Chapter 272: SSAARenderPass

Core Idea

Supersample Anti-Aliasing Render Pass.

This manual approach to SSAA re-renders the scene ones for each sample with camera jitter and accumulates the results.

camera : Camera: The camera.
clearAlpha : number: The clear alpha of the render pass.
clearColor : number | Color | string: The clear color of the render pass.
sampleLevel : number: The sample level. Specified as n, where the number of samples is 2^n, so sampleLevel = 4, is 2^4 samples, 16.
scene : Scene: The scene to render.
stencilBuffer : boolean: Whether to use a stencil buffer or not. This property can't be changed after the first render.
unbiased : boolean: Whether the pass should be unbiased or not. This property has the most visible effect when rendering to a RGBA8 buffer because it mitigates…

const ssaaRenderPass = new SSAARenderPass( scene, camera );
ssaaRenderPass.sampleLevel = 3;
composer.addPass( ssaaRenderPass );

Constructor

Signature
`new SSAARenderPass( scene : Scene, camera : Camera, clearColor : number

Properties

Property	Description
`.camera : Camera`	The camera.
`.clearAlpha : number`	The clear alpha of the render pass.
`.clearColor : number	Color
`.sampleLevel : number`	The sample level. Specified as n, where the number of samples is 2^n, so sampleLevel = 4, is 2^4 samples, 16.
`.scene : Scene`	The scene to render.
`.stencilBuffer : boolean`	Whether to use a stencil buffer or not. This property can't be changed after the first render.
`.unbiased : boolean`	Whether the pass should be unbiased or not. This property has the most visible effect when rendering to a RGBA8 buffer because it mitigates rounding errors. By default RGBA16F is used.

Methods

Method	Description
`.dispose()`	Frees the GPU-related resources allocated by this instance. Call this method whenever the pass is no longer used in your app.
`.render( renderer : WebGLRenderer, writeBuffer : WebGLRenderTarget, readBuffer : WebGLRenderTarget, deltaTime : number, maskActive : boolean )`	Performs the SSAA render pass.
`.setSize( width : number, height : number )`	Sets the size of the pass.