CesiumPrimitiveFeatures.cs

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using System;
using System.Collections.Generic;
using UnityEngine;
 
namespace CesiumForUnity
{
    [IconAttribute("Packages/com.cesium.unity/Editor/Resources/Cesium-24x24.png")]
    [AddComponentMenu("")]
    public partial class CesiumPrimitiveFeatures : MonoBehaviour
    {
        public CesiumFeatureIdSet[] featureIdSets
        {
            get; internal set;
        }
 
        #region Helper functions
 
        // Cache a list of indices to prevent the allocation of a new array every time
        // GetFirstVertexFromTriangle is called.
        private static List<int> _indices;
 
        private static int GetFirstVertexFromTriangle(MeshFilter meshFilter, int triangleIndex)
        {
            if (meshFilter == null || meshFilter.mesh == null)
            {
                return -1;
            }
 
            if (CesiumPrimitiveFeatures._indices == null)
            {
                CesiumPrimitiveFeatures._indices = new List<int>();
            }
 
            meshFilter.mesh.GetTriangles(CesiumPrimitiveFeatures._indices, 0);
            int targetVertex = triangleIndex * 3;
            return targetVertex < CesiumPrimitiveFeatures._indices.Count ? CesiumPrimitiveFeatures._indices[targetVertex] : -1;
        }
        #endregion
 
        #region Public methods
        public static int GetFirstVertexFromHitTriangle(RaycastHit hitInfo)
        {
            MeshFilter meshFilter = hitInfo.transform.GetComponent<MeshFilter>();
            return GetFirstVertexFromTriangle(meshFilter, hitInfo.triangleIndex);
        }
 
        public CesiumFeatureIdSet[] GetFeatureIdSetsOfType(CesiumFeatureIdSetType type)
        {
            return Array.FindAll(this.featureIdSets, set => (set.type == type));
        }
 
 
        public Int64 GetFeatureIdFromTriangle(int triangleIndex, Int64 featureIdSetIndex = 0)
        {
            MeshFilter meshFilter = this.gameObject.GetComponent<MeshFilter>();
            if (meshFilter == null || featureIdSetIndex < 0 || featureIdSetIndex >= this.featureIdSets.Length)
            {
                return -1;
            }
 
            CesiumFeatureIdSet featureIdSet = this.featureIdSets[featureIdSetIndex];
 
            return featureIdSet.GetFeatureIdForVertex(
                GetFirstVertexFromTriangle(meshFilter, triangleIndex));
        }
 
        public Int64 GetFeatureIdFromRaycastHit(RaycastHit hitInfo, Int64 featureIdSetIndex = 0)
        {
            if (hitInfo.transform.GetComponent<CesiumPrimitiveFeatures>() != this ||
                featureIdSetIndex < 0 || featureIdSetIndex >= this.featureIdSets.Length)
            {
                return -1;
            }
 
            CesiumFeatureIdSet featureIdSet = this.featureIdSets[featureIdSetIndex];
 
            return featureIdSet.GetFeatureIdFromRaycastHit(hitInfo);
        }
 
        #endregion 
    }
}