geo/SDFBox2D

Creates a rectangle as a 2D SDF field in the XY plane, the same plane the M2D nodes, SVG and flat text use. It displays as a distance-field visualization on its bounds: warm outside, cool inside, distance bands, and a white isoline on the shape itself. Compose it with other 2D SDF objects through geo/SDFBoolean and geo/SDFRepeat, then turn it into a 3D field with geo/SDFExtrude or geo/SDFRevolve, or into real geometry with geo/SDFTriangulate, which gives a 2D field its outline as segments or as a 2D manifold. 2D and 3D SDF objects cannot combine directly. The `t` and `size` params are in plane coordinates: x is world X, y is world Y.