docs: update hdr docs

docs/resource-manager.md

@@ -115,7 +115,9 @@ const textureCube = await this.engine.resourceManager.load<TextureCube>({
 
 [TextureCube](${api}core/TextureCube) uses six pictures as original resources, uses urls to pass the links of six pictures, and uses [AssetType.TextureCube](${api}core/AssetType#TextureCube) for type.
 
-### 3. HDR
+Of course, if you feel that it is a bit troublesome to pass 6 images, you can also use an HDR loader. The advantage is that only one .hdr texture in RGBE format can be used as the background of the skybox; the disadvantage is that the HDR loader is generally used for baking. The color range exceeds the [0-1] environment map, so the file size will be relatively large. If it is only used as a skybox display, the color beyond the [0-1] range is invalid, and the cost performance will be relatively low.
+So HDR Loader is suitable for scenarios where there are other uses for floating point color.
+
 ```typescript
 import { TextureCube } from "oasis-engine";
 
@@ -131,9 +133,8 @@ engine.resourceManager
   });
 ```
 
-HDR Loader use [AssetType.HDR](${api}core/AssetType#HDR) to load texture with .HDR format，The resulting product is also a cube texture.
 
-### 4. Environment
+### 3. Environment
 Oasis supports offline baking through [Oasis Editor](https://oasis.alipay.com/editor) or [glTF Viewer](https://oasisengine.cn/gltf-viewer) to get IBL baked products `*.env` file.
 
 ![gltf viewer](https://gw.alipayobjects.com/mdn/rms_7c464e/afts/img/A*9mGbSpQ4HngAAAAAAAAAAAAAARQnAQ)
@@ -150,7 +151,7 @@ engine.resourceManager
     scene.ambientLight = ambientLight;
   });
 ```
-### 5. Compressed texture
+### 4. Compressed texture
 
 > For more compressed texture related documents, please refer to [Compressed Texture](${docs}texture-compression).
 
@@ -162,7 +163,7 @@ const compressedTexture2D = await this.engine.resourceManager.load<Texture2D>("t
 
 The suffix of compressed texture is generally `ktx`, and you need to pay attention to the compressed texture format supported by the platform when using it. After the compressed texture is loaded, the result is also [Texture2D](${api}core/Texture2D).
 
-### 6. Compressed Cube Texture
+### 5. Compressed Cube Texture
 
 The loading of the compressed cube texture is different from the general cube texture. It is a separate binary file path, instead of the file path of 6 images, but it needs to be specified as [AssetType.KTXCube](${api}core/AssetType#KTXCube), because ResourceManager cannot identify which specific type of Loader needs to be used based on the suffix.
 
@@ -175,7 +176,7 @@ const compressedTextureCube = await this.engine.resourceManager.load<TextureCube
 });
 ```
 
-### 7. glTF
+### 6. glTF
 
 What you get after the resource is loaded is a [GLTFResource](${api}loader/GLTFResource) resource, including [Scene](${api}core/Scene), [Entity](${api}core/Entity), [Texture ](${api}core/Texture), [Material](${api}core/Material) and [AnimationClip](${api}core/AnimationClip) and other objects.
 
@@ -189,7 +190,7 @@ const gltf = await this.engine.resourceManager.load<GLTFResource>("test.gltf");
 
 Go to [glTF resources](${docs}gltf) to learn more about glTF related designs.
 
-### 8. Custom Loader
+### 7. Custom Loader
 
 Users can also customize the loader to load custom resources:
 

docs/resource-manager.zh-CN.md

@@ -113,7 +113,9 @@ const textureCube = await this.engine.resourceManager
 
 [TextureCube](${api}core/TextureCube) 使用六张图片作为原始资源，用 urls 传递六张图片链接，type 使用 [AssetType.TextureCube](${api}core/AssetType#TextureCube) 。
 
-### 3. HDR
+当然，如果你觉得传递6张图片有点麻烦，也可以使用 HDR 解析器，他的优点是仅需要一张 RGBE 格式的 .hdr 贴图就可以作为天空盒的背景；缺点是 HDR 解析器一般用来烘焙颜色范围超出【0-1】的环境贴图，所以文件体积会比较大，如果仅仅用来当作天空盒展示，超出【0-1】范围的颜色是无效的，性价比会比较低。
+因此 HDR Loader 适用于那些对浮点颜色还有别的用途的场景。
+
 ```typescript
 import { TextureCube } from "oasis-engine";
 
@@ -129,15 +131,13 @@ engine.resourceManager
   });
 ```
 
-HDR Loader 使用 [AssetType.HDR](${api}core/AssetType#HDR) 加载 .HDR 格式的贴图，得到的产物也是立方体纹理。
-
 
-### 4. Environment
+### 3. AmbientLight
 Oasis 支持通过[编辑器](https://oasis.alipay.com/editor)或者 [glTF Viewer](https://oasisengine.cn/gltf-viewer) 进行离线烘焙得到 IBL 烘焙产物 `*.env` 文件。
 
 ![gltf viewer](https://gw.alipayobjects.com/mdn/rms_7c464e/afts/img/A*9mGbSpQ4HngAAAAAAAAAAAAAARQnAQ)
 
-拿到 `*.env` 后，我们可以通过 resourceManager 加载环境光：
+拿到 `*.env` 后，我们可以直接通过 resourceManager 加载环境光：
 
 ```typescript
 engine.resourceManager
@@ -150,7 +150,7 @@ engine.resourceManager
   });
 ```
 
-### 5. 压缩纹理
+### 4. 压缩纹理
 > 更多压缩纹理相关文档可查阅[压缩纹理](${docs}texture-compression-cn)。
 
 ```typescript
@@ -161,7 +161,7 @@ const compressedTexture2D = await this.engine.resourceManager.load<Texture2D>("t
 压缩纹理后缀一般为 `ktx` ，使用时需注意平台支持的压缩纹理格式。压缩纹理加载后得到的也是 [Texture2D](${api}core/Texture2D) 。
 
 
-### 6. 压缩立方体纹理
+### 5. 压缩立方体纹理
 压缩的立方体纹理的加载和一般的立方体纹理加载不一样，是单独的一个二进制文件路径，而不需要 6 张图片的文件路径，但是需要指定为类型为 [AssetType.KTXCube](${api}core/AssetType#KTXCube)。因为 ResourceManager 无法根据后缀识别需要使用哪种特定类型的 Loader。
 
 ```typescript
@@ -170,7 +170,7 @@ import { TextureCube } from "oasis-engine";
 const compressedTextureCube = await this.engine.resourceManager.load<TextureCube>({url: "test.ktx", type: AssetType.KTXCube});
 ```
 
-### 7. glTF
+### 6. glTF
 
 资源加载后得到的是一个 [GLTFResource](${api}loader/GLTFResource) 资源，包含 [Scene](${api}core/Scene)、[Entity](${api}core/Entity)、[Texture](${api}core/Texture)、[Material](${api}core/Material) 和 [AnimationClip](${api}core/AnimationClip) 等对象。
 
@@ -184,7 +184,7 @@ const gltf = await this.engine.resourceManager.load<GLTFResource>("test.gltf");
 
 前往[ glTF 资源](${docs}gltf-cn) 了解更多 glTF 相关设计。
 
-### 8. 自定义加载器
+### 7. 自定义加载器
 用户也可以自定义加载器来加载自定义的资源：
 
 ```typescript