Assets/Scripts/BuildingGenerator.cs

using UnityEngine;

namespace UnityAgent
{
    /// <summary>
    /// Procedural building generator: builds a box building mesh with
    /// emissive windows and adds a BoxCollider for collision.
    /// </summary>
    public static class BuildingGenerator
    {
        public static GameObject Generate(string name, Vector3 position, Vector3 size,
                                          Material wallMaterial, Material windowMaterial)
        {
            GameObject go = new GameObject(name);
            go.transform.position = position;

            // Walls
            GameObject walls = GameObject.CreatePrimitive(PrimitiveType.Cube);
            walls.name = "Walls";
            walls.transform.SetParent(go.transform, false);
            walls.transform.localScale = size;
            walls.transform.localPosition = Vector3.up * size.y * 0.5f;
            if (wallMaterial != null) walls.GetComponent<MeshRenderer>().sharedMaterial = wallMaterial;

            // Windows: a smaller cube with the window material, slightly offset on each side.
            if (windowMaterial != null)
            {
                GameObject windows = GameObject.CreatePrimitive(PrimitiveType.Cube);
                windows.name = "Windows";
                windows.transform.SetParent(go.transform, false);
                windows.transform.localScale = size * 0.99f;
                windows.transform.localPosition = Vector3.up * size.y * 0.5f;
                var mr = windows.GetComponent<MeshRenderer>();
                mr.sharedMaterial = windowMaterial;
            }

            // Collider (the cube already has one, but ensure it's a BoxCollider).
            var box = go.GetComponent<BoxCollider>();
            if (box == null) box = go.AddComponent<BoxCollider>();
            box.size = size;
            box.center = Vector3.up * size.y * 0.5f;

            return go;
        }

        /// <summary>
        /// Build an emissive window material procedurally so the agent does
        /// not depend on any asset on disk.
        /// </summary>
        public static Material MakeWindowMaterial(Color glow)
        {
            var m = new Material(Shader.Find("Standard"));
            m.name = "WindowMat";
            m.color = Color.black;
            m.SetColor("_EmissionColor", glow);
            m.EnableKeyword("_EMISSION");
            return m;
        }

        public static Material MakeWallMaterial(Color col)
        {
            var m = new Material(Shader.Find("Standard"));
            m.name = "WallMat";
            m.color = col;
            return m;
        }
    }
}