,7 +42,9 @@ VertexOutput vert(VertexInput v) {
     //end
     float Set_Outline_Width = (_Outline_Width * 0.001 * smoothstep(_Farthest_Distance, _Nearest_Distance,
         distance(objPos.rgb, _WorldSpaceCameraPos)) * _Outline_Sampler_var.rgb).r;
+#ifndef _UTS_OUTLINE_FORCE_VISIBLE
     Set_Outline_Width *= (1.0f - _ZOverDrawMode);
+#endif
     //v.2.0.7.5
     float4 _ClipCameraPos = mul(UNITY_MATRIX_VP, float4(_WorldSpaceCameraPos.xyz, 1));
     //v.2.0.7
@@ -70,10 +72,12 @@ VertexOutput vert(VertexInput v) {
 
 float4 frag(VertexOutput i) : SV_Target {
     //v.2.0.5
+#ifndef _UTS_OUTLINE_FORCE_VISIBLE
     if (_ZOverDrawMode > 0.99f)
     {
         return float4(1.0f, 1.0f, 1.0f, 1.0f); // but nothing should be drawn except Z value as colormask is set to 0
     }
+#endif
     _Color = _BaseColor;
     float4 objPos = mul(GetObjectToWorldMatrix(), float4(0, 0, 0, 1));
     //v.2.0.9

com.unity.toonshader/Runtime/Shaders/UnityToon.shader

@@ -1210,6 +1210,60 @@ Shader "Toon/Toon" {
             ENDHLSL
         }
 
+        // EXPERIMENT: visible outline for transparent materials. Drawn via the
+        // UniversalForwardOnly tag (URP transparent tag index 2) so it renders AFTER the
+        // body (UniversalForward, index 1), while the SRPDefaultUnlit "Outline" pass above
+        // stays as the transparency depth pre-pass (index 0). Uses hardcoded render state
+        // and _UTS_OUTLINE_FORCE_VISIBLE so it ignores the _ZOverDrawMode width collapse.
+        Pass {
+            Name "OutlineTransparent"
+            Tags {
+                "LightMode" = "UniversalForwardOnly"
+            }
+            Cull Front
+            ColorMask 15
+            ZWrite Off
+            Blend SrcAlpha OneMinusSrcAlpha
+            Stencil
+            {
+                Ref[_StencilNo]
+                Comp[_StencilComp]
+                Pass[_StencilOpPass]
+                Fail[_StencilOpFail]
+
+            }
+
+            HLSLPROGRAM
+            #pragma target 2.0
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #define _UTS_OUTLINE_FORCE_VISIBLE
+
+            //V.2.0.4
+            #pragma multi_compile _IS_OUTLINE_CLIPPING_NO _IS_OUTLINE_CLIPPING_YES
+            #pragma multi_compile _OUTLINE_NML _OUTLINE_POS
+            // Outline is implemented in UniversalToonOutline.hlsl.
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
+
+            //--------------------------------------
+            // GPU Instancing
+            #pragma multi_compile_instancing
+        #if UNITY_VERSION >= 202230 // Requires Universal RP 14.0.7
+            #include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DOTS.hlsl"
+        #else
+            #pragma multi_compile _ DOTS_INSTANCING_ON
+        #endif
+
+#ifdef UNIVERSAL_PIPELINE_CORE_INCLUDED
+            #include "URP/UniversalToonInput.hlsl"
+            #include "URP/UniversalToonHead.hlsl"
+            #include "URP/UniversalToonOutline.hlsl"
+#endif
+            ENDHLSL
+        }
+
         Pass
         {
             Name "Universal2D"