feat: add a few more debug demos

examples3d/debug_pop3.rs

@@ -0,0 +1,42 @@
+use rapier3d::prelude::*;
+use rapier_testbed3d::Testbed;
+
+pub fn init_world(testbed: &mut Testbed) {
+    /*
+     * World
+     */
+    let mut bodies = RigidBodySet::new();
+    let mut colliders = ColliderSet::new();
+    let impulse_joints = ImpulseJointSet::new();
+    let multibody_joints = MultibodyJointSet::new();
+
+    /*
+     * Ground
+     */
+    let ground_size = 10.0;
+    let ground_height = 10.0;
+
+    for _ in 0..1 {
+        let rigid_body = RigidBodyBuilder::fixed().translation(vector![0.0, -ground_height, 0.0]);
+        let handle = bodies.insert(rigid_body);
+        let collider = ColliderBuilder::cuboid(ground_size, ground_height, ground_size);
+        colliders.insert_with_parent(collider, handle, &mut bodies);
+    }
+
+    // Build the dynamic box rigid body.
+    for _ in 0..1 {
+        let rigid_body = RigidBodyBuilder::dynamic()
+            // .translation(vector![0.0, 0.1, 0.0])
+            // .rotation(vector![0.8, 0.2, 0.1])
+            .can_sleep(false);
+        let handle = bodies.insert(rigid_body);
+        let collider = ColliderBuilder::cuboid(1.0, 1.0, 1.0);
+        colliders.insert_with_parent(collider.clone(), handle, &mut bodies);
+    }
+
+    /*
+     * Set up the testbed.
+     */
+    testbed.set_world(bodies, colliders, impulse_joints, multibody_joints);
+    testbed.look_at(point![10.0, 10.0, 10.0], Point::origin());
+}