diff --git a/src/materials/nodes/InstancedPointsNodeMaterial.js b/src/materials/nodes/InstancedPointsNodeMaterial.js
index 0d7278225f5bdd..4c28af986f1f6c 100644
--- a/src/materials/nodes/InstancedPointsNodeMaterial.js
+++ b/src/materials/nodes/InstancedPointsNodeMaterial.js
@@ -13,6 +13,15 @@ import { PointsMaterial } from '../PointsMaterial.js';
 
 const _defaultValues = /*@__PURE__*/ new PointsMaterial();
 
+/**
+ * Unlike WebGL, WebGPU can render point primitives only with a size
+ * of one pixel. This type node material can be used to mimic the WebGL
+ * points rendering by rendering small planes via instancing.
+ *
+ * This material should be used with {@link InstancedPointsGeometry}.
+ *
+ * @augments NodeMaterial
+ */
 class InstancedPointsNodeMaterial extends NodeMaterial {
 
 	static get type() {
@@ -21,39 +30,75 @@ class InstancedPointsNodeMaterial extends NodeMaterial {
 
 	}
 
-	constructor( params = {} ) {
+	/**
+	 * Constructs a new instanced points node material.
+	 *
+	 * @param {Object?} parameters - The configuration parameter.
+	 */
+	constructor( parameters = {} ) {
 
 		super();
 
-		this.lights = false;
-
-		this.useAlphaToCoverage = true;
-
-		this.useColor = params.vertexColors;
-
+		/**
+		 * This flag can be used for type testing.
+		 *
+		 * @type {Boolean}
+		 * @readonly
+		 * @default true
+		 */
+		this.isInstancedPointsNodeMaterial = true;
+
+		/**
+		 * Whether vertex colors should be used or not. If set to `true`,
+		 * each point instance can receive a custom color value.
+		 *
+		 * @type {Boolean}
+		 * @default false
+		 */
+		this.useColor = parameters.vertexColors;
+
+		/**
+		 * The points width in pixels.
+		 *
+		 * @type {Number}
+		 * @default 1
+		 */
 		this.pointWidth = 1;
 
+		/**
+		 * This node can be used to define the colors for each instance.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.pointColorNode = null;
 
+		/**
+		 * This node can be used to define the width for each point instance.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.pointWidthNode = null;
 
+		this._useAlphaToCoverage = true;
+
 		this.setDefaultValues( _defaultValues );
 
-		this.setValues( params );
+		this.setValues( parameters );
 
 	}
 
+	/**
+	 * Setups the vertex and fragment stage of this node material.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	setup( builder ) {
 
-		this.setupShaders( builder );
-
-		super.setup( builder );
+		const { renderer } = builder;
 
-	}
-
-	setupShaders( { renderer } ) {
-
-		const useAlphaToCoverage = this.alphaToCoverage;
+		const useAlphaToCoverage = this._useAlphaToCoverage;
 		const useColor = this.useColor;
 
 		this.vertexNode = Fn( () => {
@@ -132,19 +177,27 @@ class InstancedPointsNodeMaterial extends NodeMaterial {
 
 		} )();
 
+		super.setup( builder );
+
 	}
 
+	/**
+	 * Whether alpha to coverage should be used or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get alphaToCoverage() {
 
-		return this.useAlphaToCoverage;
+		return this._useAlphaToCoverage;
 
 	}
 
 	set alphaToCoverage( value ) {
 
-		if ( this.useAlphaToCoverage !== value ) {
+		if ( this._useAlphaToCoverage !== value ) {
 
-			this.useAlphaToCoverage = value;
+			this._useAlphaToCoverage = value;
 			this.needsUpdate = true;
 
 		}
diff --git a/src/materials/nodes/Line2NodeMaterial.js b/src/materials/nodes/Line2NodeMaterial.js
index 5613913748d90b..7a2835020b2327 100644
--- a/src/materials/nodes/Line2NodeMaterial.js
+++ b/src/materials/nodes/Line2NodeMaterial.js
@@ -16,6 +16,12 @@ import { NoBlending } from '../../constants.js';
 
 const _defaultValues = /*@__PURE__*/ new LineDashedMaterial();
 
+/**
+ * This node material can be used to render lines with a size larger than one
+ * by representing them as instanced meshes.
+ *
+ * @augments NodeMaterial
+ */
 class Line2NodeMaterial extends NodeMaterial {
 
 	static get type() {
@@ -24,49 +30,120 @@ class Line2NodeMaterial extends NodeMaterial {
 
