Version: 2021.1
Using the Built-in Render Pipeline
Forward rendering path

Rendering paths in the Built-in Render Pipeline

Unity’s Built-In Render Pipeline supports different rendering paths. A rendering path is a series of operations related to lighting and shading. Different rendering paths have different capabilities and performance characteristics. Deciding on which rendering path is most suitable for your Project depends on the type of Project, and on the target hardware.

You can choose the rendering path that your Project uses in the Graphics window, and you can override that path for each Camera.

If the GPU on the device running your Project does not support the rendering path that you have selected, Unity automatically uses a lower fidelity rendering path. For example, on a GPU that does not handle Deferred Shading, Unity uses Forward Rendering.

Forward Rendering

Forward Rendering is the default rendering path in the Built-in Render Pipeline. It is a general-purpose rendering path.

Real-time lights are very expensive to render in forward rendering. To offset this cost, you can choose how many lights Unity should render per-pixel at any one time. Unity renders the rest of the lights in the Scene at lower fidelity: per-vertex, or per-object.

If your project does not use a large amount of real-time lights, or if lighting fidelity is not important to your project, then this rendering path is likely to be a good choice for your project.

Для дополнительной информации, посетите страницу про упреждающий рендеринг.

Deferred Shading

Deferred Shading is the rendering path with the most lighting and shadow fidelity in the Built-in Render Pipeline.

Deferred shading requires GPU support, and has some limitations. It does not support semi-transparent objects (Unity renders these using forward rendering), orthographic projection (Unity uses forward rendering for these Cameras), or hardware anti-aliasing (although you can use a post-process effect to achieve similar results). It has limited support for culling masks, and treats the Renderer.receiveShadows flag as always true.

If your project has a large number of real-time lights and requires a high level of lighting fidelity, and your target hardware supports deferred shading, then this rendering path might be a good choice for your project.

For more details, including advice on this rendering path’s limitations, see the Deferred Shading page.

Legacy Deferred

Legacy Deferred (light prepass) is similar to Deferred Shading, except it uses a different technique with different trade-offs. It does not support the Unity 5 physically based standard shader.

Для дополнительной информации, посетите страницу про отложенное освещение.

Legacy Vertex Lit

Legacy Vertex Lit is the rendering path with the lowest lighting fidelity and no support for real-time shadows. It is a subset of the Forward rendering path.

Для дополнительной информации, посетите страницу про вершинное освещение.

Rendering Path comparison

Deferred Forward Legacy Deferred Vertex Lit
Возможности
Попиксельное освещение (карты нормалей, источники освещения с cookie) Да Да Да -
Real-time shadows Да With caveats Да -
Reflection Probes Да Да - -
Depth & Normal Buffers Да С дополнительными проходами рендеринга Да -
Мягкие частицы Да - Да -
Semi-transparent objects - Да - Да
Сглаживание Anti-Aliasing - Да - Да
Маски выборочного рендеринга у источников света Ограниченно Да Ограниченно Да
Точность освещения Все источники попиксельные Некоторые источники попиксельные Все источники попиксельные Все источники повертексные (вершинные)
Производительность
Зависимость потребления ресурсов попиксельным источником света Количество освещаемых пикселей Количество освещаемых пикселей * количество освещаемых объектов Количество освещаемых пикселей -
Number of times objects are normally rendered 1 Зависимость потребления ресурсов попиксельным источником света 2 1
Overhead for simple Scenes High Ничего Medium Ничего
Поддержка на разных платформах
PC (Windows/Mac) Shader Model 3.0+ & MRT Все Shader Model 3.0+ Все
Мобильные платформы (iOS/Android) OpenGL ES 3.0 & MRT, Metal (on devices with A8 or later SoC) Все OpenGL ES 2.0 Все
Консоли XB1, PS4 Все XB1, PS4, 360 -
Using the Built-in Render Pipeline
Forward rendering path
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