diff --git a/examples/jsm/shaders/VolumeShader.js b/examples/jsm/shaders/VolumeShader.js
index cf6a710fa1a41c..48ae0ac8007f39 100644
--- a/examples/jsm/shaders/VolumeShader.js
+++ b/examples/jsm/shaders/VolumeShader.js
@@ -134,6 +134,8 @@ const VolumeRenderShader1 = {
 
 				vec4 apply_colormap(float val) {
 						val = (val - u_clim[0]) / (u_clim[1] - u_clim[0]);
+						float n = float(textureSize(u_cmdata, 0).x); // see #33842
+						val = (val * (n - 1.0) + 0.5) / n;
 						return texture2D(u_cmdata, vec2(val, 0.5));
 				}
 
diff --git a/src/nodes/accessors/Batch.js b/src/nodes/accessors/Batch.js
index 20a9d48a3c94fe..ab62e98dadab25 100644
--- a/src/nodes/accessors/Batch.js
+++ b/src/nodes/accessors/Batch.js
@@ -13,7 +13,7 @@ import { varyingProperty } from '../core/PropertyNode.js';
  *
  * @param {Node<texture>} colorsTexture - The colors texture.
  * @param {Node<int>} id - The instance or batch ID.
- * @returns {Node<vec3>} The retrieved color.
+ * @returns {Node<vec4>} The retrieved color.
  */
 const getBatchingColor = /*@__PURE__*/ Fn( ( [ colorsTexture, id ] ) => {
 
@@ -21,7 +21,7 @@ const getBatchingColor = /*@__PURE__*/ Fn( ( [ colorsTexture, id ] ) => {
 	const j = int( id );
 	const x = j.mod( size ).toConst();
 	const y = j.div( size ).toConst();
-	return textureLoad( colorsTexture, ivec2( x, y ) ).rgb;
+	return textureLoad( colorsTexture, ivec2( x, y ) );
 
 } );
 
@@ -44,9 +44,9 @@ const getIndirectIndex = /*@__PURE__*/ Fn( ( [ indirectTexture, id ] ) => {
 /**
  * TSL object representing a varying property for the batching color vector.
  *
- * @type {VaryingNode<vec3>}
+ * @type {VaryingNode<vec4>}
  */
-export const batchColor = /*@__PURE__*/ varyingProperty( 'vec3', 'vBatchColor' );
+export const batchColor = /*@__PURE__*/ varyingProperty( 'vec4', 'vBatchColor' );
 
 /**
  * TSL function representing the vertex shader batching setup.