 	}
 
-	constructor( params = {} ) {
+	/**
+	 * Constructs a new node material for wide line rendering.
+	 *
+	 * @param {Object?} parameters - The configuration parameter.
+	 */
+	constructor( parameters = {} ) {
 
 		super();
 
-		this.lights = false;
+		/**
+		 * This flag can be used for type testing.
+		 *
+		 * @type {Boolean}
+		 * @readonly
+		 * @default true
+		 */
+		this.isLine2NodeMaterial = true;
 
 		this.setDefaultValues( _defaultValues );
 
-		this.useAlphaToCoverage = true;
-		this.useColor = params.vertexColors;
-		this.useDash = params.dashed;
-		this.useWorldUnits = false;
-
+		/**
+		 * Whether vertex colors should be used or not.
+		 *
+		 * @type {Boolean}
+		 * @default false
+		 */
+		this.useColor = parameters.vertexColors;
+
+		/**
+		 * The dash offset.
+		 *
+		 * @type {Number}
+		 * @default 0
+		 */
 		this.dashOffset = 0;
+
+		/**
+		 * The line width.
+		 *
+		 * @type {Number}
+		 * @default 0
+		 */
 		this.lineWidth = 1;
 
+		/**
+		 * Defines the lines color.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.lineColorNode = null;
 
+		/**
+		 * Defines the offset.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.offsetNode = null;
+
+		/**
+		 * Defines the dash scale.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.dashScaleNode = null;
+
+		/**
+		 * Defines the dash size.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.dashSizeNode = null;
+
+		/**
+		 * Defines the gap size.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.gapSizeNode = null;
 
+		/**
+		 * Blending is set to `NoBlending` since transparency
+		 * is not supported, yet.
+		 *
+		 * @type {Number}
+		 * @default 0
+		 */
 		this.blending = NoBlending;
 
-		this.setValues( params );
+		this._useDash = parameters.dashed;
+		this._useAlphaToCoverage = true;
+		this._useWorldUnits = false;
+
+		this.setValues( parameters );
 
 	}
 
+	/**
+	 * Setups the vertex and fragment stage of this node material.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	setup( builder ) {
 
-		this.setupShaders( builder );
-
-		super.setup( builder );
-
-	}
-
-	setupShaders( { renderer } ) {
+		const { renderer } = builder;
 
-		const useAlphaToCoverage = this.alphaToCoverage;
+		const useAlphaToCoverage = this._useAlphaToCoverage;
 		const useColor = this.useColor;
-		const useDash = this.dashed;
-		const useWorldUnits = this.worldUnits;
+		const useDash = this._useDash;
+		const useWorldUnits = this._useWorldUnits;
 
 		const trimSegment = Fn( ( { start, end } ) => {
 
@@ -394,56 +471,74 @@ class Line2NodeMaterial extends NodeMaterial {
 
 		}
 
-	}
+		super.setup( builder );
 
+	}
 
+	/**
+	 * Whether the lines should sized in world units or not.
+	 * When set to `false` the unit is pixel.
+	 *
+	 * @type {Boolean}
+	 * @default false
+	 */
 	get worldUnits() {
 
-		return this.useWorldUnits;
+		return this._useWorldUnits;
 
 	}
 
 	set worldUnits( value ) {
 
-		if ( this.useWorldUnits !== value ) {
+		if ( this._useWorldUnits !== value ) {
 
-			this.useWorldUnits = value;
+			this._useWorldUnits = value;
 			this.needsUpdate = true;
 
 		}
 
 	}
 
-
+	/**
+	 * Whether the lines should be dashed or not.
+	 *
+	 * @type {Boolean}
+	 * @default false
+	 */
 	get dashed() {
 
-		return this.useDash;
+		return this._useDash;
 
 	}
 
 	set dashed( value ) {
 
-		if ( this.useDash !== value ) {
+		if ( this._useDash !== value ) {
 
-			this.useDash = value;
+			this._useDash = value;
 			this.needsUpdate = true;
 
 		}
 
 	}
 
-
+	/**
+	 * Whether alpha to coverage should be used or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get alphaToCoverage() {
 
-		return this.useAlphaToCoverage;
+		return this._useAlphaToCoverage;
 
