---
jupyter:
  description: 'Solids from planex2d geometry: Pad and Pocket extrude faces and sketches into OpenCASCADE solids and
    cut them out, up to a length, a plane or a face, with the names of the profile on the faces of the solid.'
---

# 3D

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<a href="../../core/3d/pad-pocket.html" style="width: 35.6%"><img src="../../_static/sections/3d/pad-pocket.png" alt="Pad and Pocket"><span>Pad and Pocket</span></a>
<a href="../../examples/prince-ruperts-cube.html" style="width: 25.5%"><img src="../../_static/gallery/prince-ruperts-cube.png" alt="A unit cube with a square tunnel through which a larger cube passes"><span><em class="px-tag">Example</em> Prince Rupert's cube: a cube through a cube</span></a>
<a href="../../examples/vaults.html" style="width: 34.9%"><img src="../../_static/gallery/vaults.png" alt="A cross vault and the Steinmetz solids of its barrels"><span><em class="px-tag">Example</em> Vaults and Steinmetz solids</span></a>
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- [Pad and Pocket](pad-pocket.md)
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planex2d is a 2D kernel, but every face and sketch lies on a plane that can be placed anywhere in 3D, and it becomes a
solid in OpenCASCADE. `px.Pad` extrudes a face, a shape or a sketch into a solid, and `px.Pocket` cuts such an
extrusion out of a solid, either by a length or up to a plane or a face. The side faces of the solid carry the names of
the profile edges they come from, so they can be selected by name for meshing and boundary conditions.

A flat face of a solid works wherever planex2d takes a plane. A sketch is drawn on it with `px.Sketch(face)`, and a
pocket runs up to it with `until=face`, so the next feature of a part is built on the faces of the last one. Solids
need the OpenCASCADE bindings, the optional package planex2d-occ (`pip install "planex2d[occ]"`, which brings netgen).

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<p class="px-label">In this section</p>
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<div class="px-cards">
<a class="px-card" href="pad-pocket.html"><div class="thumb"><img src="../../_static/sections/3d/pad-pocket.png" alt="Pad and Pocket"></div><b>Pad and Pocket</b><span>Solids from faces and sketches, extruded and cut with OpenCASCADE, named after the profile.</span></a>
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## Everything at a glance

| | |
|---|---|
| **Pad** | `px.Pad(profile, length, length2=0)`, or `until=` a plane, a face, or a planex2d face, shape or sketch |
| **Pocket** | `px.Pocket(target, profile, length)`, or `until=` as for Pad, and `px.first` or `px.last`, the first or last flat face of the target along the direction |
| **Direction** | The plane's normal by default, for a pocket its negative; `dir=` any direction that leaves the plane, `reverse=True` the other way |
| **Sketches on solids** | `px.Sketch(face)`, `px.QuickSketch(face)` and `px.Plane(face)` on a flat face of a solid |

See [Placing a sketch](../sketch/placement.md) for sketches on the faces of solids, and
[OpenCASCADE](../../integrations/occ/index.md) for lofts, projections and sections of solids.