From 1808c82c51db4afe7cc9148bc9d6f8c861d7bc20 Mon Sep 17 00:00:00 2001
From: Josef <josef.rissling@gmail.com>
Date: Wed, 2 Apr 2025 07:44:25 +0200
Subject: [PATCH] Shader Transform Update

---
 Runtime/Shading/Library/Transform.gdshaderinc | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Runtime/Shading/Library/Transform.gdshaderinc b/Runtime/Shading/Library/Transform.gdshaderinc
index 617d56c..b69d55d 100644
--- a/Runtime/Shading/Library/Transform.gdshaderinc
+++ b/Runtime/Shading/Library/Transform.gdshaderinc
@@ -52,6 +52,12 @@ vec3 worldToLocalDirection( vec3 _VERTEX, mat4 _MODEL_MATRIX )
   return ( mw * vec4( _VERTEX, 1.0 ) ).xyz;
 }
 
+
+vec3 worldToView( vec3 world, mat4 _VIEW_MATRIX )
+{
+  return ( _VIEW_MATRIX * vec4( world, 1.0 ) ).xyz;
+}
+
 vec3 worldToViewDirection( vec3 direction, mat4 _VIEW_MATRIX )
 {
   mat4 mw = _VIEW_MATRIX;
@@ -63,6 +69,35 @@ vec3 worldToViewDirection( vec3 direction, mat4 _VIEW_MATRIX )
   return ( mw * vec4( direction, 1.0 ) ).xyz;
 }
 
+vec3 viewToWorld( vec3 view, mat4 _INV_VIEW_MATRIX )
+{
+  return ( _INV_VIEW_MATRIX * vec4( view, 1.0 ) ).xyz;
+}
+
+vec3 viewToWorldDirection( vec3 view, mat4 _INV_VIEW_MATRIX )
+{
+  mat4 mw = _INV_VIEW_MATRIX;
+  mw[ 3 ][ 0 ] = 0.0;
+  mw[ 3 ][ 1 ] = 0.0;
+  mw[ 3 ][ 2 ] = 0.0;
+  mw[ 3 ][ 3 ] = 1.0;
+
+
+  return ( mw * vec4( view, 1.0 ) ).xyz;
+}
+
+vec3 viewToLocal( vec3 view, mat4 _INV_VIEW_MATRIX, mat4 _MODEL_MATRIX )
+{
+  vec3 world = viewToWorld( view, _INV_VIEW_MATRIX );
+  return worldToLocal( world, _MODEL_MATRIX );
+}
+
+vec3 viewToLocalDirection( vec3 view, mat4 _INV_VIEW_MATRIX, mat4 _MODEL_MATRIX )
+{
+  vec3 world = viewToWorldDirection( view, _INV_VIEW_MATRIX );
+  return worldToLocalDirection( world, _MODEL_MATRIX );
+}
+
 vec3 extractScale( mat3 _MODEL_NORMAL_MATRIX )
 {
   mat3 m = _MODEL_NORMAL_MATRIX;