 	}
 
 	set alphaToCoverage( value ) {
 
-		if ( this.useAlphaToCoverage !== value ) {
+		if ( this._useAlphaToCoverage !== value ) {
 
-			this.useAlphaToCoverage = value;
+			this._useAlphaToCoverage = value;
 			this.needsUpdate = true;
 
 		}
diff --git a/src/materials/nodes/MeshPhysicalNodeMaterial.js b/src/materials/nodes/MeshPhysicalNodeMaterial.js
index b06062ae5b0afd..e480b338787e19 100644
--- a/src/materials/nodes/MeshPhysicalNodeMaterial.js
+++ b/src/materials/nodes/MeshPhysicalNodeMaterial.js
@@ -11,6 +11,11 @@ import { MeshPhysicalMaterial } from '../MeshPhysicalMaterial.js';
 
 const _defaultValues = /*@__PURE__*/ new MeshPhysicalMaterial();
 
+/**
+ * Node material version of `MeshPhysicalMaterial`.
+ *
+ * @augments MeshStandardNodeMaterial
+ */
 class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {
 
 	static get type() {
@@ -19,33 +24,243 @@ class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {
 
 	}
 
+	/**
+	 * Constructs a new mesh physical node material.
+	 *
+	 * @param {Object?} parameters - The configuration parameter.
+	 */
 	constructor( parameters ) {
 
 		super();
 
+		/**
+		 * This flag can be used for type testing.
+		 *
+		 * @type {Boolean}
+		 * @readonly
+		 * @default true
+		 */
 		this.isMeshPhysicalNodeMaterial = true;
 
+		/**
+		 * The clearcoat of physical materials is by default inferred from the `clearcoat`
+		 * and `clearcoatMap` properties. This node property allows to overwrite the default
+		 * and define the clearcoat with a node instead.
+		 *
+		 * If you don't want to overwrite the clearcoat but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialClearcoat}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.clearcoatNode = null;
+
+		/**
+		 * The clearcoat roughness of physical materials is by default inferred from the `clearcoatRoughness`
+		 * and `clearcoatRoughnessMap` properties. This node property allows to overwrite the default
+		 * and define the clearcoat roughness with a node instead.
+		 *
+		 * If you don't want to overwrite the clearcoat roughness but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialClearcoatRoughness}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.clearcoatRoughnessNode = null;
+
+		/**
+		 * The clearcoat normal of physical materials is by default inferred from the `clearcoatNormalMap`
+		 * property. This node property allows to overwrite the default
+		 * and define the clearcoat normal with a node instead.
+		 *
+		 * If you don't want to overwrite the clearcoat normal but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialClearcoatNormal}.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.clearcoatNormalNode = null;
 
+		/**
+		 * The sheen of physical materials is by default inferred from the `sheen`, `sheenColor`
+		 * and `sheenColorMap` properties. This node property allows to overwrite the default
+		 * and define the sheen with a node instead.
+		 *
+		 * If you don't want to overwrite the sheen but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialSheen}.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.sheenNode = null;
+
+		/**
+		 * The sheen roughness of physical materials is by default inferred from the `sheenRoughness` and
+		 * `sheenRoughnessMap` properties. This node property allows to overwrite the default
+		 * and define the sheen roughness with a node instead.
+		 *
+		 * If you don't want to overwrite the sheen roughness but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialSheenRoughness}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.sheenRoughnessNode = null;
 
+		/**
+		 * The iridescence of physical materials is by default inferred from the `iridescence`
+		 * property. This node property allows to overwrite the default
+		 * and define the iridescence with a node instead.
+		 *
+		 * If you don't want to overwrite the iridescence but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialIridescence}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.iridescenceNode = null;
+
+		/**
+		 * The iridescence IOR of physical materials is by default inferred from the `iridescenceIOR`
+		 * property. This node property allows to overwrite the default
+		 * and define the iridescence IOR with a node instead.
+		 *
+		 * If you don't want to overwrite the iridescence IOR but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialIridescenceIOR}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.iridescenceIORNode = null;
+
+		/**
+		 * The iridescence thickness of physical materials is by default inferred from the `iridescenceThicknessRange`
+		 * and `iridescenceThicknessMap` properties. This node property allows to overwrite the default
+		 * and define the iridescence thickness with a node instead.
+		 *
+		 * If you don't want to overwrite the iridescence thickness but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialIridescenceThickness}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.iridescenceThicknessNode = null;
 
