Camera-Reprojection Antialiasing

Reconstruct previous-frame image coordinates from scene depth and camera transforms when a per-pixel velocity buffer is unavailable. createCameraReprojectionTAAShaderPassPipeline powers the camera-aware temporal antialiasing path in luma.gl's ANARI rendering runtime.

At a Glance

Property	Value
Export	createCameraReprojectionTAAShaderPassPipeline
Backend	WebGPU
Render passes	Three: temporal resolve, resolved-color copy, and depth-history copy
Required binding	depthTexture
Persistent state	Full-resolution rgba16float color and depth history
Motion model	Camera motion and static-world geometry; no object-velocity attachment

Usage

import {ShaderPassRenderer} from '@luma.gl/engine';
import {createCameraReprojectionTAAShaderPassPipeline} from '@luma.gl/effects';

const renderer = new ShaderPassRenderer(device, {
  colorFormat: 'rgba16float',
  shaderPasses: [createCameraReprojectionTAAShaderPassPipeline()]
});

renderer.renderToScreen({
  sourceTexture: sceneColorTexture,
  bindings: {depthTexture: sceneDepthTexture},
  uniforms: {
    cameraReprojectionTaaResolve: {
      inverseViewProjectionMatrix,
      previousViewProjectionMatrix,
      historyWeight: 0.9,
      depthThreshold: 0.0025,
      currentJitter,
      previousJitter
    }
  },
  resetHistory: cameraCut || sceneTopologyChanged
});

Parameters

Parameter	Default	Description
inverseViewProjectionMatrix	Identity	Inverse current unjittered camera transform used to reconstruct world position.
previousViewProjectionMatrix	Identity	Previous unjittered camera transform used to project that position into history.
historyWeight	0.9	Fraction of accepted previous-frame color blended into the current pixel.
depthThreshold	0.0025	Maximum normalized-device-depth disagreement before history is discarded.
currentJitter	[0, 0]	Current projection jitter expressed in normalized image coordinates.
previousJitter	[0, 0]	Previous projection jitter expressed in normalized image coordinates.

Limitations and History Management

Camera reprojection can follow static-world surfaces as the view changes, but it cannot infer independent object motion without a velocity texture. Reset history when moving-object topology, render resolution, or camera continuity changes. Use velocity-aware Temporal Antialiasing for animated scenes that already publish per-pixel motion vectors.

Related Effects

• Temporal Antialiasing supports application-provided object velocity.
• FXAA requires no history, depth, jitter, or camera transforms.
• ANARI Rendering documents the renderer that consumes this pipeline.