From 46b30ed654b00746c131e575232f6f012d4e5004 Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Mon, 3 Nov 2025 11:57:59 -0800
Subject: fix normals in deformed ray marcher

---
 ray_marching.cginc | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

(limited to 'ray_marching.cginc')

diff --git a/ray_marching.cginc b/ray_marching.cginc
index f6f4bab..fe48f2c 100644
--- a/ray_marching.cginc
+++ b/ray_marching.cginc
@@ -105,10 +105,12 @@ void ray_march(inout v2f i) {
 
 #if defined(_VERTEX_DEFORMATION)
   // TODO optimize, we don't need to pass in `dummy`.
-  float3 dummy = 0;
-  float3 tmp_pos = ro;
-  undeform_normal(tmp_pos, dummy, rd);
-  rd = normalize(rd);
+  {
+    float3 dummy = 0;
+    float3 tmp_pos = ro;
+    undeform_normal(tmp_pos, dummy, rd);
+    rd = normalize(rd);
+  }
 #endif
 
   const float kMinDist = _Ray_Marching_Min_Dist;
@@ -157,6 +159,13 @@ void ray_march(inout v2f i) {
   }
 #endif
 
+#if defined(_VERTEX_DEFORMATION)
+  {
+    float3 tmp_pos = ro;
+    deform_normal(tmp_pos, lclNorm, lclTan);
+  }
+#endif
+
   i.objPos = lclPos;
   i.normal = lclNorm;
   i.tangent.xyz = lclTan;
-- 
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