+		/**
+		 * The specular intensity of physical materials is by default inferred from the `specularIntensity`
+		 * and `specularIntensityMap` properties. This node property allows to overwrite the default
+		 * and define the specular intensity with a node instead.
+		 *
+		 * If you don't want to overwrite the specular intensity but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialSpecularIntensity}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.specularIntensityNode = null;
+
+		/**
+		 * The specular color of physical materials is by default inferred from the `specularColor`
+		 * and `specularColorMap` properties. This node property allows to overwrite the default
+		 * and define the specular color with a node instead.
+		 *
+		 * If you don't want to overwrite the specular color but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialSpecularColor}.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.specularColorNode = null;
 
+		/**
+		 * The ior of physical materials is by default inferred from the `ior`
+		 * property. This node property allows to overwrite the default
+		 * and define the ior with a node instead.
+		 *
+		 * If you don't want to overwrite the ior but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialIOR}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.iorNode = null;
+
+		/**
+		 * The transmission of physical materials is by default inferred from the `transmission` and
+		 * `transmissionMap` properties. This node property allows to overwrite the default
+		 * and define the transmission with a node instead.
+		 *
+		 * If you don't want to overwrite the transmission but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialTransmission}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.transmissionNode = null;
+
+		/**
+		 * The thickness of physical materials is by default inferred from the `thickness` and
+		 * `thicknessMap` properties. This node property allows to overwrite the default
+		 * and define the thickness with a node instead.
+		 *
+		 * If you don't want to overwrite the thickness but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialThickness}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.thicknessNode = null;
+
+		/**
+		 * The attenuation distance of physical materials is by default inferred from the
+		 * `attenuationDistance` property. This node property allows to overwrite the default
+		 * and define the attenuation distance with a node instead.
+		 *
+		 * If you don't want to overwrite the attenuation distance but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialAttenuationDistance}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.attenuationDistanceNode = null;
+
+		/**
+		 * The attenuation color of physical materials is by default inferred from the
+		 * `attenuationColor` property. This node property allows to overwrite the default
+		 * and define the attenuation color with a node instead.
+		 *
+		 * If you don't want to overwrite the attenuation color but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialAttenuationColor}.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.attenuationColorNode = null;
+
+		/**
+		 * The dispersion of physical materials is by default inferred from the
+		 * `dispersion` property. This node property allows to overwrite the default
+		 * and define the dispersion with a node instead.
+		 *
+		 * If you don't want to overwrite the dispersion but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialDispersion}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.dispersionNode = null;
 
+		/**
+		 * The anisotropy of physical materials is by default inferred from the
+		 * `anisotropy` property. This node property allows to overwrite the default
+		 * and define the anisotropy with a node instead.
+		 *
+		 * If you don't want to overwrite the anisotropy but modify the existing
+		 * value instead, use {@link module:MaterialNode.materialAnisotropy}.
+		 *
+		 * @type {Node<float>?}
+		 * @default null
+		 */
 		this.anisotropyNode = null;
 
 		this.setDefaultValues( _defaultValues );
@@ -54,42 +269,81 @@ class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {
 
 	}
 
+	/**
+	 * Whether the lighting model should use clearcoat or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useClearcoat() {
 
 		return this.clearcoat > 0 || this.clearcoatNode !== null;
 
 	}
 
+	/**
+	 * Whether the lighting model should use iridescence or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useIridescence() {
 
 		return this.iridescence > 0 || this.iridescenceNode !== null;
 
 	}
 
+	/**
+	 * Whether the lighting model should use sheen or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useSheen() {
 
 		return this.sheen > 0 || this.sheenNode !== null;
 
 	}
 
+	/**
+	 * Whether the lighting model should use anisotropy or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useAnisotropy() {
 
 		return this.anisotropy > 0 || this.anisotropyNode !== null;
 
 	}
 
+	/**
+	 * Whether the lighting model should use transmission or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useTransmission() {
 
 		return this.transmission > 0 || this.transmissionNode !== null;
 
 	}
 
+	/**
+	 * Whether the lighting model should use dispersion or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useDispersion() {
 
 		return this.dispersion > 0 || this.dispersionNode !== null;
 
