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Checkpoint max page cover geometry

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This commit is contained in:
Georg Tomitsch
2026-06-05 12:06:38 +02:00
parent 467842ba0b
commit fc38dca7cf
2 changed files with 39 additions and 10 deletions
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public/js/webgl-book-shape-lab.js
+38 -9
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@@ -65,6 +65,13 @@ const FAST_FLIP_DURATION = 900;
const FAST_FLIP_COUNT = 10;
const FAST_FLIP_OVERLAP = 5;
const OPEN_SEAM_GAP = 0.003;
const PAGE_COUNT_MIN = 40;
const PAGE_COUNT_STEP = 10;
const PAGE_WIDTH = 1.62;
const PAGE_DEPTH = 2.24;
const COVER_OVERHANG = 0.13;
const COVER_SUPPORT_OVERHANG = 0.055;
const HINGE_INSET = 0.07;
const SUPPORT_ANGLE_STEPS = 720;
const SUPPORT_ANGLE_CANDIDATES = Array.from({ length: SUPPORT_ANGLE_STEPS }, (_, sample) => {
const angle = sample / SUPPORT_ANGLE_STEPS * Math.PI * 2;
@@ -75,6 +82,8 @@ const SUPPORT_ANGLE_CANDIDATES = Array.from({ length: SUPPORT_ANGLE_STEPS }, (_,
};
});
const maximumPageCount = calculateMaximumPageCount();
let readingProgress = readInitialProgress();
let pageCount = readInitialPageCount();
let lastLengthError = 0;
@@ -83,6 +92,7 @@ let lastBookModel = null;
let activeSpineHalf = 0.08;
let activeFlips = [];
let pendingPageFlips = 0;
pageCountInput.max = String(maximumPageCount);
progressInput.value = readingProgress.toFixed(3);
progressValue.value = readingProgress.toFixed(2);
pageCountInput.value = String(pageCount);
@@ -165,7 +175,7 @@ function readInitialPageCount() {
}
function snapPageCount(value) {
return THREE.MathUtils.clamp(Math.round(value / 10) * 10, 40, 600);
return THREE.MathUtils.clamp(Math.round(value / PAGE_COUNT_STEP) * PAGE_COUNT_STEP, PAGE_COUNT_MIN, maximumPageCount);
}
function setReadingProgress(value) {
@@ -196,8 +206,8 @@ function rebuildBook() {
const coverDepth = 2.30;
const coverThickness = BOOK_PROFILE.coverThickness;
const pageWidth = 1.62;
const pageDepth = 2.24;
const pageWidth = PAGE_WIDTH;
const pageDepth = PAGE_DEPTH;
const bundleCount = Math.max(4, Math.round(pageCount / 10));
const spineWidth = calculateSpineWidth(bundleCount);
const leftCount = calculateLeftBundleCount(bundleCount);
@@ -230,11 +240,9 @@ function addCoverAssembly(pageWidth, depth, thickness, spineWidth) {
}
function createCoverAssemblyGeometry(pageWidth, depth, thickness, spineWidth) {
const overhang = 0.13;
const spineHalf = spineWidth * 0.5;
const hingeInset = 0.07;
const outerX = pageWidth + overhang;
const hingeX = spineHalf + hingeInset;
const outerX = spineHalf + pageWidth + COVER_OVERHANG;
const hingeX = spineHalf + HINGE_INSET;
const outerTopY = BOOK_PROFILE.tableY + thickness;
const connectionTopY = BOOK_PROFILE.raisedHingeY;
const spineTopY = BOOK_PROFILE.tableY + thickness;
@@ -357,6 +365,27 @@ function calculateSpineWidth(bundleCount) {
return high;
}
function calculateMaximumPageCount() {
let maximum = PAGE_COUNT_MIN;
for (let candidate = PAGE_COUNT_MIN; candidate <= 1000; candidate += PAGE_COUNT_STEP) {
const bundleCount = Math.max(4, Math.round(candidate / 10));
if (!isBundleCountReachable(bundleCount)) break;
maximum = candidate;
}
return maximum;
}
function isBundleCountReachable(bundleCount) {
const spineWidth = calculateSpineWidth(bundleCount);
const bundleSpacing = calculateBundleSpacing(bundleCount, spineWidth, bundleCount);
const topRank = bundleCount - 1;
const target = restingTarget(1, PAGE_WIDTH, topRank, bundleCount, bundleSpacing);
const anchor = spineCurvePoint(1, spineWidth);
const requiredDistance = Math.hypot(target.x - anchor.x, target.y - anchor.y);
const verticalRise = target.y - anchor.y;
return requiredDistance <= PAGE_WIDTH && verticalRise <= PAGE_WIDTH * 0.5;
}
function calculateBundleSpacing(bundleCount, spineWidth, leftCount) {
const rightCount = bundleCount - leftCount;
const stackIntervals = Math.max(0, leftCount - 1) + Math.max(0, rightCount - 1);
@@ -795,8 +824,8 @@ function upwardNormalAt(points, index) {
function coverTopYAtX(x) {
const ax = Math.abs(x);
const spineHalf = currentSpineHalf();
const hingeX = spineHalf + 0.07;
const outerX = 1.62 + 0.055;
const hingeX = spineHalf + HINGE_INSET;
const outerX = spineHalf + PAGE_WIDTH + COVER_SUPPORT_OVERHANG;
if (ax <= spineHalf) return BOOK_PROFILE.coverThickness;
if (ax <= hingeX) {
const t = (ax - spineHalf) / (hingeX - spineHalf);