diff --git a/Apps/Sandcastle/gallery/development/VolumeCloud.html b/Apps/Sandcastle/gallery/VolumeCloud.html
similarity index 99%
rename from Apps/Sandcastle/gallery/development/VolumeCloud.html
rename to Apps/Sandcastle/gallery/VolumeCloud.html
index c9b61289edb1..f7f3b632d3cc 100644
--- a/Apps/Sandcastle/gallery/development/VolumeCloud.html
+++ b/Apps/Sandcastle/gallery/VolumeCloud.html
@@ -11,7 +11,7 @@
       name="description"
       content="Rendering Volume Cloud with Texture3D and Custom GLSL. Transplanted from Three.js"
     />
-    <meta name="cesium-sandcastle-labels" content="Development" />
+    <meta name="cesium-sandcastle-labels" content="Tutorials,Showcases" />
     <title>Cesium Demo</title>
     <script type="text/javascript" src="../Sandcastle-header.js"></script>
     <script
diff --git a/Apps/Sandcastle/gallery/development/VolumeCloud.jpg b/Apps/Sandcastle/gallery/VolumeCloud.jpg
similarity index 100%
rename from Apps/Sandcastle/gallery/development/VolumeCloud.jpg
rename to Apps/Sandcastle/gallery/VolumeCloud.jpg
diff --git a/CHANGES.md b/CHANGES.md
index 5746fc0283a8..e36b11eaa5ea 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -20,6 +20,7 @@
 #### Additions :tada:
 
 - Expand the CustomShader Sample to support real-time modification of CustomShader. [#12702](https://github.com/CesiumGS/cesium/pull/12702)
+- Add wrapR property to Sampler and Texture3D, to support the newly added third dimension wrap.[#12701](https://github.com/CesiumGS/cesium/pull/12701)
 
 ## 1.131 - 2025-07-01
 
diff --git a/packages/engine/Source/Renderer/Sampler.js b/packages/engine/Source/Renderer/Sampler.js
index e5d2ab9295a4..f608ca8253a4 100644
--- a/packages/engine/Source/Renderer/Sampler.js
+++ b/packages/engine/Source/Renderer/Sampler.js
@@ -13,6 +13,7 @@ function Sampler(options) {
   options = options ?? Frozen.EMPTY_OBJECT;
 
   const {
+    wrapR = TextureWrap.CLAMP_TO_EDGE,
     wrapS = TextureWrap.CLAMP_TO_EDGE,
     wrapT = TextureWrap.CLAMP_TO_EDGE,
     minificationFilter = TextureMinificationFilter.LINEAR,
@@ -21,6 +22,10 @@ function Sampler(options) {
   } = options;
 
   //>>includeStart('debug', pragmas.debug);
+  if (!TextureWrap.validate(wrapR)) {
+    throw new DeveloperError("Invalid sampler.wrapR.");
+  }
+
   if (!TextureWrap.validate(wrapS)) {
     throw new DeveloperError("Invalid sampler.wrapS.");
   }
@@ -44,6 +49,7 @@ function Sampler(options) {
   );
   //>>includeEnd('debug');
 
+  this._wrapR = wrapR;
   this._wrapS = wrapS;
   this._wrapT = wrapT;
   this._minificationFilter = minificationFilter;
@@ -52,6 +58,11 @@ function Sampler(options) {
 }
 
 Object.defineProperties(Sampler.prototype, {
+  wrapR: {
+    get: function () {
+      return this._wrapR;
+    },
+  },
   wrapS: {
     get: function () {
       return this._wrapS;
@@ -84,6 +95,7 @@ Sampler.equals = function (left, right) {
     left === right ||
     (defined(left) &&
       defined(right) &&
+      left._wrapR === right._wrapR &&
       left._wrapS === right._wrapS &&
       left._wrapT === right._wrapT &&
       left._minificationFilter === right._minificationFilter &&
@@ -94,6 +106,7 @@ Sampler.equals = function (left, right) {
 
 Sampler.NEAREST = Object.freeze(
   new Sampler({
+    wrapR: TextureWrap.CLAMP_TO_EDGE,
     wrapS: TextureWrap.CLAMP_TO_EDGE,
     wrapT: TextureWrap.CLAMP_TO_EDGE,
     minificationFilter: TextureMinificationFilter.NEAREST,
diff --git a/packages/engine/Source/Renderer/Texture3D.js b/packages/engine/Source/Renderer/Texture3D.js
index c44c2cd434a9..9e6813fa1f85 100644
--- a/packages/engine/Source/Renderer/Texture3D.js
+++ b/packages/engine/Source/Renderer/Texture3D.js
@@ -13,21 +13,30 @@ import Sampler from "./Sampler.js";
 import TextureMagnificationFilter from "./TextureMagnificationFilter.js";
 import TextureMinificationFilter from "./TextureMinificationFilter.js";
 