 	}
 
+	/**
+	 * Setups the specular related node variables.
+	 */
 	setupSpecular() {
 
 		const iorNode = this.iorNode ? float( this.iorNode ) : materialIOR;
@@ -100,12 +354,22 @@ class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {
 
 	}
 
+	/**
+	 * Setups the lighting model.
+	 *
+	 * @return {PhysicalLightingModel} The lighting model.
+	 */
 	setupLightingModel( /*builder*/ ) {
 
 		return new PhysicalLightingModel( this.useClearcoat, this.useSheen, this.useIridescence, this.useAnisotropy, this.useTransmission, this.useDispersion );
 
 	}
 
+	/**
+	 * Setups the physical specific node variables.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	setupVariants( builder ) {
 
 		super.setupVariants( builder );
@@ -201,6 +465,11 @@ class MeshPhysicalNodeMaterial extends MeshStandardNodeMaterial {
 
 	}
 
+	/**
+	 * Setups the clearcoat normal node.
+	 *
+	 * @return {Node<vec3>} The clearcoat noraml.
+	 */
 	setupClearcoatNormal() {
 
 		return this.clearcoatNormalNode ? vec3( this.clearcoatNormalNode ) : materialClearcoatNormal;
diff --git a/src/materials/nodes/MeshSSSNodeMaterial.js b/src/materials/nodes/MeshSSSNodeMaterial.js
index 064d9e4b896fe3..3c5736f48a173d 100644
--- a/src/materials/nodes/MeshSSSNodeMaterial.js
+++ b/src/materials/nodes/MeshSSSNodeMaterial.js
@@ -4,16 +4,49 @@ import { transformedNormalView } from '../../nodes/accessors/Normal.js';
 import { positionViewDirection } from '../../nodes/accessors/Position.js';
 import { float, vec3 } from '../../nodes/tsl/TSLBase.js';
 
-class SSSLightingModel extends PhysicalLightingModel {
-
-	constructor( useClearcoat, useSheen, useIridescence, useSSS ) {
+/** @module MeshSSSNodeMaterial **/
 
-		super( useClearcoat, useSheen, useIridescence );
+/**
+ * Represents the lighting model for {@link MeshSSSNodeMaterial}.
+ *
+ * @augments PhysicalLightingModel
+ */
+class SSSLightingModel extends PhysicalLightingModel {
 
-		this.useSSS = useSSS;
+	/**
+	 * Constructs a new physical lighting model.
+	 *
+	 * @param {Boolean} [clearcoat=false] - Whether clearcoat is supported or not.
+	 * @param {Boolean} [sheen=false] - Whether sheen is supported or not.
+	 * @param {Boolean} [iridescence=false] - Whether iridescence is supported or not.
+	 * @param {Boolean} [anisotropy=false] - Whether anisotropy is supported or not.
+	 * @param {Boolean} [transmission=false] - Whether transmission is supported or not.
+	 * @param {Boolean} [dispersion=false] - Whether dispersion is supported or not.
+	 * @param {Boolean} [sss=false] - Whether SSS is supported or not.
+	 */
+	constructor( clearcoat = false, sheen = false, iridescence = false, anisotropy = false, transmission = false, dispersion = false, sss = false ) {
+
+		super( clearcoat, sheen, iridescence, anisotropy, transmission, dispersion );
+
+		/**
+		 * Whether the lighting model should use SSS or not.
+		 *
+		 * @type {Boolean}
+		 * @default false
+		 */
+		this.useSSS = sss;
 
 	}
 
+	/**
+	 * Extends the default implementation with a SSS term.
+	 *
+	 * Reference: [Approximating Translucency for a Fast, Cheap and Convincing Subsurface Scattering Look]{@link https://colinbarrebrisebois.com/2011/03/07/gdc-2011-approximating-translucency-for-a-fast-cheap-and-convincing-subsurface-scattering-look/}
+	 *
+	 * @param {Object} input - The input data.
+	 * @param {StackNode} stack - The current stack.
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	direct( { lightDirection, lightColor, reflectedLight }, stack, builder ) {
 
 		if ( this.useSSS === true ) {
@@ -36,6 +69,12 @@ class SSSLightingModel extends PhysicalLightingModel {
 
