Unity Lighting - The Precompute Process 预计算过程（二）

 

The Precompute Process

预计算过程

In Unity, precomputed lighting is calculated in the background - either as an automatic process, or it is initiated manually. In either case, it is possible to continue working in the editor while these processes run behind-the-scenes.

在Unity中，预先计算的照明在后台计算 - 既可以作为自动处理，也可以手动启动。无论哪种情况，都可以在编辑器中继续工作，而这些过程在幕后运行。

When the precompute process is running, a blue progress bar will appear in the bottom right of the Editor. There are different stages which need to be completed depending on whether Baked GI or Precomputed Realtime GI is enabled. Information on the current process is shown on-top of the progress bar.

预计算过程正在运行时，编辑器右下方将出现一个蓝色进度条。根据是否启用了烘焙GI或预计算实时GI，需要完成不同的阶段。有关当前进程的信息显示在进度栏的顶部。

Progress bar showing the current state of Unity’s precompute.

预先计算StagesProgress栏显示Unity预先计算的当前状态。

In the example above, we can see that we are at task 5 of 11 which is, ‘Clustering’ and there are 108 jobs remaining before that task is complete and the precompute moves on to task 6. The various stages are listed below:

在上面的例子中，我们可以看到我们处于11的任务5中，即'集群'，并且在任务完成之前剩余108个作业，并且预计算前进到任务6。下面列出了各个阶段：

Precomputed Realtime GI			Baked GI
01 - Create Geometry			01 - Create Geometry
02 - Layout Systems			02 - Atlassing
03 - Create Systems			03 - Create Baked Systems
04 - Create Atlas			04 - Baked Resources
05 - Clustering			05 - Bake AO
06 - Visibility			06 - Export Baked Texture
07 - Light Transport			07 - Bake Visibility
08 - Tetrahedralize Probes			08 - Bake Direct
09 - Create ProbeSet			09 - Ambient and Emissive
			10 - Create Bake Systems
Probes			11 - Bake Runtime
			12 - Upsampling Visibility
01 - Ambient Probes			13 - Bake Indirect
02 - Baked/Realtime Ref. Probes			14 - Final Gather
			15 - Bake ProbesSet
			16 - Compositing

Starting a Precompute

开始预计算

Only static geometry is considered by Unity’s precomputed lighting solutions. To begin the lighting precompute process we need at least one GameObject marked as ‘static’ in our scene. This can either be done individually, or by shift-selecting multiple GameObjects from the hierarchy panel.

Unity的预计算照明解决方案只考虑静态几何。要开始照明预计算过程，我们需要至少一个在我们的场景中标记为“静态”的游戏对象。这可以单独完成，也可以通过从层次结构面板中移动选择多个GameObjects来完成。

From the Inspector panel, the Static checkbox can be selected (Inspector>Static). This will set all of the GameObject’s ‘static options’, or ‘flags’, including navigation and batching, to be static, which may not be desirable. For Precomputed Realtime GI, only 'Lightmap Static' needs to be checked.

在Inspector面板中，可以选择静态复选框（Inspector> Static）。这会将GameObject的所有“静态选项”或“标志”（包括导航和批处理）设置为静态，这可能并不理想。对于预先计算好的实时GI，只需要检查“Lightmap Static”。

For more fine-grained control, individual static options can be set from the drop-down list accessible to the right of the Static checkbox in the Inspector panel. Additionally, objects can also be set to Static in the Object area of the lighting window.

要进行更细粒度的控制，可以从“检查器”面板中“静态”复选框右侧的可访问下拉列表中设置各个静态选项。此外，对象也可以在照明窗口的对象区域中设置为静态。

If your scene is set to Auto (Lighting>Scene>Auto), Unity’s lighting precompute will now begin automatically. Otherwise it will need to be started manually as described below.

如果您的场景设置为自动（照明>场景>自动），则Unity的照明预计算现在将自动开始。否则，需要按照以下说明手动启动。

Auto/Manual Precompute

自动/手动预计算

If ‘Auto’ is checked from the bottom of Unity’s Lighting panel (Lighting>Scene>Auto), then this precompute will begin automatically as a background process whenever changes are made to static geometry within your scene.

如果从Unity的“照明”面板的底部（光照>场景>自动）检查到“自动”，则每当对场景中的静态几何体进行更改时，此预计算将自动作为后台进程开始。

However, if Auto is not selected, you will need to manually start a precompute by clicking the ‘Build’ button next to it. This will begin the precompute in much the same way, while giving you control over when this process starts.

但是，如果未选中自动，则需要通过单击旁边的“生成”按钮手动启动预计算。这将以几乎相同的方式开始预计算，同时让您控制此过程何时开始。

Manually initiating a precompute will cause all aspects of your scene lighting to be evaluated and (re)computed. If you wish to selectively recalculate Reflection probes by themselves, this can be done via the drop-down menu next to the Build button (Lighting>Scene>Build).

手动启动预计算将导致评估和（重新）计算场景照明的各个方面。如果您希望有选择地单独重新计算反射探头，可以通过Build按钮旁边的下拉菜单（Lighting> Scene> Build）完成此操作。

GI Cache

In either Baked GI or Precomputed Realtime GI, Unity ‘caches’ (stores) data about your scene lighting in the ‘GI Cache’, and will try to reuse this data whenever possible to save time during precompute. The number and nature of the changes you have made to your scene will determine how much of this data can be reused, if at all.

无论是烘焙GI还是预计算实时GI，Unity都会在“GI缓存”中缓存（存储）有关场景照明的数据，并会尽可能重复使用此数据，以便在预计算时节省时间。您对场景进行的更改的数量和性质将决定可以重复使用这些数据的数量（如果有的话）。

This cache is stored outside of your Unity project and can be cleared using (Preference>GI Cache>Clear Cache). Clearing this means that all stages of the precompute will need to be recalculated from the beginning and this can therefore be time consuming. However in some cases, where perhaps you need to reduce disk usage, this may be helpful.

该缓存存储在Unity项目之外，可以使用（首选项> GI缓存>清除缓存）清除。清除它意味着预计算的所有阶段都需要从头开始重新计算，因此这可能非常耗时。但是，在某些情况下，您可能需要减少磁盘使用量，这可能会有所帮助。

来源： https://unity3d.com/cn/learn/tutorials/topics/graphics/precompute-process?playlist=17102

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