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Fixed star movement when dragging #2

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Merged
bkmcoding merged 1 commit into from
Oct 13, 2026
Merged

Fixed star movement when dragging #2

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22 changes: 19 additions & 3 deletions web/script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,11 @@ renderer.setClearColor(0x000005, 1)
const camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, CAM_MAX_DIST)
scene.add(camera)

function makeStarLayer(count, size, opacity) {
const starLayers = []
const starInverseQuat = new THREE.Quaternion()
const starOffset = new THREE.Vector3()

function makeStarLayer(count, size, opacity, parallax) {
const verts = []
for (let i = 0; i < count; i++) {
const theta = Math.random() * Math.PI * 2
Expand All @@ -53,9 +57,20 @@ function makeStarLayer(count, size, opacity) {
)
pts.renderOrder = -999
camera.add(pts)
starLayers.push({ points: pts, parallax })
}
makeStarLayer(18000, 0.8, 0.18)
makeStarLayer(2500, 1.5, 0.3)

function updateStarLayers() {
starInverseQuat.copy(camQuat).invert()
starLayers.forEach(({ points, parallax }) => {
starOffset.copy(camTarget).multiplyScalar(parallax)
points.position.copy(starOffset).applyQuaternion(starInverseQuat)
points.quaternion.copy(starInverseQuat)
})
}

makeStarLayer(18000, 0.8, 0.18, 0.02)
makeStarLayer(2500, 1.5, 0.3, 0.06)

const nebulaColors = [
{ color: new THREE.Color(0.08, 0.04, 0.18), count: 3000, radius: 800, spread: 600 },
Expand Down Expand Up @@ -437,6 +452,7 @@ window.addEventListener('resize', () => {
;(function animate() {
requestAnimationFrame(animate)
tickInertia()
updateStarLayers()
renderer.render(scene, camera)
})()

Expand Down
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