Add painted-height HUD sliders for AO shift and relief intensity

Wire three material-backed look sliders (occlusion AO shift, relief normal
intensity, parallax intensity) through the paint HUD, its layout/state
persistence, the .paint slot format (bumped to v4), owner-authoritative
network sync and the runtime reset, mirroring the existing camo-knob path so
they save, restore, replicate and reset alongside the brush values.

Change the occlusion AO mapping from a division threshold to a linear shift:
AO fades from 1 down to (1 - shift) at the deepest painted hole, so a 0 shift
no longer leaves black spots. Enable _NORMALMAP alongside _PARALLAXMAP so URP
transforms the painted relief normal into world space (otherwise it discards
normalTS and the relief is invisible), and pin the added keyword in the build
keep-alive material.

Stop the pipette from picking the occlusion/height value and turn its toggle
off after a pick. Default the knobs to 0.2 shift / 1.4 normal / 1.0 parallax
across the shader, painter, network and HUD fallbacks.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/PlayerPaintSync.cs

@@ -94,6 +94,14 @@ public class PlayerPaintSync : NetworkBehaviour
         new(new Vector3(0.5f, 0f, 0.1f), NetworkVariableReadPermission.Everyone, NetworkVariableWritePermission.Owner);
     private bool _camoApplyPending; // remote: apply _camo.Value to the material once IsReady / on change
 
+    // Painted-height knobs (x = occlusion AO threshold, y = relief normal intensity, z = parallax
+    // intensity). Same per-player material values as the camo knobs - not baked into the maps - so they
+    // ride their own owner-authoritative NetworkVariable and apply once the remote painter is ready. The
+    // default mirrors the PlayerCamoLit shader defaults (0.2 / 1.4 / 1).
+    private readonly NetworkVariable<Vector3> _height =
+        new(new Vector3(0.2f, 1.4f, 1f), NetworkVariableReadPermission.Everyone, NetworkVariableWritePermission.Owner);
+    private bool _heightApplyPending; // remote: apply _height.Value to the material once IsReady / on change
+
     // Monotonic message counter on the owner (one per stamp batch / checkpoint / restore); on every peer,
     // the highest sequence accounted for (applied to a remote replica / sent by the owner). Used as the
     // snapshot's cutoff marker so the join window neither loses nor double-applies events.
@@ -164,6 +172,10 @@ public class PlayerPaintSync : NetworkBehaviour
             _camo.OnValueChanged += OnCamoChanged;
             _camoApplyPending = true;
 
+            // Same deferred apply for the painted-height knobs.
+            _height.OnValueChanged += OnHeightChanged;
+            _heightApplyPending = true;
+
             // The server (host) has been present since the start, so its replica already holds the full
             // paint via the live stream; only a genuine late joiner needs the baseline pulled over.
             if (!IsServer)
@@ -191,6 +203,7 @@ public class PlayerPaintSync : NetworkBehaviour
         }
         _emissionIntensity.OnValueChanged -= OnEmissionChanged;
         _camo.OnValueChanged -= OnCamoChanged;
+        _height.OnValueChanged -= OnHeightChanged;
     }
 
     // Owner history events -> appended to the ordered outgoing FIFO, flushed in LateUpdate.
@@ -221,6 +234,7 @@ public class PlayerPaintSync : NetworkBehaviour
     // Apply on the next LateUpdate once the material is ready (the camo setters are a no-op before that,
     // and on a fresh spawn the OnValueChanged may arrive before the painter's Start has built the instance).
     private void OnCamoChanged(Vector3 previous, Vector3 current) => _camoApplyPending = true;
+    private void OnHeightChanged(Vector3 previous, Vector3 current) => _heightApplyPending = true;
 
     // ---- Live stamp stream (owner -> server -> remotes) ----
 
@@ -252,6 +266,16 @@ public class PlayerPaintSync : NetworkBehaviour
             _camoApplyPending = false;
         }
 
+        // Remote replica: apply the owner's painted-height knobs once the material exists / on change.
+        if (!IsOwner && _heightApplyPending && _painter && _painter.IsReady)
+        {
+            Vector3 h = _height.Value;
+            _painter.OcclusionThreshold = h.x;
+            _painter.HeightNormalIntensity = h.y;
+            _painter.ParallaxIntensity = h.z;
+            _heightApplyPending = false;
+        }
+
         if (!IsOwner)
             return;
 
@@ -282,6 +306,11 @@ public class PlayerPaintSync : NetworkBehaviour
             var camo = new Vector3(_painter.CamoHalfLambert, _painter.CamoHalfLambertBrightness, _painter.CamoSpecularDampen);
             if (_camo.Value != camo)
                 _camo.Value = camo;
+
+            // Publish the painted-height knobs the same way (delta-only, ready-gated).
+            var height = new Vector3(_painter.OcclusionThreshold, _painter.HeightNormalIntensity, _painter.ParallaxIntensity);
+            if (_height.Value != height)
+                _height.Value = height;
         }
 
         FlushOutgoing(unlimited: false);