 }
 
+/**
+ * This node material is an experimental extension of {@link MeshPhysicalNodeMaterial}
+ * that implements a Subsurface scattering (SSS) term.
+ *
+ * @augments MeshPhysicalNodeMaterial
+ */
 class MeshSSSNodeMaterial extends MeshPhysicalNodeMaterial {
 
 	static get type() {
@@ -44,28 +83,80 @@ class MeshSSSNodeMaterial extends MeshPhysicalNodeMaterial {
 
 	}
 
+	/**
+	 * Constructs a new mesh SSS node material.
+	 *
+	 * @param {Object?} parameters - The configuration parameter.
+	 */
 	constructor( parameters ) {
 
 		super( parameters );
 
+		/**
+		 * Represents the thickness color.
+		 *
+		 * @type {Node<vec3>?}
+		 * @default null
+		 */
 		this.thicknessColorNode = null;
+
+		/**
+		 * Represents the distortion factor.
+		 *
+		 * @type {Node<float>?}
+		 */
 		this.thicknessDistortionNode = float( 0.1 );
+
+		/**
+		 * Represents the thickness ambient factor.
+		 *
+		 * @type {Node<float>?}
+		 */
 		this.thicknessAmbientNode = float( 0.0 );
+
+		/**
+		 * Represents the thickness attenuation.
+		 *
+		 * @type {Node<float>?}
+		 */
 		this.thicknessAttenuationNode = float( .1 );
+
+		/**
+		 * Represents the thickness power.
+		 *
+		 * @type {Node<float>?}
+		 */
 		this.thicknessPowerNode = float( 2.0 );
+
+		/**
+		 * Represents the thickness scale.
+		 *
+		 * @type {Node<float>?}
+		 */
 		this.thicknessScaleNode = float( 10.0 );
 
 	}
 
+	/**
+	 * Whether the lighting model should use SSS or not.
+	 *
+	 * @type {Boolean}
+	 * @default true
+	 */
 	get useSSS() {
 
 		return this.thicknessColorNode !== null;
 
 	}
 
+	/**
+	 * Setups the lighting model.
+	 *
+	 * @return {SSSLightingModel} The lighting model.
+	 */
 	setupLightingModel( /*builder*/ ) {
 
-		return new SSSLightingModel( this.useClearcoat, this.useSheen, this.useIridescence, this.useSSS );
+		return new SSSLightingModel( this.useClearcoat, this.useSheen, this.useIridescence, this.useAnisotropy, this.useTransmission, this.useDispersion, this.useSSS );
 
 	}
 
diff --git a/src/materials/nodes/NodeMaterial.js b/src/materials/nodes/NodeMaterial.js
index 4063f968842dd3..f30a2cdae55c54 100644
--- a/src/materials/nodes/NodeMaterial.js
+++ b/src/materials/nodes/NodeMaterial.js
@@ -400,7 +400,7 @@ class NodeMaterial extends Material {
 	}
 
 	/**
-	 * Setups the vertex and fragment stahge of this node material.
+	 * Setups the vertex and fragment stage of this node material.
 	 *
 	 * @param {NodeBuilder} builder - The current node builder.
 	 */
diff --git a/src/materials/nodes/VolumeNodeMaterial.js b/src/materials/nodes/VolumeNodeMaterial.js
index 39940174305e48..0927a2ec10d4ef 100644
--- a/src/materials/nodes/VolumeNodeMaterial.js
+++ b/src/materials/nodes/VolumeNodeMaterial.js
@@ -8,7 +8,14 @@ import { Fn, varying, float, vec2, vec3, vec4 } from '../../nodes/tsl/TSLBase.js
 import { min, max } from '../../nodes/math/MathNode.js';
 import { Loop, Break } from '../../nodes/utils/LoopNode.js';
 import { texture3D } from '../../nodes/accessors/Texture3DNode.js';
-
+import { Color } from '../../math/Color.js';
+
+/**
+ * Node material intended for volume rendering. The volumetic data are
+ * defined with an instance of {@link Data3DTexture}.
+ *
+ * @augments NodeMaterial
+ */
 class VolumeNodeMaterial extends NodeMaterial {
 
 	static get type() {
@@ -17,18 +24,85 @@ class VolumeNodeMaterial extends NodeMaterial {
 
 	}
 
-	constructor( params = {} ) {
+	/**
+	 * Constructs a new volume node material.
+	 *
+	 * @param {Object?} parameters - The configuration parameter.
+	 */
+	constructor( parameters ) {
 
 		super();
 
