On-Demand access, loading & caching of Unity BuiltInResource Primitive Type Meshes.

Unity-UnityPrimitives

using System;
using UnityEngine;

namespace NoiseCrimeStudios.Core.UnitySupport
{
    /// <summary>
    /// On-Demand access, loading & caching of Unity BuiltInResource Primitive Type Meshes.
    /// </summary>
    public static class UnityPrimitives
    {
        private static Mesh unityCapsuleMesh = null;
        private static Mesh unityCubeMesh = null;
        private static Mesh unityCylinderMesh = null;
        private static Mesh unityPlaneMesh = null;
        private static Mesh unitySphereMesh = null;
        private static Mesh unityQuadMesh = null;

        /// <summary>
        /// Gets the Mesh of 'Unity BuiltInResource Primitive' Type, via 'on demand' caching of Primitive type.
        /// </summary>
        public static Mesh TryGetMesh(PrimitiveType primitiveType)
        {
            try
            {
                switch ( primitiveType )
                {
                    case PrimitiveType.Sphere:
                        return unitySphereMesh ?? ( unitySphereMesh = Resources.GetBuiltinResource<Mesh>(GetPrimitiveMeshPath(primitiveType)) );
                    case PrimitiveType.Capsule:
                        return unityCapsuleMesh ?? ( unityCapsuleMesh = Resources.GetBuiltinResource<Mesh>(GetPrimitiveMeshPath(primitiveType)) );
                    case PrimitiveType.Cylinder:
                        return unityCylinderMesh ?? ( unityCylinderMesh = Resources.GetBuiltinResource<Mesh>(GetPrimitiveMeshPath(primitiveType)) );
                    case PrimitiveType.Cube:
                        return unityCubeMesh ?? ( unityCubeMesh = Resources.GetBuiltinResource<Mesh>(GetPrimitiveMeshPath(primitiveType)) );
                    case PrimitiveType.Plane:
                        return unityPlaneMesh ?? ( unityPlaneMesh = Resources.GetBuiltinResource<Mesh>(GetPrimitiveMeshPath(primitiveType)) );
                    case PrimitiveType.Quad:
                        return unityQuadMesh ?? ( unityQuadMesh = Resources.GetBuiltinResource<Mesh>(GetPrimitiveMeshPath(primitiveType)) );
                    default:
                        throw new ArgumentOutOfRangeException(nameof(primitiveType), primitiveType, null);
                }
            }
            catch ( Exception e )
            {
                Debug.LogError($"UnityGetPrimitiveMesh: Couldn't load Unity Primitive Mesh: {primitiveType}\n{e}");
            }

            return null;
        }

        private static string GetPrimitiveMeshPath(PrimitiveType primitiveType)
        {
            switch ( primitiveType )
            {
                case PrimitiveType.Sphere:
                    return "New-Sphere.fbx";
                case PrimitiveType.Capsule:
                    return "New-Capsule.fbx";
                case PrimitiveType.Cylinder:
                    return "New-Cylinder.fbx";
                case PrimitiveType.Cube:
                    return "Cube.fbx";
                case PrimitiveType.Plane:
                    return "New-Plane.fbx";
                case PrimitiveType.Quad:
                    return "Quad.fbx";
                default:
                    throw new ArgumentOutOfRangeException(nameof(primitiveType), primitiveType, null);
            }
        }

#if VALIDATE_METHODS
        // Quick validation Methods to check resources.
        public static void LogToConsole()
        {
            Debug.Log($"Primitives: {unitySphereMesh} {unityCapsuleMesh} {unityCylinderMesh} {unityCubeMesh} {unityPlaneMesh} {unityQuadMesh}");
        }

        public static void Validate()
        {
            UnityPrimitives.TryGetMesh(PrimitiveType.Capsule);
            UnityPrimitives.TryGetMesh(PrimitiveType.Cube);
            UnityPrimitives.TryGetMesh(PrimitiveType.Cylinder);
            UnityPrimitives.TryGetMesh(PrimitiveType.Plane);
            UnityPrimitives.TryGetMesh(PrimitiveType.Quad);
            UnityPrimitives.TryGetMesh(PrimitiveType.Sphere);
            UnityPrimitives.LogToConsole();
        }
#endif
    }
}