First public release of Rapier.v0.1.0

1 files changed, 373 insertions, 0 deletions

diff --git a/src/geometry/collider.rs b/src/geometry/collider.rs
new file mode 100644
index 0000000..2457212
--- /dev/null
+++ b/src/geometry/collider.rs
@@ -0,0 +1,373 @@
+use crate::dynamics::{MassProperties, RigidBodyHandle, RigidBodySet};
+use crate::geometry::{
+    Ball, Capsule, ColliderGraphIndex, Contact, Cuboid, HeightField, InteractionGraph, Polygon,
+    Proximity, Triangle, Trimesh,
+};
+use crate::math::{Isometry, Point, Vector};
+use na::Point3;
+use ncollide::bounding_volume::{HasBoundingVolume, AABB};
+use num::Zero;
+
+#[derive(Clone)]
+#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
+/// An enum grouping all the possible shape of a collider.
+pub enum Shape {
+    /// A ball shape.
+    Ball(Ball),
+    /// A convex polygon shape.
+    Polygon(Polygon),
+    /// A cuboid shape.
+    Cuboid(Cuboid),
+    /// A capsule shape.
+    Capsule(Capsule),
+    /// A triangle shape.
+    Triangle(Triangle),
+    /// A triangle mesh shape.
+    Trimesh(Trimesh),
+    /// A heightfield shape.
+    HeightField(HeightField),
+}
+
+impl Shape {
+    /// Gets a reference to the underlying ball shape, if `self` is one.
+    pub fn as_ball(&self) -> Option<&Ball> {
+        match self {
+            Shape::Ball(b) => Some(b),
+            _ => None,
+        }
+    }
+
+    /// Gets a reference to the underlying polygon shape, if `self` is one.
+    pub fn as_polygon(&self) -> Option<&Polygon> {
+        match self {
+            Shape::Polygon(p) => Some(p),
+            _ => None,
+        }
+    }
+
+    /// Gets a reference to the underlying cuboid shape, if `self` is one.
+    pub fn as_cuboid(&self) -> Option<&Cuboid> {
+        match self {
+            Shape::Cuboid(c) => Some(c),
+            _ => None,
+        }
+    }
+
+    /// Gets a reference to the underlying capsule shape, if `self` is one.
+    pub fn as_capsule(&self) -> Option<&Capsule> {
+        match self {
+            Shape::Capsule(c) => Some(c),
+            _ => None,
+        }
+    }
+
+    /// Gets a reference to the underlying triangle mesh shape, if `self` is one.
+    pub fn as_trimesh(&self) -> Option<&Trimesh> {
+        match self {
+            Shape::Trimesh(c) => Some(c),
+            _ => None,
+        }
+    }
+
+    /// Gets a reference to the underlying heightfield shape, if `self` is one.
+    pub fn as_heightfield(&self) -> Option<&HeightField> {
+        match self {
+            Shape::HeightField(h) => Some(h),
+            _ => None,
+        }
+    }
+
+    /// Gets a reference to the underlying triangle shape, if `self` is one.
+    pub fn as_triangle(&self) -> Option<&Triangle> {
+        match self {
+            Shape::Triangle(c) => Some(c),
+            _ => None,
+        }
+    }
+
+    /// Computes the axis-aligned bounding box of this shape.
+    pub fn compute_aabb(&self, position: &Isometry<f32>) -> AABB<f32> {
+        match self {
+            Shape::Ball(ball) => ball.bounding_volume(position),
+            Shape::Polygon(poly) => poly.aabb(position),
+            Shape::Capsule(caps) => caps.aabb(position),
+            Shape::Cuboid(cuboid) => cuboid.bounding_volume(position),
+            Shape::Triangle(triangle) => triangle.bounding_volume(position),
+            Shape::Trimesh(trimesh) => trimesh.aabb(position),
+            Shape::HeightField(heightfield) => heightfield.bounding_volume(position),
+        }
+    }
+}
+
+#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
+/// A geometric entity that can be attached to a body so it can be affected by contacts and proximity queries.
+///
+/// To build a new collider, use the `ColliderBuilder` structure.
+pub struct Collider {
+    shape: Shape,
+    density: f32,
+    is_sensor: bool,
+    pub(crate) parent: RigidBodyHandle,
+    pub(crate) delta: Isometry<f32>,
+    pub(crate) position: Isometry<f32>,
+    pub(crate) predicted_position: Isometry<f32>,
+    /// The friction coefficient of this collider.
+    pub friction: f32,
+    /// The restitution coefficient of this collider.