-		this.lights = false;
+		/**
+		 * This flag can be used for type testing.
+		 *
+		 * @type {Boolean}
+		 * @readonly
+		 * @default true
+		 */
 		this.isVolumeNodeMaterial = true;
+
+		/**
+		 * The base color of the volume.
+		 *
+		 * @type {Color}
+		 * @default 100
+		 */
+		this.base = new Color( 0xffffff );
+
+		/**
+		 * A 3D data texture holding the volumetric data.
+		 *
+		 * @type {Data3DTexture?}
+		 * @default null
+		 */
+		this.map = null;
+
+		/**
+		 * This number of samples for each ray that hits the mesh's surface
+		 * and travels through the volume.
+		 *
+		 * @type {Number}
+		 * @default 100
+		 */
+		this.steps = 100;
+
+		/**
+		 * Callback for {@link VolumeNodeMaterial#testNode}.
+		 *
+		 * @callback testNodeCallback
+		 * @param {Data3DTexture<float>} map - The 3D texture.
+		 * @param {Node<float>} mapValue - The sampled value inside the volume.
+		 * @param {Node<vec3>} probe - The probe which is the entry point of the ray on the mesh's surface.
+		 * @param {Node<vec4>} finalColor - The final color.
+		 */
+
+		/**
+		 * The volume rendering of this material works by shooting rays
+		 * from the camera position through each fragment of the mesh's
+		 * surface and sample the inner volume in a raymarching fashion
+		 * mutiple times.
+		 *
+		 * This node can be used to assign a callback function of type `Fn`
+		 * that will be exexuted per sample. The callback receives the
+		 * texture, the sampled texture value as well as position on the surface
+		 * where the rays enters the volume. The last parameter is a color
+		 * that allows the callback to determine the final color.
+		 *
+		 * @type {testNodeCallback?}
+		 * @default null
+		 */
 		this.testNode = null;
 
-		this.setValues( params );
+		this.setValues( parameters );
 
 	}
 
+	/**
+	 * Setups the vertex and fragment stage of this node material.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 */
 	setup( builder ) {
 
 		const map = texture3D( this.map, null, 0 );
diff --git a/src/materials/nodes/manager/NodeMaterialObserver.js b/src/materials/nodes/manager/NodeMaterialObserver.js
index d7865a70fb6bf7..6a193f594093fd 100644
--- a/src/materials/nodes/manager/NodeMaterialObserver.js
+++ b/src/materials/nodes/manager/NodeMaterialObserver.js
@@ -51,18 +51,65 @@ const refreshUniforms = [
 	'transmissionMap'
 ];
 
+/**
+ * This class is used by {@link WebGPURenderer} as management component.
+ * It's primary purpose is to determine whether render objects require a
+ * refresh right before they are going to be rendered or not.
+ */
 class NodeMaterialObserver {
 
+	/**
+	 * Constructs a new node material observer.
+	 *
+	 * @param {NodeBuilder} builder - The node builder.
+	 */
 	constructor( builder ) {
 
+		/**
+		 * A node material can be used by more than one render object so the
+		 * monitor must maintain a list of render objects.
+		 *
+		 * @type {WeakMap<RenderObject,Object>}
+		 */
 		this.renderObjects = new WeakMap();
+
+		/**
+		 * Whether the material uses node objects or not.
+		 *
+		 * @type {Boolean}
+		 */
 		this.hasNode = this.containsNode( builder );
+
+		/**
+		 * Whether the node builder's 3D object is animated or not.
+		 *
+		 * @type {Boolean}
+		 */
 		this.hasAnimation = builder.object.isSkinnedMesh === true;
+
+		/**
+		 * A list of all possible material uniforms
+		 *
+		 * @type {Array<String>}
+		 */
 		this.refreshUniforms = refreshUniforms;
+
+		/**
+		 * Holds the current render ID from the node frame.
+		 *
+		 * @type {Number}
+		 * @default 0
+		 */
 		this.renderId = 0;
 
 	}
 
+	/**
+	 * Returns `true` if the given render object is verified for the first time of this observer.
+	 *
+	 * @param {RenderObject} renderObject - The render object.
+	 * @return {Boolean} Whether the given render object is verified for the first time of this observer.
+	 */
 	firstInitialization( renderObject ) {
 
 		const hasInitialized = this.renderObjects.has( renderObject );
@@ -79,6 +126,12 @@ class NodeMaterialObserver {
 
