Move benchmark demos into their own directory.

benchmarks3d/joint_ball3.rs

@@ -0,0 +1,70 @@
+use na::Point3;
+use rapier3d::dynamics::{BallJoint, BodyStatus, JointSet, RigidBodyBuilder, RigidBodySet};
+use rapier3d::geometry::{ColliderBuilder, ColliderSet};
+use rapier_testbed3d::Testbed;
+
+pub fn init_world(testbed: &mut Testbed) {
+    /*
+     * World
+     */
+    let mut bodies = RigidBodySet::new();
+    let mut colliders = ColliderSet::new();
+    let mut joints = JointSet::new();
+
+    let rad = 0.4;
+    let num = 100;
+    let shift = 1.0;
+
+    let mut body_handles = Vec::new();
+
+    for k in 0..num {
+        for i in 0..num {
+            let fk = k as f32;
+            let fi = i as f32;
+
+            let status = if i == 0 && (k % 4 == 0 || k == num - 1) {
+                BodyStatus::Static
+            } else {
+                BodyStatus::Dynamic
+            };
+
+            let rigid_body = RigidBodyBuilder::new(status)
+                .translation(fk * shift, 0.0, fi * shift)
+                .build();
+            let child_handle = bodies.insert(rigid_body);
+            let collider = ColliderBuilder::ball(rad).build();
+            colliders.insert(collider, child_handle, &mut bodies);
+
+            // Vertical joint.
+            if i > 0 {
+                let parent_handle = *body_handles.last().unwrap();
+                let joint = BallJoint::new(Point3::origin(), Point3::new(0.0, 0.0, -shift));
+                joints.insert(&mut bodies, parent_handle, child_handle, joint);
+            }
+
+            // Horizontal joint.
+            if k > 0 {
+                let parent_index = body_handles.len() - num;
+                let parent_handle = body_handles[parent_index];
+                let joint = BallJoint::new(Point3::origin(), Point3::new(-shift, 0.0, 0.0));
+                joints.insert(&mut bodies, parent_handle, child_handle, joint);
+            }
+
+            body_handles.push(child_handle);
+        }
+    }
+
+    /*
+     * Set up the testbed.
+     */
+    testbed.set_world(bodies, colliders, joints);
+    testbed.look_at(
+        Point3::new(-110.0, -46.0, 170.0),
+        Point3::new(54.0, -38.0, 29.0),
+    );
+}
+
+fn main() {
+    let testbed = Testbed::from_builders(0, vec![("Joints", init_world)]);
+    testbed.run()
+}