Unity First Person Objects

/// <summary>
/// Component which renders object on top of all other object.
/// </summary>
public class FirstPersonEffect : MonoBehaviour
{
    public Camera Camera;

    public Material DepthClearMaterial;

    List<Renderer> m_renderers = new List<Renderer>();
    CommandBuffer m_cmdBuffer;

    private void OnEnable()
    {
        m_cmdBuffer = new CommandBuffer();
        Camera.AddCommandBuffer(CameraEvent.AfterGBuffer, m_cmdBuffer);
        UpdateCommandBuffer();
    }

    private void OnDisable()
    {
        Camera.RemoveCommandBuffer(CameraEvent.AfterGBuffer, m_cmdBuffer);
        m_cmdBuffer.Dispose();
    }

    private void OnTransformChildrenChanged()
    {
        UpdateCommandBuffer();
    }

    private void UpdateCommandBuffer()
    {
        m_cmdBuffer.Clear();

        GetComponentsInChildren(m_renderers);

        // Render first with DepthClear material
        foreach (var rend in m_renderers)
        {
            for (int i = 0; i < rend.materials.Length; i++)
            {
                m_cmdBuffer.DrawRenderer(rend, DepthClearMaterial, i);
            }
        }

        // Then render with it's material
        foreach (var rend in m_renderers)
        {
            for (int i = 0; i < rend.materials.Length; i++)
            {
                var material = rend.materials[i];
                int pass = material.FindPass("DEFERRED");
                m_cmdBuffer.DrawRenderer(rend, material, i, pass != -1 ? pass : 0);
            }
        }
    }
}