+/**
+ * @typedef {object} Texture3D.Source
+ * @property {number} width The width (in pixels) of the 3D texture source data.
+ * @property {number} height The height (in pixels) of the 3D texture source data.
+ * @property {number} depth The depth (in pixels) of the 3D texture source data.
+ * @property {TypedArray|DataView} arrayBufferView The source data for a 3D texture. The type of each element needs to match the pixelDatatype.
+ * @property {TypedArray|DataView} [mipLevels] An array of mip level data. Each element in the array should be a TypedArray or DataView that matches the pixelDatatype.
+ */
+
 /**
  * @typedef {object} Texture3D.ConstructorOptions
  *
  * @property {Context} context
- * @property {object} [source] The source for texel values to be loaded into the texture3D.
+ * @property {Texture3D.Source} [source] The source for texel values to be loaded into the 3D texture.
  * @property {PixelFormat} [pixelFormat=PixelFormat.RGBA] The format of each pixel, i.e., the number of components it has and what they represent.
  * @property {PixelDatatype} [pixelDatatype=PixelDatatype.UNSIGNED_BYTE] The data type of each pixel.
  * @property {boolean} [flipY=true] If true, the source values will be read as if the y-axis is inverted (y=0 at the top).
  * @property {boolean} [skipColorSpaceConversion=false] If true, color space conversions will be skipped when reading the texel values.
- * @property {Sampler} [sampler] Information about how to sample the texture3D.
- * @property {number} [width] The pixel width of the texture3D. If not supplied, must be available from the source.
- * @property {number} [height] The pixel height of the texture3D. If not supplied, must be available from the source.
- * @property {number} [depth] The pixel depth of the texture3D. If not supplied, must be available from the source.
+ * @property {Sampler} [sampler] Information about how to sample the 3D texture.
+ * @property {number} [width] The width (in pixels) of the 3D texture. If not supplied, must be available from the source.
+ * @property {number} [height] The height (in pixels) of the 3D texture. If not supplied, must be available from the source.
+ * @property {number} [depth] The depth (in pixels) of the 3D texture. If not supplied, must be available from the source.
  * @property {boolean} [preMultiplyAlpha] If true, the alpha channel will be multiplied into the other channels.
- * @property {string} [id] A unique identifier for the texture3D. If this is not given, then a GUID will be created.
+ * @property {string} [id] A unique identifier for the 3D texture. If this is not given, then a GUID will be created.
  *
  * @private
  */
@@ -253,7 +262,7 @@ function Texture3D(options) {
  * Load texel data from a buffer into a texture3D.
  *
  * @param {Texture3D} texture3D The texture3D to which texel values will be loaded.
- * @param {object} source The source for texel values to be loaded into the texture3D.
+ * @param {Texture3D.Source} source The source for texel values to be loaded into the texture3D.
  *
  * @private
  */
@@ -503,6 +512,7 @@ function setupSampler(texture3D, sampler) {
   gl.bindTexture(target, texture3D._texture);
   gl.texParameteri(target, gl.TEXTURE_MIN_FILTER, minificationFilter);
   gl.texParameteri(target, gl.TEXTURE_MAG_FILTER, magnificationFilter);
+  gl.texParameteri(target, gl.TEXTURE_WRAP_R, sampler.wrapR);
   gl.texParameteri(target, gl.TEXTURE_WRAP_S, sampler.wrapS);
   gl.texParameteri(target, gl.TEXTURE_WRAP_T, sampler.wrapT);
   if (defined(texture3D._textureFilterAnisotropic)) {
diff --git a/packages/engine/Specs/Renderer/SamplerSpec.js b/packages/engine/Specs/Renderer/SamplerSpec.js
index 7ae117336e27..71cfae9671f2 100644
--- a/packages/engine/Specs/Renderer/SamplerSpec.js
+++ b/packages/engine/Specs/Renderer/SamplerSpec.js
@@ -21,6 +21,7 @@ describe(
 
     it("has expected default values", function () {
       const sampler = new Sampler();
+      expect(sampler.wrapR).toEqual(TextureWrap.CLAMP_TO_EDGE);
       expect(sampler.wrapS).toEqual(TextureWrap.CLAMP_TO_EDGE);
       expect(sampler.wrapT).toEqual(TextureWrap.CLAMP_TO_EDGE);
       expect(sampler.minificationFilter).toEqual(
@@ -32,6 +33,14 @@ describe(
       expect(sampler.maximumAnisotropy).toEqual(1.0);
     });
 
+    it("throws when creating a sampler with invalid wrapR", function () {
+      expect(function () {
+        return new Sampler({
+          wrapR: "invalid wrap",
+        });
+      }).toThrowDeveloperError();
+    });
+
     it("throws when creating a sampler with invalid wrapS", function () {
       expect(function () {
         return new Sampler({