+    pub restitution: f32,
+    pub(crate) contact_graph_index: ColliderGraphIndex,
+    pub(crate) proximity_graph_index: ColliderGraphIndex,
+    pub(crate) proxy_index: usize,
+}
+
+impl Clone for Collider {
+    fn clone(&self) -> Self {
+        Self {
+            shape: self.shape.clone(),
+            parent: RigidBodySet::invalid_handle(),
+            contact_graph_index: ColliderGraphIndex::new(crate::INVALID_U32),
+            proximity_graph_index: ColliderGraphIndex::new(crate::INVALID_U32),
+            proxy_index: crate::INVALID_USIZE,
+            ..*self
+        }
+    }
+}
+
+impl Collider {
+    /// The rigid body this collider is attached to.
+    pub fn parent(&self) -> RigidBodyHandle {
+        self.parent
+    }
+
+    /// Is this collider a sensor?
+    pub fn is_sensor(&self) -> bool {
+        self.is_sensor
+    }
+
+    #[doc(hidden)]
+    pub fn set_position_debug(&mut self, position: Isometry<f32>) {
+        self.position = position;
+    }
+
+    /// The position of this collider expressed in the local-space of the rigid-body it is attached to.
+    pub fn delta(&self) -> &Isometry<f32> {
+        &self.delta
+    }
+
+    /// The world-space position of this collider.
+    pub fn position(&self) -> &Isometry<f32> {
+        &self.position
+    }
+
+    /// The density of this collider.
+    pub fn density(&self) -> f32 {
+        self.density
+    }
+
+    /// The geometric shape of this collider.
+    pub fn shape(&self) -> &Shape {
+        &self.shape
+    }
+
+    /// Compute the axis-aligned bounding box of this collider.
+    pub fn compute_aabb(&self) -> AABB<f32> {
+        self.shape.compute_aabb(&self.position)
+    }
+
+    // pub(crate) fn compute_aabb_with_prediction(&self) -> AABB<f32> {
+    //     let aabb1 = self.shape.compute_aabb(&self.position);
+    //     let aabb2 = self.shape.compute_aabb(&self.predicted_position);
+    //     aabb1.merged(&aabb2)
+    // }
+
+    /// Compute the local-space mass properties of this collider.
+    pub fn mass_properties(&self) -> MassProperties {
+        match &self.shape {
+            Shape::Ball(ball) => MassProperties::from_ball(self.density, ball.radius),
+            #[cfg(feature = "dim2")]
+            Shape::Polygon(p) => MassProperties::from_polygon(self.density, p.vertices()),
+            #[cfg(feature = "dim3")]
+            Shape::Polygon(_p) => unimplemented!(),
+            Shape::Cuboid(c) => MassProperties::from_cuboid(self.density, c.half_extents),
+            Shape::Capsule(caps) => {
+                MassProperties::from_capsule(self.density, caps.a, caps.b, caps.radius)
+            }
+            Shape::Triangle(_) => MassProperties::zero(),
+            Shape::Trimesh(_) => MassProperties::zero(),
+            Shape::HeightField(_) => MassProperties::zero(),
+        }
+    }
+}
+
+/// A structure responsible for building a new collider.
+#[derive(Clone)]
+#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
+pub struct ColliderBuilder {
+    /// The shape of the collider to be built.
+    pub shape: Shape,
+    /// The density of the collider to be built.
+    pub density: f32,
+    /// The friction coefficient of the collider to be built.
+    pub friction: f32,
+    /// The restitution coefficient of the collider to be built.
+    pub restitution: f32,
+    /// The position of this collider relative to the local frame of the rigid-body it is attached to.
+    pub delta: Isometry<f32>,
+    /// Is this collider a sensor?
+    pub is_sensor: bool,
+}
+
+impl ColliderBuilder {
+    /// Initialize a new collider builder with the given shape.
+    pub fn new(shape: Shape) -> Self {
+        Self {
+            shape,
+            density: 1.0,
+            friction: Self::default_friction(),
+            restitution: 0.0,
+            delta: Isometry::identity(),
+            is_sensor: false,
+        }
+    }
+
+    /// Initialize a new collider builder with a ball shape defined by its radius.
+    pub fn ball(radius: f32) -> Self {
+        Self::new(Shape::Ball(Ball::new(radius)))
+    }
+
+    /// Initialize a new collider builder with a cuboid shape defined by its half-extents.
+    #[cfg(feature = "dim2")]
+    pub fn cuboid(hx: f32, hy: f32) -> Self {
+        let cuboid = Cuboid {
+            half_extents: Vector::new(hx, hy),
+        };
+
+        Self::new(Shape::Cuboid(cuboid))
+
+        /*
+        use crate::math::Point;
+        let vertices = vec![
+            Point::new(hx, -hy),
+            Point::new(hx, hy),
+            Point::new(-hx, hy),
+            Point::new(-hx, -hy),
+        ];
+        let normals = vec![Vector::x(), Vector::y(), -Vector::x(), -Vector::y()];
+        let polygon = Polygon::new(vertices, normals);
+
+        Self::new(Shape::Polygon(polygon))
+        */
+    }
+
+    /// Initialize a new collider builder with a capsule shape aligned with the `x` axis.
