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2D support

· 2 min read
Dragos
Balaur

A second physics world on rapier2d, 2D drawing in z order, a 2D gizmo in the editor, and a slingshot game to prove it.

What landed​

  • A rapier2d world. body2d and collider2d beside body3d and collider3d, over the same scene tree. Both worlds step on the fixed 60 Hz tick with Rapier's enhanced-determinism on, and the 2D world has the same bit-for-bit test the 3D one had.
  • 2D drawing. Shapes draw in z order, so the glasses sit on the pig rather than under it.
  • The editor knows. A scene with 2D components gets a 2D grid, a pan-and-zoom camera and a 2D gizmo: drag an axis, a plane, or the ring.
  • examples/angrynerds. A slingshot, towers, and pigs with glasses, in one scene and one script.
[[nodes]]
name = "Bird"
position = [-8, 2.2, 0]
body2d = "kinematic"

[nodes.shape2d]
kind = "circle"
radius = 0.4

Why a second world​

A 2D game on a 3D physics engine is a 3D game with two axes locked, and every tunnelling bug, joint limit and raycast filter knows it. rapier2d is Rapier's own 2D solver, shapes and determinism. Nothing about the 3D path changed.

balaur edit examples/angrynerds, or play it in the browser. Manual: Physics, The editor.