WebGPURenderer: Introduce `renderer.highPrecision` (#30970)

* Rename `renderer.nodes` -> ``renderer.overrideNodes`

* Add `renderer.highPrecision`

src/materials/nodes/manager/NodeMaterialObserver.js

@@ -243,7 +243,7 @@ class NodeMaterialObserver {
 
 		}
 
-		if ( builder.renderer.nodes.modelViewMatrix !== null || builder.renderer.nodes.modelNormalViewMatrix !== null )
+		if ( builder.renderer.overrideNodes.modelViewMatrix !== null || builder.renderer.overrideNodes.modelNormalViewMatrix !== null )
 			return true;
 
 		return false;

src/nodes/accessors/ModelNode.js

@@ -123,7 +123,7 @@ export const modelWorldMatrixInverse = /*@__PURE__*/ uniform( new Matrix4() ).on
  */
 export const modelViewMatrix = /*@__PURE__*/ ( Fn( ( builder ) => {
 
-	return builder.renderer.nodes.modelViewMatrix || mediumpModelViewMatrix;
+	return builder.renderer.overrideNodes.modelViewMatrix || mediumpModelViewMatrix;
 
 } ).once() )().toVar( 'modelViewMatrix' );
 

src/nodes/accessors/Normal.js

@@ -159,7 +159,7 @@ export const transformNormal = /*@__PURE__*/ Fn( ( [ normal, matrix = modelWorld
  */
 export const transformNormalToView = /*@__PURE__*/ Fn( ( [ normal ], builder ) => {
 
-	const modelNormalViewMatrix = builder.renderer.nodes.modelNormalViewMatrix;
+	const modelNormalViewMatrix = builder.renderer.overrideNodes.modelNormalViewMatrix;
 
 	if ( modelNormalViewMatrix !== null ) {
 

src/renderers/common/Renderer.js

@@ -29,6 +29,8 @@ import { Vector4 } from '../../math/Vector4.js';
 import { RenderTarget } from '../../core/RenderTarget.js';
 import { DoubleSide, BackSide, FrontSide, SRGBColorSpace, NoToneMapping, LinearFilter, LinearSRGBColorSpace, HalfFloatType, RGBAFormat, PCFShadowMap } from '../../constants.js';
 
+import { highpModelNormalViewMatrix, highpModelViewMatrix } from '../../nodes/accessors/ModelNode.js';
+
 const _scene = /*@__PURE__*/ new Scene();
 const _drawingBufferSize = /*@__PURE__*/ new Vector2();
 const _screen = /*@__PURE__*/ new Vector4();
@@ -230,7 +232,15 @@ class Renderer {
 		 */
 		this.info = new Info();
 
-		this.nodes = {
+		/**
+		 * Stores override nodes for specific transformations or calculations.
+		 * These nodes can be used to replace default behavior in the rendering pipeline.
+		 *
+		 * @type {Object}
+		 * @property {?Node} modelViewMatrix - An override node for the model-view matrix.
+		 * @property {?Node} modelNormalViewMatrix - An override node for the model normal view matrix.
+		 */
+		this.overrideNodes = {
 			modelViewMatrix: null,
 			modelNormalViewMatrix: null
 		};
@@ -982,6 +992,43 @@ class Renderer {
 
 	}
 
+	/**
+	 * Enables or disables high precision for model-view and normal-view matrices.
+	 * When enabled, will use CPU 64-bit precision for higher precision instead of GPU 32-bit for higher performance.
+	 *
+	 * NOTE: 64-bit precision is not compatible with `InstancedMesh` and `SkinnedMesh`.
+	 *
+	 * @param {boolean} value - Whether to enable or disable high precision.
+	 * @type {boolean}
+	 */
+	set highPrecision( value ) {
+
+		if ( value === true ) {
+
+			this.overrideNodes.modelViewMatrix = highpModelViewMatrix;
+			this.overrideNodes.modelNormalViewMatrix = highpModelNormalViewMatrix;
+
+		} else if ( this.highPrecision ) {
+
+			this.overrideNodes.modelViewMatrix = null;
+			this.overrideNodes.modelNormalViewMatrix = null;
+
+		}
+
+	}
+
+	/**
+	 * Returns whether high precision is enabled or not.
+	 *
+	 * @return {boolean} Whether high precision is enabled or not.
+	 * @type {boolean}
+	 */
+	get highPrecision() {
+
+		return this.overrideNodes.modelViewMatrix === highpModelViewMatrix && this.overrideNodes.modelNormalViewMatrix === highpModelNormalViewMatrix;
+
+	}
+
 	/**
 	 * Sets the given MRT configuration.
 	 *