Modifications

In addition to the shape transformations and shape combinations, it is also possible to apply some advanced modifications to shapes. These modifications use finders to filter out which face or edges they need.

Fillet and chamfer

Adding fillet (rounded edges) and chamfers (beveled edges) is a very common operation when modelling in 3D. These operations are mainly configured by their radius.

const { drawRoundedRectangle } = replicad;
const main = () => {
  return drawRoundedRectangle(30, 50).sketchOnPlane().extrude(20).fillet(2);
};

When configuring a fillet with a number, all the edges of the shape will be filleted.

If you want to target specific edges you will need to configure a finder within a filter configuration. For instance to fillet only the top edges:

const { drawRoundedRectangle } = replicad;
const main = () => {
  return drawRoundedRectangle(30, 50)
    .sketchOnPlane()
    .extrude(20)
    .fillet(2, (e) => e.inPlane("XY", 20));
};

Multiple radii

What if you want to apply different radii for different edges? You can use a function that will combine filter configurations.

In this case we want to have a bigger fillet on the sides of the box and a small one at the top. You might have been able to do this with two different fillet operations, but in some cases the kernel has more difficulties finding a good solution with multiple operations.

const { drawRoundedRectangle, EdgeFinder, combineFinderFilters } = replicad;
const main = () => {
  const [filters] = combineFinderFilters([
    {
      filter: new EdgeFinder().inPlane("XY", 20),
      radius: 2,
    },
    {
      filter: new EdgeFinder().inDirection("Z"),
      radius: 9,
    },
  ]);

  return drawRoundedRectangle(30, 50)
    .sketchOnPlane()
    .extrude(20)
    .fillet(filters);
};

Shell

With a shell you can hollow out a full shape (keeping a wall of a certain thickness). You need to specify a face that will be hollow, and you configure a finder for this.

const { drawRoundedRectangle } = replicad;
const main = () => {
  return drawRoundedRectangle(30, 50)
    .sketchOnPlane()
    .extrude(20)
    .shell(5, (f) => f.inPlane("XY", 20));
};