physics: cylinder hitbox

engine/physics/src/model.rs

@@ -215,7 +215,42 @@ impl PhysicsMesh{
 		}
 	}
 	pub fn unit_cylinder()->Self{
-		Self::unit_cube()
+		const N:usize=24;
+		let mut mb=model::MeshBuilder::new();
+		let color=mb.acquire_color_id(model::Color4::ONE);
+		let tex=mb.acquire_tex_id(model::TextureCoordinate::ZERO);
+		let normal=mb.acquire_normal_id(vec3::ZERO);
+		let mut verts=Vec::with_capacity(2*N);
+		for i in 0..N{
+			let (x,z)=integer::Angle32::raw((integer::Angle32::PI.get() as usize*i/N) as i32).cos_sin();
+			//top
+			let pos=mb.acquire_pos_id(Planar64Vec3::new([x,Planar64::ONE,z]));
+			verts.push(mb.acquire_vertex_id(model::IndexedVertex{pos,color,tex,normal}));
+			//bottom
+			let pos=mb.acquire_pos_id(Planar64Vec3::new([x,Planar64::NEG_ONE,z]));
+			verts.push(mb.acquire_vertex_id(model::IndexedVertex{pos,color,tex,normal}));
+		}
+		let mut polygon_list=Vec::with_capacity(N+2);
+		// side faces
+		for i in 0..N{
+			polygon_list.push(vec![
+				verts[i*2],
+				verts[(i*2+2)%N],
+				verts[(i*2+3)%N],
+				verts[(i*2+1)%N],
+			]);
+		}
+		// top face
+		polygon_list.push((0..N).map(|i|verts[2*i]).collect());
+		// bottom face
+		polygon_list.push((0..N).map(|i|verts[2*i+1]).collect());
+		let polygon_groups=vec![model::PolygonGroup::PolygonList(model::PolygonList::new(polygon_list))];
+		let graphics_groups=vec![];
+		let physics_groups=vec![model::IndexedPhysicsGroup{
+			groups:vec![model::PolygonGroupId::new(0)],
+		}];
+		let mesh=&mb.build(polygon_groups,graphics_groups,physics_groups);
+		mesh.try_into().unwrap()
 	}
 	#[inline]
 	pub const fn complete_mesh(&self)->&PhysicsMeshTopology{