+    pub fn capsule_x(half_height: f32, radius: f32) -> Self {
+        let capsule = Capsule::new_x(half_height, radius);
+        Self::new(Shape::Capsule(capsule))
+    }
+
+    /// Initialize a new collider builder with a capsule shape aligned with the `y` axis.
+    pub fn capsule_y(half_height: f32, radius: f32) -> Self {
+        let capsule = Capsule::new_y(half_height, radius);
+        Self::new(Shape::Capsule(capsule))
+    }
+
+    /// Initialize a new collider builder with a capsule shape aligned with the `z` axis.
+    #[cfg(feature = "dim3")]
+    pub fn capsule_z(half_height: f32, radius: f32) -> Self {
+        let capsule = Capsule::new_z(half_height, radius);
+        Self::new(Shape::Capsule(capsule))
+    }
+
+    /// Initialize a new collider builder with a cuboid shape defined by its half-extents.
+    #[cfg(feature = "dim3")]
+    pub fn cuboid(hx: f32, hy: f32, hz: f32) -> Self {
+        let cuboid = Cuboid {
+            half_extents: Vector::new(hx, hy, hz),
+        };
+
+        Self::new(Shape::Cuboid(cuboid))
+    }
+
+    /// Initializes a collider builder with a segment shape.
+    ///
+    /// A segment shape is modeled by a capsule with a 0 radius.
+    pub fn segment(a: Point<f32>, b: Point<f32>) -> Self {
+        let capsule = Capsule::new(a, b, 0.0);
+        Self::new(Shape::Capsule(capsule))
+    }
+
+    /// Initializes a collider builder with a triangle shape.
+    pub fn triangle(a: Point<f32>, b: Point<f32>, c: Point<f32>) -> Self {
+        let triangle = Triangle::new(a, b, c);
+        Self::new(Shape::Triangle(triangle))
+    }
+
+    /// Initializes a collider builder with a triangle mesh shape defined by its vertex and index buffers.
+    pub fn trimesh(vertices: Vec<Point<f32>>, indices: Vec<Point3<u32>>) -> Self {
+        let trimesh = Trimesh::new(vertices, indices);
+        Self::new(Shape::Trimesh(trimesh))
+    }
+
+    /// Initializes a collider builder with a heightfield shape defined by its set of height and a scale
+    /// factor along each coordinate axis.
+    #[cfg(feature = "dim2")]
+    pub fn heightfield(heights: na::DVector<f32>, scale: Vector<f32>) -> Self {
+        let heightfield = HeightField::new(heights, scale);
+        Self::new(Shape::HeightField(heightfield))
+    }
+
+    /// Initializes a collider builder with a heightfield shape defined by its set of height and a scale
+    /// factor along each coordinate axis.
+    #[cfg(feature = "dim3")]
+    pub fn heightfield(heights: na::DMatrix<f32>, scale: Vector<f32>) -> Self {
+        let heightfield = HeightField::new(heights, scale);
+        Self::new(Shape::HeightField(heightfield))
+    }
+
+    /// The default friction coefficient used by the collider builder.
+    pub fn default_friction() -> f32 {
+        0.5
+    }
+
+    /// Sets whether or not the collider built by this builder is a sensor.
+    pub fn sensor(mut self, is_sensor: bool) -> Self {
+        self.is_sensor = is_sensor;
+        self
+    }
+
+    /// Sets the friction coefficient of the collider this builder will build.
+    pub fn friction(mut self, friction: f32) -> Self {
+        self.friction = friction;
+        self
+    }
+
+    /// Sets the density of the collider this builder will build.
+    pub fn density(mut self, density: f32) -> Self {
+        self.density = density;
+        self
+    }
+
+    /// Set the position of this collider in the local-space of the rigid-body it is attached to.
+    pub fn delta(mut self, delta: Isometry<f32>) -> Self {
+        self.delta = delta;
+        self
+    }
+
+    /// Buildes a new collider attached to the given rigid-body.
+    pub fn build(&self) -> Collider {
+        Collider {
+            shape: self.shape.clone(),
+            density: self.density,
+            friction: self.friction,
+            restitution: self.restitution,
+            delta: self.delta,
+            is_sensor: self.is_sensor,
+            parent: RigidBodySet::invalid_handle(),
+            position: Isometry::identity(),
+            predicted_position: Isometry::identity(),
+            contact_graph_index: InteractionGraph::<Contact>::invalid_graph_index(),
+            proximity_graph_index: InteractionGraph::<Proximity>::invalid_graph_index(),
+            proxy_index: crate::INVALID_USIZE,
+        }
+    }
+}