Script: Examle in TypeScript

Type: typescript
Project: Parametric lamp hood model
Author: bitbybit
Date Created: Mar 19, 2021, 12:05:46 PM
Last Edit Date: Dec 5, 2023, 8:00:36 PM

Project Information

This example demonstrates how parametric 3D model can be produced by using NURBS framework and CAD features of BitByBit platform. Parametric lamp model can also be saved to STL format and 3D printed.

View Full Project

Script Code

const Inputs = Bit.Inputs;

let start = async () => {

    const isocurveSegments = 70;
    const isocurveSubdivisions = 41;
    const verticalIsocurveRadius = 0.1;
    const downloadStl = false;

    const profiles = [
        bitbybit.verb.curve.ellipse.createEllipse({
            center: [0, 0, 0],
            xAxis: [2, -0.5, 2],
            yAxis: [0, -0.5, 2],
        }),
        bitbybit.verb.curve.ellipse.createEllipse({
            center: [0, 3, 0],
            xAxis: [2, 0, 0],
            yAxis: [0, 0, 4],
        }),
        bitbybit.verb.curve.ellipse.createEllipse({
            center: [0, 6, 0],
            xAxis: [4, 0, 0],
            yAxis: [0, 0, 2],
        }),
        bitbybit.verb.curve.ellipse.createEllipse({
            center: [0, 12, 0],
            xAxis: [1, 0, 0],
            yAxis: [0, 0, 2],
        }),
        bitbybit.verb.curve.ellipse.createEllipse({
            center: [0, 16, 0],
            xAxis: [2, 0.5, 0],
            yAxis: [0, 0.5, 2],
        }),
    ];

    const surface = bitbybit.verb.surface.createSurfaceByLoftingCurves({
        curves: profiles,
        degreeV: 3,
    });

    const allIsocurves = bitbybit.verb.surface.isocurvesSubdivision({
        surface,
        isocurveSegments,
        includeFirst: true,
        includeLast: true,
        useV: false,
    });

    const hullSolids = await Promise.all(allIsocurves.map(async (curve) => {
        const centers = bitbybit.verb.curve.divideByEqualArcLengthToPoints({
            curve,
            subdivision: isocurveSubdivisions,
        });
        const spheres = await bitbybit.jscad.shapes.spheresOnCenterPoints({
            centers,
            radius: verticalIsocurveRadius,
            segments: 4,
        });
        return bitbybit.jscad.hulls.hullChain({
            meshes: spheres,
        });
    }));

    const drawSolidsInput = new Inputs.Draw.DrawBasicGeometryOptions();
    drawSolidsInput.colours = '#ffffff';
    await bitbybit.draw.drawAnyAsync({ entity: hullSolids, options: drawSolidsInput });

    if (downloadStl) {
        await bitbybit.jscad.downloadSolidsSTL({
            meshes: hullSolids,
            fileName: 'bitbybit-model',
        });
    }
}

start();

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