75 lines
2.9 KiB
C#
75 lines
2.9 KiB
C#
namespace Environment.Instancing
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{
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using System.Collections.Generic;
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using System.Linq;
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using UnityEngine;
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/// <summary>
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/// This script calls each InstanceBehaviour in their child objects using their input variables and combines them into a single call.
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/// If you a large amount of instances behaviours, they will all create a material instance and instancing call. This causes a performance hit.
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/// As a drawback the parent node that the objects rotate and move with is not the gameobject but the parent instead and bounds can not be used to cull individual meshes.
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/// </summary>
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public class ParentInstancesBehaviour : InstancesBehaviour
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{
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/// <summary>
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/// Calculates the bounds for the instances used for culling by Unity.
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/// </summary>
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public override Bounds CalculateInstancesBounds()
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{
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return new Bounds(this.transform.position, Vector3.one * 100000); //this.GetComponent<MeshFilter>().mesh.bounds.max);
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}
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/// <summary>
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/// Implementation of instance data logic for parent instances behaviour.
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/// </summary>
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public override Dictionary<InstancingSettings, List<InstanceData>> GetInstanceData()
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{
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var parentInstanceData = new Dictionary<InstancingSettings, List<InstanceData>>();
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var childrenAndThis = this.transform.GetComponentsInChildren<InstancesBehaviour>(true);
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if (childrenAndThis.Length <= 1)
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{
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Debug.LogWarning("The ParentInstancesBehaviour could not find any InstancesBehaviours in child objects.");
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}
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foreach (var child in childrenAndThis)
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{
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if (child == this)
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{
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continue;
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}
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var instanceData = child.GetInstanceData();
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if (instanceData == null)
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{
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Debug.LogError("GetInstanceData should not return null.");
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}
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foreach (var (configuration, data) in instanceData)
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{
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for (var i = 0; i < data.Count; i++)
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{
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var instance = data[i];
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instance.TRS = this.transform.worldToLocalMatrix * child.transform.localToWorldMatrix * instance.TRS;
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data[i] = instance;
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}
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var found = parentInstanceData.Keys.FirstOrDefault(key => key.Material == configuration.Material && key.Mesh == configuration.Mesh);
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if (found == null)
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{
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parentInstanceData[configuration] = data;
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}
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else
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{
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parentInstanceData[found].AddRange(data);
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}
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}
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child.enabled = false;
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}
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return parentInstanceData;
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}
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}
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}
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