to achieve a dual-scene fluid x-ray reveal effect in three. js, you can use two scenes: one for background content and another layered on top with transparent geometry representing what's "cut" out by an animated plane or shape that simulates your 'xray' view.
use `requestanimationframe` loops to animate the position of this overlay object while ensuring its transparency allows visibility beneath it.
// setup scenes & camerasconst scene1 = new three. Scene();scene. add(scene1);const xRayScene= 3d. scene(); // another separate one for fluid reveal effectlet planeGeometry, material;plane. addEventListener('mousedown', (e) => {const mousePosWorldSpace = camera. getWorldPosition(new THREE. Vector2());animateXray(e. clientX - window. innerWidth / 4);});function animateXray(xOffset){requestAnimationFrame(() =>{if(plane. position. x + xOffset> xRayScene. width || plane. positon. y <0)return;// update position and re-renderrenderer. render(scene1, camera);})}