Reflection probes come in three basic types as chosen by the Type property in the inspector (see the component reference page for further details).
上記の 3 タイプの詳細を説明します。
A Baked Reflection Probe is one whose reflection cubemap is captured in the Unity editor and stored for subsequent usage in the player (see the Reflection Probes Introduction for further information). Once the capture process is complete, the reflections are “frozen” and so baked probes can’t react to runtime changes in the scene caused by moving objects. However, they come with a much lower processing overhead than Realtime Probes (which do react to changes) and are acceptable for many purposes. For example, if there is only a single moving reflective object then it need only reflect its static surroundings.
You should set the probe’s Type property to Baked or Custom in order to make it behave as a baked probe (see below for the additional features offered by Custom probes).
The reflections captured by baked probes can only include scene objects marked as Reflection Probe Static (using the Static menu at the top left of the inspector panel for all objects). You can further refine the objects that get included in the reflection cubemap using the Culling Mask and Clipping Planes properties, which work the same way as for a Camera (the probe is essentially like a camera that is rotated to view each of the six cubemap faces).
When the Auto option is switched on (from the Lighting window), the baked reflections will update automatically as you position objects in the scene. If you are not making use of auto baking then you will need to click the Bake button in the Reflection Probe inspector to update the probes. (The Build button in the Lighting window will also trigger the probes to update.)
The Dynamic Objects property on a custom probe’s inspector allows objects that are not marked as Reflection Probe Static to be included in the reflection cubemap.
Note: The positions of these objects are still “frozen” in the reflection at the time of baking.
The Cubemap property allows you to assign your own cubemap to the probe and therefore make it completely independent of what it can “see” from its view point. You could use this, say, to set a skybox or a cubemap generated from your 3D modelling app as the source for reflections.
ベイクしたプローブはさまざまな場面で有用であり、ランタイムのパフォーマンスが優れていますが、それらは、プレイヤー内をリアルタイムで更新しないという欠点があります。つまり、オブジェクトのリフレクションが一緒に移動しなくても、オブジェクトはシーン内を移動できます。これがあまりに制約となる場合は、リアルタイム プローブを使うことができます。リアルタイム プローブはランタイムにリフレクションキューブマップを更新します。この効果は、より高い処理オーバーヘッドとなりますが、よりリアルな外観を実現できます。
To enable a probe to update at runtime, you should set its Type property to Realtime in the Reflection Probe Inspector. You don’t need to mark objects as Reflection Probe Static to capture their reflections (as you would with a baked probe). However, you can selectively exclude objects from the reflection cubemap using the Culling Mask and Clipping Planes properties, which work the same way as for a Camera (the probe is essentially like a camera that is rotated to view each of the six cubemap faces).
In the editor, real-time probes have much the same workflow as baked probes, although they tend to render more quickly.
Note: Currently, real-time probes will only update their reflections in the Scene view when Reflection Probe Static objects are moved or change their appearance. This means that moving dynamic objects won’t cause an update even though those objects appear in the reflection. You should choose the Bake Reflection Probes option from the Build button popup on the Lighting window to update reflections when a dynamic object is changed.