Add instancing distance culling, scale deformation

* GPU instance distance culling now takes a min/max range
* Fold recovers ops from material, allowing state to persist across
  editor restarts
* Add scale node to vertex deformation framework
* Remove fold presets - dumb LLM idea, unused
* Drop more "undeform" code; unused, was for ray marching, which does
  not work well
* Fix reflection energy compensation; was using cloth math, which makes
  things too bright

1 files changed, 20 insertions, 0 deletions

diff --git a/vertex.cginc b/vertex.cginc
index 77412a9..2e0c1dd 100755
--- a/vertex.cginc
+++ b/vertex.cginc
@@ -15,6 +15,7 @@
 #define OPCODE_FBM 8
 #define OPCODE_PLANE_TO_HEMI_OCTAHEDRON 9
 #define OPCODE_HEMI_OCTAHEDRON_TO_PLANE 10
+#define OPCODE_SCALE 11
 
 #if defined(_VERTEX_DEFORMATION)
 
@@ -182,6 +183,19 @@ void apply_hemi_octahedron_to_plane_normal(inout float3 objPos, inout float3 obj
   hemi_octahedron_to_plane_normal(objPos, objNorm, objTan, p, r, s, t);
 }
 
+void apply_scale(inout float3 objPos, float4 v0, float f0) {
+  float3 k = v0.xyz;
+  float t = f0;
+  objPos = scale(objPos, k, t);
+}
+
+void apply_scale_normal(inout float3 objPos, inout float3 objNorm,
+    inout float3 objTan, float4 v0, float f0) {
+  float3 k = v0.xyz;
+  float t = f0;
+  scale_normal(objPos, objNorm, objTan, k, t);
+}
+
 void deform(inout float3 objPos) {
   const float t = getTime();
 
@@ -420,6 +434,9 @@ void deform(inout float3 objPos) {
         case OPCODE_HEMI_OCTAHEDRON_TO_PLANE:
           apply_hemi_octahedron_to_plane(objPos, v0, v1, v2, f0);
           break;
+        case OPCODE_SCALE:
+          apply_scale(objPos, v0, f0);
+          break;
       }
     }
   }
@@ -665,6 +682,9 @@ void deform_normal(inout float3 objPos, inout float3 objNorm, inout float3 objTa
         case OPCODE_HEMI_OCTAHEDRON_TO_PLANE:
           apply_hemi_octahedron_to_plane_normal(objPos, objNorm, objTan, v0, v1, v2, f0);
           break;
+        case OPCODE_SCALE:
+          apply_scale_normal(objPos, objNorm, objTan, v0, f0);
+          break;
       }
     }
   }