update vertical damping & add rigidbody:get_vdamping

src/physics/Hitbox.hpp

@@ -54,7 +54,7 @@ struct Hitbox {
     glm::vec3 velocity;
     float linearDamping = 0.5;
     float friction = 1.0f;
-    bool verticalDamping = false;
+    float verticalDamping = 1.0f;
     bool grounded = false;
     float gravityScale = 1.0f;
     bool crouching = false;

src/physics/PhysicsSolver.cpp

@@ -86,8 +86,8 @@ void PhysicsSolver::step(
     }
     vel.x /= 1.0f + delta * linearDamping;
     vel.z /= 1.0f + delta * linearDamping;
-    if (hitbox.verticalDamping) {
-        vel.y /= 1.0f + delta * linearDamping;
+    if (hitbox.verticalDamping > 0.0f) {
+        vel.y /= 1.0f + delta * linearDamping * hitbox.verticalDamping;
     }
 
     AABB aabb;