ml-agents/unity-environment/Assets/ML-Agents/Examples/3DBall/Scripts/Ball3DDecision.cs

using System.Collections.Generic;
using UnityEngine;
using MLAgents;

public class Ball3DDecision : MonoBehaviour, Decision
{
    public float rotationSpeed = 2f;

    public float[] Decide(
        List<float> vectorObs,
        List<Texture2D> visualObs,
        float reward,
        bool done,
        List<float> memory)
    {
        if (gameObject.GetComponent<Brain>().brainParameters.vectorActionSpaceType
            == SpaceType.continuous)
        {
            List<float> act = new List<float>();

            // state[5] is the velocity of the ball in the x orientation. 
            // We use this number to control the Platform's z axis rotation speed, 
            // so that the Platform is tilted in the x orientation correspondingly. 
            act.Add(vectorObs[5] * rotationSpeed);

            // state[7] is the velocity of the ball in the z orientation. 
            // We use this number to control the Platform's x axis rotation speed,  
            // so that the Platform is tilted in the z orientation correspondingly. 
            act.Add(-vectorObs[7] * rotationSpeed);

            return act.ToArray();
        }

        // If the vector action space type is discrete, then we don't do anything.     
        return new float[1] { 1f };
    }

    public List<float> MakeMemory(
        List<float> vectorObs,
        List<Texture2D> visualObs,
        float reward,
        bool done,
        List<float> memory)
    {
        return new List<float>();
    }
}