How can I generate motion vector maps in Blender for Three.js motion blur effects?

I understand you're looking to create motion vector maps for use in Three.js to achieve motion blur or directional displacement effects. While I can provide some guidance on how these might be used in Three.js, the specific process of generating motion vector maps in Blender is outside my area of expertise.

For implementing directional displacement in Three.js, you could use the motion vector map as a displacement map with a MeshStandardMaterial. According to the documentation:

Using Displacement Maps in Three.js

The displacementMap property of materials like MeshStandardMaterial affects the position of mesh vertices. Unlike other maps that only affect lighting and shadows, displaced vertices can:

• Cast shadows
• Block other objects
• Act as real geometry

The displacement texture works by mapping each vertex to the value of pixels in the image (white being the highest) and repositioning them accordingly.

JAVASCRIPTCopied
// Example of using a displacement map
const material = new THREE.MeshStandardMaterial({
  map: diffuseTexture,
  displacementMap: motionVectorTexture,
  displacementScale: 1.0, // Adjust this value to control displacement intensity
  displacementBias: 0.0
});

For animation purposes, you might want to look into the animation track system in Three.js, which includes:

• VectorKeyframeTrack - for animating vector properties
• NumberKeyframeTrack - for animating scalar values like displacement intensity

If you're specifically looking to implement motion blur effects, you might need to use custom shaders rather than the built-in displacement mapping.

I hope this helps with the Three.js implementation aspect of your question. For the Blender-specific workflow to generate these motion vector maps, you might want to consult Blender documentation or communities focused on Blender techniques.