 	}
 
+	/**
+	 * Returns monitoring data for the given render object.
+	 *
+	 * @param {RenderObject} renderObject - The render object.
+	 * @return {Object} The monitoring data.
+	 */
 	getRenderObjectData( renderObject ) {
 
 		let data = this.renderObjects.get( renderObject );
@@ -132,6 +185,13 @@ class NodeMaterialObserver {
 
 	}
 
+	/**
+	 * Returns an attribute data structure holding the attributes versions for
+	 * monitoring.
+	 *
+	 * @param {Object} attributes - The geometry attributes.
+	 * @return {Object} An object for monitoring the versions of attributes.
+	 */
 	getAttributesData( attributes ) {
 
 		const attributesData = {};
@@ -150,6 +210,13 @@ class NodeMaterialObserver {
 
 	}
 
+	/**
+	 * Returns `true` if the node builder's material uses
+	 * node properties.
+	 *
+	 * @param {NodeBuilder} builder - The current node builder.
+	 * @return {Boolean} Whether the node builder's material uses node properties or not.
+	 */
 	containsNode( builder ) {
 
 		const material = builder.material;
@@ -168,6 +235,13 @@ class NodeMaterialObserver {
 
 	}
 
+	/**
+	 * Returns a material data structure holding the material property values for
+	 * monitoring.
+	 *
+	 * @param {Material} material - The material.
+	 * @return {Object} An object for monitoring material properties.
+	 */
 	getMaterialData( material ) {
 
 		const data = {};
@@ -202,6 +276,12 @@ class NodeMaterialObserver {
 
 	}
 
+	/**
+	 * Returns `true` if the given render object has not changed its state.
+	 *
+	 * @param {RenderObject} renderObject - The render object.
+	 * @return {Boolean} Whether the given render object has changed its state or not.
+	 */
 	equals( renderObject ) {
 
 		const { object, material, geometry } = renderObject;
@@ -382,6 +462,13 @@ class NodeMaterialObserver {
 
 	}
 
+	/**
+	 * Checks if the given render object requires a refresh.
+	 *
+	 * @param {RenderObject} renderObject - The render object.
+	 * @param {NodeFrame} nodeFrame - The current node frame.
+	 * @return {Boolean} Whether the given render object requires a refresh or not.
+	 */
 	needsRefresh( renderObject, nodeFrame ) {
 
 		if ( this.hasNode || this.hasAnimation || this.firstInitialization( renderObject ) )
diff --git a/src/nodes/accessors/MaterialNode.js b/src/nodes/accessors/MaterialNode.js
index a7a880911f57ec..8f8397d37aaf1f 100644
--- a/src/nodes/accessors/MaterialNode.js
+++ b/src/nodes/accessors/MaterialNode.js
@@ -161,15 +161,15 @@ class MaterialNode extends Node {
 
 		} else if ( scope === MaterialNode.SPECULAR_INTENSITY ) {
 
-			const specularIntensity = this.getFloat( scope );
+			const specularIntensityNode = this.getFloat( scope );
 
-			if ( material.specularMap ) {
+			if ( material.specularIntensityMap && material.specularIntensityMap.isTexture === true ) {
 
-				node = specularIntensity.mul( this.getTexture( scope ).a );
+				node = specularIntensityNode.mul( this.getTexture( scope ).a );
 
 			} else {
 
-				node = specularIntensity;
+				node = specularIntensityNode;
 
 			}
 
@@ -499,7 +499,7 @@ export const materialSpecularIntensity = /*@__PURE__*/ nodeImmutable( MaterialNo
  * TSL object that represents the specular color of the current material.
  * The value is composed via `specularColor` * `specularMap.rgb`.
  *
- * @type {Node<float>}
+ * @type {Node<vec3>}
  */
 export const materialSpecularColor = /*@__PURE__*/ nodeImmutable( MaterialNode, MaterialNode.SPECULAR_COLOR );
 
@@ -544,7 +544,7 @@ export const materialNormal = /*@__PURE__*/ nodeImmutable( MaterialNode, Materia
 
 /**
  * TSL object that represents the clearcoat of the current material.
- * The value is composed via `clearcoat` * `clearcoat.r`
+ * The value is composed via `clearcoat` * `clearcoatMap.r`
  *
  * @type {Node<float>}
  */