playcanvas/build/playcanvas.dbg/src/scene/geometry/cylinder-geometry.js

PlayCanvas WebGL game engine

import { ConeBaseGeometry } from './cone-base-geometry.js';
import { calculateTangents } from './geometry-utils.js';

/**
 * A procedural cylinder-shaped geometry.
 *
 * The size, shape and tesselation properties of the cylinder can be controlled via constructor
 * parameters. By default, the function will create a cylinder standing vertically centered on the
 * XZ-plane with a radius of 0.5, a height of 1.0, 1 height segment and 20 cap segments.
 *
 * Note that the cylinder is created with UVs in the range of 0 to 1.
 *
 * @category Graphics
 */ class CylinderGeometry extends ConeBaseGeometry {
    /**
     * Create a new CylinderGeometry instance.
     *
     * @param {object} [opts] - An object that specifies optional inputs for the function as follows:
     * @param {number} [opts.radius] - The radius of the tube forming the body of the cylinder
     * (defaults to 0.5).
     * @param {number} [opts.height] - The length of the body of the cylinder (defaults to 1.0).
     * @param {number} [opts.heightSegments] - The number of divisions along the length of the cylinder
     * (defaults to 5).
     * @param {number} [opts.capSegments] - The number of divisions around the tubular body of the
     * cylinder (defaults to 20).
     * @param {boolean} [opts.calculateTangents] - Generate tangent information (defaults to false).
     */ constructor(opts = {}){
        var _opts_radius;
        // Check the supplied options and provide defaults for unspecified ones
        var radius = (_opts_radius = opts.radius) != null ? _opts_radius : 0.5;
        var _opts_height;
        var height = (_opts_height = opts.height) != null ? _opts_height : 1;
        var _opts_heightSegments;
        var heightSegments = (_opts_heightSegments = opts.heightSegments) != null ? _opts_heightSegments : 5;
        var _opts_capSegments;
        var capSegments = (_opts_capSegments = opts.capSegments) != null ? _opts_capSegments : 20;
        // Create vertex data for a cone that has a base and peak radius that is the same (i.e. a cylinder)
        super(radius, radius, height, heightSegments, capSegments, false);
        if (opts.calculateTangents) {
            this.tangents = calculateTangents(this.positions, this.normals, this.uvs, this.indices);
        }
    }
}

export { CylinderGeometry };