From ddb25caba4ce941650d3fe77651bc378fa26cd71 Mon Sep 17 00:00:00 2001
From: Dario Sanchez <110812521+dswhy@users.noreply.github.com>
Date: Wed, 29 Apr 2026 14:31:03 +0200
Subject: [PATCH 1/2] Fix: IESSpotLight hot swap texture and dedup fixes.
 Update example. (#33502)

---
 src/nodes/lighting/IESSpotLightNode.js | 42 ++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/src/nodes/lighting/IESSpotLightNode.js b/src/nodes/lighting/IESSpotLightNode.js
index 044959bbba1622..4a096debd3a7bf 100644
--- a/src/nodes/lighting/IESSpotLightNode.js
+++ b/src/nodes/lighting/IESSpotLightNode.js
@@ -15,6 +15,25 @@ class IESSpotLightNode extends SpotLightNode {
 
 	}
 
+	/**
+	 * Constructs a new IES spot light node.
+	 *
+	 * @param {?SpotLight} [light=null] - The spot light source.
+	 */
+	constructor( light = null ) {
+
+		super( light );
+
+		/**
+		 * The texture node representing the IES texture.
+		 *
+		 * @type {?TextureNode}
+		 * @default null
+		 */
+		this._iesTextureNode = null;
+
+	}
+
 	/**
 	 * Overwrites the default implementation to compute an IES conform spot attenuation.
 	 *
@@ -32,11 +51,13 @@ class IESSpotLightNode extends SpotLightNode {
 
 			const angle = angleCosine.acos().mul( 1.0 / Math.PI );
 
-			spotAttenuation = texture( iesMap, vec2( angle, 0 ), 0 ).r;
+			this._iesTextureNode = texture( iesMap, vec2( angle, 0 ), 0 );
+
+			spotAttenuation = this._iesTextureNode.r;
 
 		} else {
 
-			spotAttenuation = super.getSpotAttenuation( angleCosine );
+			spotAttenuation = super.getSpotAttenuation( builder, angleCosine );
 
 		}
 
@@ -44,6 +65,23 @@ class IESSpotLightNode extends SpotLightNode {
 
 	}
 
+	/**
+	 * Overwritten to update the IES spot light texture.
+	 *
+	 * @param {NodeFrame} frame - A reference to the current node frame.
+	 */
+	update( frame ) {
+
+		super.update( frame );
+
+		if ( this._iesTextureNode !== null && this.light.iesMap ) {
+
+			this._iesTextureNode.value = this.light.iesMap;
+
+		}
+
+	}
+
 }
 
 export default IESSpotLightNode;

From 062a743fa753c839c6d5cd3e77a83829770645ea Mon Sep 17 00:00:00 2001
From: Shane <shane@constructivesoftware.com.au>
Date: Thu, 30 Apr 2026 00:14:29 +0800
Subject: [PATCH 2/2] MikkTSpace: Add `dispose()`, cache promise. (#33501)

Co-authored-by: Michael Herzog <michael.herzog@human-interactive.org>
---
 examples/jsm/libs/mikktspace.module.js | 43 ++++++++++++++++++++------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/examples/jsm/libs/mikktspace.module.js b/examples/jsm/libs/mikktspace.module.js
index 0a1baaa3a4339d..28da574cb35cea 100644
--- a/examples/jsm/libs/mikktspace.module.js
+++ b/examples/jsm/libs/mikktspace.module.js
@@ -117,12 +117,37 @@ export let wasm;
 
 export let isReady = false;
 
-export const ready = fetch(wasmDataURI)
-    .then((res) => res.arrayBuffer())
-    .then((buffer) => WebAssembly.instantiate(buffer, {
-        './mikktspace_module_bg.js': {__wbindgen_string_new, __wbindgen_rethrow}
-    }))
-    .then((result) => {
-        wasm = result.instance.exports;
-        isReady = true;
-    });
+let readyPromise = null;
+
+function initialize() {
+
+	return fetch( wasmDataURI )
+		.then( ( res ) => res.arrayBuffer() )
+		.then( ( buffer ) => WebAssembly.instantiate( buffer, {
+			'./mikktspace_module_bg.js': { __wbindgen_string_new, __wbindgen_rethrow }
+		} ) )
+		.then( ( result ) => {
+
+			wasm = result.instance.exports;
+			isReady = true;
+
+		} );
+
+}
+
+export const ready = {
+	then: function ( onFulfilled, onRejected ) {
+
+		if ( readyPromise === null ) readyPromise = initialize();
+		return readyPromise.then( onFulfilled, onRejected );
+
+	}
+};
+
+export function dispose() {
+
+	wasm = null;
+	isReady = false;
+	readyPromise = null;
+
+}