Terrain.treeMaximumFullLODCount

설명

Maximum number of trees rendered at full LOD.

This is an easy setting to prevent too many trees being rendered at too high resolution in dense forests. Since there will be no fade if treeMaximumFullLODCount is exceeded you should tweak the treeBillboardDistance to not include unnecessary trees that are not being seen but, still rendered.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Start() {
        Terrain.activeTerrain.treeMaximumFullLODCount = 200;
    }
}