public GraphicsBuffer GetVertexBuffer()

null

Use this method to retrieve the deformed vertex buffer for the current frame. Deformed vertex data is the vertex data after Unity applies skinning and blend shapes. If Unity hasn't deformed the mesh yet, no vertex buffer exists and this method returns null.

If the buffer has a target that allows compute access, such as GraphicsBuffer.Target.Raw or GraphicsBuffer.Target.Structured, you can use it to access the current frame's deformed vertex data in a ComputeShader or another shader. When Unity deforms the mesh on the GPU, the buffer already has such a target; otherwise, request one with SkinnedMeshRenderer.vertexBufferTarget or EditorGraphicsSettings.defaultMeshBufferTarget. Bind the buffer as a shader parameter by using ComputeShader.SetBuffer, Material.SetBuffer, or a similar method.

Additional Resources: SkinnedMeshRenderer.vertexBufferTarget, SkinnedMeshRenderer.GetPreviousVertexBuffer.