Rendering Order

    For example:

    Therefore, the overall rendering order in the figure above is C -> B -> b1 -> A -> a1 -> a2, and the rendering state on the screen is C -> b1 -> B -> a2 -> a1 -> A. i.e. from bottom to top.

    The UI camera has the highest priority when it was originally designed, that is, the UI camera content is only drawn after all 3D content is drawn. However, this will cause a problem. Once the UI camera has a background or large icon, it will block the 3D content. Therefore, a mixed sorting function between cameras is essential.

    The key factor of the mixed sorting of the UI camera and the 3D camera is here in the UI camera. Therefore, the Canvas on the root node of the UI, which is the Canvas node, provides a property called RenderMode to distinguish the sorting method.Next, talk about the role of the RenderMode option:

    1. When the selection mode is OVERLAY, it means that the UI camera will always be behind the 3D camera, which means will always cover the rendering content of the 3D camera. Multiple UI cameras select this mode, and use the attribute Priority to sort between UI cameras.

    2. When the selection mode is INTERSPERSE, it is possible to mix and sort with the 3D camera. The sorting method between UI camera and the 3D camera is done by setting Priority on the component.

      intersperse

    Sorting is a very simple function, but the final rendering is based on the rendering capabilities provided by different platforms. Therefore, explain here. If you encounter an error in UI rendering, such as flickering or unwanted artifacts or other please consider the following. The first thing to check is the ClearFlag of all cameras (Camera and Canvas) in the scene, and make sure that the lowest Canvas or Camera‘s ClearFlag property is set to SOLID_COLOR in each scene.

    • If the scene contains 2D background layer, 3D scene layer, 2D UI layer, then:
      • 2D background layer: ClearFlag property is set to Solid_Color.
      • 2D UI layer: If the model is included, the ClearFlag property is set to Depth_Only to avoid a model splash screen. If no model is present, the ClearFlag property can be set to Dont_Clear/.