andreacatania / amethyst_physics Goto Github PK

I get this error:

error[E0277]: the trait bound `PhysicsBundle<'_, '_, f32, NPhysicsBackend>: SystemBundle<'_, '_>` is not satisfied
   --> src\main.rs:227:22
    |
227 |         .with_bundle(PhysicsBundle::<f32, NPhysicsBackend>::new()).unwrap()
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `SystemBundle<'_, '_>` is not implemented for `PhysicsBundle<'_, '_, f32, NPhysicsBackend>`

And I import these types in as such:

use amethyst_physics::PhysicsBundle;
use amethyst_nphysics::NPhysicsBackend;

The reason why I do that is because I think NPhysicsBackend was moved out of amethyst a while ago. Any clue what's up?

I'm in need of using the rustsim salva2d and nphysics2d libraries. It seems like the amethyst_physics nphysics back end only supports nphysics3d. I'm thinking about adding a back end for salva2d and nphysics2d. Should I expect any significant challenges with this, or should it be straight forward to follow the pattern set by the amethyst_physics nphysics back end?

You should be able to use a feature named something like "backend-nphysics" to have NPhysicsBackend included directly in the crate (for convenience).

Is it possible to add a RigidBodyDesc and ShapeDesc to a component in a prefab ron file?

Hi! I have tried to extend your example with falling cubes amethyst_physics_test with a flat terrain mesh instead of the floor.

Terrain mesh is a 8.0x8.0 sqare built from 128 triangles. I've also prepared a ShapeDesc for it from the same vertices and indices.

Here comes the first question: MeshBuilder and ShapeDesc::TriMesh expect vectors with different content:

error[E0308]: mismatched types
  --> src/terrain.rs:63:21
   |
63 |             points: pos,
   |                     ^^^ expected struct `nalgebra::geometry::point::Point`, found struct `rendy_util::types::vertex::Position`
   |
   = note: expected struct `std::vec::Vec<nalgebra::geometry::point::Point<_, nalgebra::base::dimension::U3>>`
              found struct `std::vec::Vec<rendy_util::types::vertex::Position>`

error[E0308]: mismatched types
  --> src/terrain.rs:64:22
   |
64 |             indices: idx,
   |                      ^^^ expected struct `nalgebra::geometry::point::Point`, found `u16`
   |
   = note: expected struct `std::vec::Vec<nalgebra::geometry::point::Point<usize, nalgebra::base::dimension::U3>>`
              found struct `std::vec::Vec<u16>`

How it is intended to do? At this moment I simply fill out two more vectors with the same values, but it does not feel right

And second thing is that as soon as I do it, it works as expected, but I have a heavy FPS drop when cubes collide. Any idea from what point should I start my investigation?

Methods for adding systems to PhysicsBundle should accept &str and &[], in stead of String and Vec, to be consistent with Amethyst.

Dependencies does not work between systems added to GameData and systems added to the physics bundle, for example using PhysicsBundle::with_pre_physics().
This makes it very difficult to use the input bundle, for example, as there is no obvious way to get input_system to run before any character controllers that are added to the PhysicsBundle in stead of GameData...