molstar
Version:
A comprehensive macromolecular library.
75 lines (74 loc) • 2.21 kB
JavaScript
/**
* Copyright (c) 2018-2025 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
const plane = {
vertices: new Float32Array([
-0.5, 0.5, 0,
0.5, 0.5, 0,
-0.5, -0.5, 0,
0.5, -0.5, 0
]),
normals: new Float32Array([
0, 0, 1,
0, 0, 1,
0, 0, 1,
0, 0, 1
]),
indices: new Uint32Array([
0, 2, 1,
1, 2, 3
])
};
const planeCage = {
vertices: plane.vertices,
edges: new Uint32Array([0, 1, 2, 3, 3, 1, 2, 0])
};
export function Plane() {
return plane;
}
export function PlaneCage() {
return planeCage;
}
//
export function SegmentedPlane(widthSegments, heightSegments) {
const widthSegments1 = widthSegments + 1;
const heightSegments1 = heightSegments + 1;
const segmentWidth = 1 / widthSegments;
const segmentHeight = 1 / heightSegments;
const vertices = new Float32Array(widthSegments1 * heightSegments1 * 3);
const normals = new Float32Array(widthSegments1 * heightSegments1 * 3);
const indices = new Uint32Array(widthSegments * heightSegments * 6);
let i = 0;
for (let iy = 0; iy < heightSegments1; ++iy) {
const y = iy * segmentHeight - 0.5;
for (let ix = 0; ix < widthSegments1; ++ix) {
const x = ix * segmentWidth - 0.5;
vertices[i] = x;
vertices[i + 1] = -y;
vertices[i + 2] = 0;
normals[i] = 0;
normals[i + 1] = 0;
normals[i + 2] = 1;
i += 3;
}
}
let j = 0;
for (let iy = 0; iy < heightSegments; ++iy) {
for (let ix = 0; ix < widthSegments; ++ix) {
const a = ix + widthSegments1 * iy;
const b = ix + widthSegments1 * (iy + 1);
const c = (ix + 1) + widthSegments1 * (iy + 1);
const d = (ix + 1) + widthSegments1 * iy;
indices[j] = a;
indices[j + 1] = b;
indices[j + 2] = d;
indices[j + 3] = b;
indices[j + 4] = c;
indices[j + 5] = d;
j += 6;
}
}
return { vertices, normals, indices };
}