Bevy adapt 2D to 3D

When to use

Load this when a 2D design should gain a 3D camera and meshes. Keep gameplay components. Swap the camera and the drawable.

ECS shape

• Cameras: Camera2d and Camera3d are already documented on bevy-camera-systems. An entity should not keep both as if they were one camera mode unless that skill says so.
• Draw: Sprite is 2D. Meshes and StandardMaterial are 3D (bevy-3d-materials).
• Features: the crate page separates 2d and 3d profiles. Enabling 3D does not delete 2D types.
• Motion: bevy-character-movement stays the locomotion skill. A 3D velocity is still your component until a solver exists.

What changes

Keep	Replace
Gameplay components on the actor	Sprite with Mesh3d and MeshMaterial3d
The camera entity	Camera2d with Camera3d and a perspective Projection
Planar motion as data	Vec2 velocity with a Vec3 wish on XZ

There is no conversion helper. A startup system rewrites the entities you already spawned. Physics solvers stay on the physics skills.

[dependencies]
bevy = "0.20"

use bevy::mesh::Meshable;

#[derive(Component)]
struct Actor;

#[derive(Component)]
struct PlanarVelocity(Vec2);

#[derive(Component)]
struct WishVelocity(Vec3);