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# SCNTechniqueSupport

The common interface for SceneKit objects that support multipass rendering using [`SCNTechnique`](/documentation/SceneKit/SCNTechnique) objects.

```
protocol SCNTechniqueSupport : NSObjectProtocol
```

## Overview

Techniques let you specify approaches to rendering a scene that involves multiple drawing passes. For example, you might create a technique that uses a shader program to postprocess a rendered scene on the GPU, creating special effects such as color grading, screen-space ambient occlusion, or motion blur. Different SceneKit objects support techniques in different ways, summarized in Table 1.

|Class                                                                                                                                                                                             |Description                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------|
|``doc://com.apple.scenekit/documentation/SceneKit/SCNView``, ``doc://com.apple.scenekit/documentation/SceneKit/SCNLayer`` (macOS), ``doc://com.apple.scenekit/documentation/SceneKit/SCNRenderer``|Apply effects whenever the scene is rendered.              |
|``doc://com.apple.scenekit/documentation/SceneKit/SCNCamera``                                                                                                                                     |Apply effects when the camera is the current point of view.|
|``doc://com.apple.scenekit/documentation/SceneKit/SCNLight``                                                                                                                                      |Apply effects when the light is enabled.                   |

## Topics

### Specifying a Technique

[`technique`](/documentation/SceneKit/SCNTechniqueSupport/technique)

The technique SceneKit uses when rendering the object.


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