Added ray tracing and animations page

com.unity.render-pipelines.high-definition/Documentation~/Ray-Tracing-Animations.md

@@ -0,0 +1,24 @@
+# Ray tracing and animation
+
+If your Project uses ray-traced effects, you may need to perform further steps to display particular animations correctly.
+
+## Alembic
+
+If you use an [alembic](https://docs.unity3d.com/Packages/com.unity.formats.alembic@latest) animated mesh, the animation may not appear to play in ray-traced effects. To fix this:
+
+1. Select the GameObject with the alembic animated mesh.
+2. In the Inspector, find the **Mesh Renderer** component.
+3. In the **Ray Tracing** section, set **Ray Tracing Mode** to **Dynamic Geometry**.
+
+This allows the alembic mesh to animate in ray-traced effects.
+
+## Skinned Mesh Renderer
+
+If you use a [Skinned Mesh Renderer](<https://docs.unity3d.com/Manual/class-SkinnedMeshRenderer.html>) and the mesh is culled by the camera, the animation may not appear to play in ray-traced effects. To fix this:
+
+1. Find and select the [Volume](Volumes.md) that contains your [Ray Tracing Settings](Ray-Tracing-Settings.md).
+2. In the Inspector, find the **Volume** component.
+3. Override and enable the **Extend Camera Culling** property.
+
+This allows the Skinned Mesh Renderer to animate in ray-traced effects.
+

com.unity.render-pipelines.high-definition/Documentation~/TableOfContents.md

@@ -155,6 +155,7 @@
     * [Recursive Rendering](Ray-Tracing-Recursive-Rendering)
   * Shader Graph Keywords
     * [Raytracing Quality](SGNode-Raytracing-Quality)
+  * [Ray Tracing and Animations](Ray-Tracing-Animations.md)
   * Debugging
     * [Debugging Ray-Traced Effects](Ray-Tracing-Debug)
 * Components