Change the speed of the agent dynamically

[kevinNejad]

Hi,
I'm wondering if it is possible to modify the speed in which the agent walks/runs dynamically/programmatically ?
For example, speed up/down according to a function while the agent is interacting in the environment.

Thank you very much for your support,

[krtimisra67]

yes u can

1. Unity (C#)
   In Unity, you can modify the agent's speed by adjusting its NavMeshAgent or CharacterController speed dynamically:
   Example
   using UnityEngine;
   using UnityEngine.AI;

public class AgentSpeedControl : MonoBehaviour
{
public NavMeshAgent agent;
public float baseSpeed = 3.5f;
public float speedMultiplier = 2.0f;
private float timeElapsed = 0f;

void Start()
{
    agent.speed = baseSpeed;
}

void Update()
{
    timeElapsed += Time.deltaTime;
    agent.speed = baseSpeed + Mathf.Sin(timeElapsed) * speedMultiplier;
}

}

2. Unreal Engine (Blueprint or C++)
   In Unreal Engine, you can modify an AI agent's speed by adjusting its Max Walk Speed dynamically.
   Blueprint Approach:
   • In the AI Character's Event Graph, use Set Max Walk Speed and connect it to an event (like a timer or input).

c++ approach
void AMyAICharacter::AdjustSpeed(float DeltaTime)
{
float NewSpeed = BaseSpeed + FMath::Sin(GetWorld()->TimeSeconds) * SpeedMultiplier;
GetCharacterMovement()->MaxWalkSpeed = NewSpeed;
}

3. OpenAI Gym / Reinforcement Learning Environments
   If you're using reinforcement learning environments like OpenAI Gym, you can modify an agent’s speed based on observations or a function:
   Example
   class CustomEnv(gym.Env):
   def step(self, action):
   speed = base_speed + np.sin(self.time_elapsed) * speed_multiplier
   self.agent.velocity = speed * action # Modify movement dynamics

4. Robotics (ROS, Gazebo)
   For robotic agents (like in Gazebo/ROS):
   from geometry_msgs.msg import Twist

vel_msg = Twist()
vel_msg.linear.x = base_speed + math.sin(rospy.get_time()) * speed_multiplier
cmd_vel_publisher.publish(vel_msg)