Build a drone: payload and sizes

The last parts hang under the frame: a camera on its gimbal and the battery in its straps. Then one number shows what the functions were written for.

1. The payload hangs under the frame: a camera on its gimbal at the front, its lens in glass, and the battery in two straps.

   • Make parts/payload.ts:

   export async function gimbal() {
       const outline = await bitbybit.occt.shapes.wire.createPolygonWire({ points: [[-4, 19, -4], [19.5, 19, -4], [19.5, -7, -4], [14.5, -7, -4], [14.5, 15, -4], [-4, 15, -4]] });
       const rounded = await bitbybit.occt.fillets.fillet2d({ shape: outline, radius: 1.5 });
       const face = await bitbybit.occt.shapes.face.createFaceFromWire({ shape: rounded, planar: true });
       const bracket = await bitbybit.occt.operations.extrude({ shape: face, direction: [0, 0, 8] });
       const yaw = await bitbybit.occt.shapes.solid.createCylinder({ radius: 9, height: 8, center: [0, 18, 0], direction: [0, 1, 0] });
       const roll = await bitbybit.occt.shapes.solid.createCylinder({ radius: 6, height: 5, center: [14.5, 0, 0], direction: [-1, 0, 0] });
       const whole = await bitbybit.occt.booleans.union({ shapes: [yaw, bracket, roll], keepEdges: false });
       return bitbybit.occt.transforms.translate({ shape: whole, translation: [0, -26, 55] });
   }
   
   export async function camera() {
       const box = await bitbybit.occt.shapes.solid.createBox({ width: 24, length: 20, height: 18, center: [0, -26, 55] });
       const body = await bitbybit.occt.fillets.filletEdges({ shape: box, radius: 3 });
       const barrel = await bitbybit.occt.shapes.solid.createCylinder({ radius: 6.5, height: 9, center: [0, -26, 63], direction: [0, 0, 1] });
       return {
           camera: await bitbybit.occt.booleans.union({ shapes: [body, barrel], keepEdges: false }),
           lens: await bitbybit.occt.shapes.solid.createCylinder({ radius: 5.2, height: 1.5, center: [0, -26, 71.5], direction: [0, 0, 1] }),
       };
   }
   
   export async function battery() {
       const box = await bitbybit.occt.shapes.solid.createBox({ width: 36, length: 72, height: 26, center: [0, -16, -20] });
       return bitbybit.occt.fillets.filletEdges({ shape: box, radius: 3 });
   }
   
   export async function straps() {
       const outer = await bitbybit.occt.shapes.solid.createBox({ width: 40, length: 10, height: 30, center: [0, 0, 0] });
       const inner = await bitbybit.occt.shapes.solid.createBox({ width: 36.5, length: 12, height: 26.5, center: [0, 0, 0] });
       const strap = await bitbybit.occt.booleans.difference({ shape: outer, shapes: [inner], keepEdges: false });
       const pair: Bit.Inputs.OCCT.TopoDSShapePointer[] = [];
       for (const z of [-42, 2]) {
           pair.push(await bitbybit.occt.transforms.translate({ shape: strap, translation: [0, -16, z] }));
       }
       return bitbybit.occt.shapes.compound.makeCompound({ shapes: pair });
   }

   • Import at the top of main.ts:

   import { battery, camera, gimbal, straps } from "./parts/payload";

   • Add at the end of main.ts:

   const view = await camera();
   await draw(looks.aluminium, await gimbal());
   await draw(looks.polymer, [view.camera, await battery()]);
   await draw(looks.glass, view.lens);
   await draw(looks.accent, await straps());

   • Run it with Run The Code.
   

2. Change one number: with six arms the drone rebuilds, everything around repeats follows, and the propeller shrinks to fit between its neighbours.

   • In sizes.ts, change arms: 4, to arms: 6,.
   • Run it with Run The Code.
   

The finished script is also the TypeScript showcase, to download and open.