A SketchPlane3d represents a 2D planar coordinate system in 3D space, and is defined by its origin point and X and Y directions (which are always perpendicular to each other). Sketch planes are the primary tool for converting back and forth between 2D and 3D coordinates:

• 3D geometry such as points, directions and line segments can be projected into a sketch plane, which effectively projects the geometry onto the sketch plane and then expresses the projected geometry in 2D coordinates.
• 2D geometry can be place onto a sketch plane to result in 3D geometry. For example, a 2D point placed onto a sketch plane will result in a 3D point on that sketch plane that has the given 2D coordinate in the sketch plane.

This allows you to create algorithms that project from 3D into 2D, perform some calculations in 2D, then convert the result back to 3D.

Many 3D data types have projectInto functions that return the corresponding 2D data type, and on functions for converting back to 3D. For example, Triangle3d.projectInto returns a Triangle2d and Triangle3d.on returns a Triangle3d.

Constants

These predefined sketch planes all have the global origin point as their origin point, and use the two indicated global axes as their X and Y axes.

Constructors

Sketch planes can also be constructed from Frame3d values using Frame3d.xySketchPlane etc.

Conversions

Properties

Transformations

Coordinate conversions