From 15f9778a65a0f163627bd229b8f212cc5c7c0c22 Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Tue, 28 Oct 2025 21:33:40 -0700
Subject: some ray marching

---
 3ner.cginc | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to '3ner.cginc')

diff --git a/3ner.cginc b/3ner.cginc
index da04aba..924e93e 100644
--- a/3ner.cginc
+++ b/3ner.cginc
@@ -14,6 +14,7 @@
 #include "lighting.cginc"
 #include "globals.cginc"
 #include "interpolators.cginc"
+#include "ray_marching.cginc"
 #include "vertex.cginc"
 
 v2f vert(appdata v) {
@@ -21,7 +22,7 @@ v2f vert(appdata v) {
   return (v2f) asfloat(-1);
 #endif
 
-    v2f o;
+  v2f o;
   UNITY_SETUP_INSTANCE_ID(v);
   UNITY_INITIALIZE_OUTPUT(v2f, o);
   UNITY_TRANSFER_INSTANCE_ID(v, o);
@@ -34,12 +35,18 @@ v2f vert(appdata v) {
   o.uv01.zw = v.uv1;
   o.uv23.xy = v.uv2;
   o.uv23.zw = v.uv3;
+  float3 obj_space_camera_pos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1.0));
   o.objPos = v.vertex;
 #if defined(_VERTEX_DEFORMATION_FRAGMENT_NORMALS) || defined(_VERTEX_DEFORMATION_TESSELLATION)
   o.objPos_orig = v.vertex;
 #endif
+#if defined(_RAY_MARCHING_BAKED_ORIGINS)
+  o.color = v.color;
+#endif
 
-  // Normal and tangent are in object space.
+  // Normal and tangent are in object space to allow for object-space
+  // vertex deformation logic later on. They are converted to world
+  // space inside the fragment shader.
   o.normal = v.normal;
   o.tangent = v.tangent;
 #if !defined(_VERTEX_DEFORMATION_FRAGMENT_NORMALS)
@@ -178,6 +185,9 @@ v2f domain(
 #endif
   o.normal = DOMAIN_INTERP(normal);
   o.tangent = DOMAIN_INTERP(tangent);
+#if defined(_RAY_MARCHING_BAKED_ORIGINS)
+  o.color = DOMAIN_INTERP(color);
+#endif
 
   propagateObjPos(o);
 
@@ -240,6 +250,14 @@ float4 frag(v2f i, uint facing : SV_IsFrontFace) : SV_Target {
   return 0;
 #endif
 
+#if defined(_RAY_MARCHING)
+  // TODO consider doing assignment inside function. It would clean up this
+  // call site.
+  RayMarchResult res = ray_march(i);
+  i.objPos = res.objPos;
+  i.normal = res.objNorm;
+  i.tangent.xyz = res.objTan;
+#endif
 #if defined(_VERTEX_DEFORMATION_FRAGMENT_NORMALS)
   deform_normal(i.objPos_orig, i.normal, i.tangent.xyz);
 #endif
-- 
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