how to prevent frame drops?

Unity Engine
1

hi there

i´m loading my level at runtime. Each level is made out of single Tiles/Blocks. The maximum Mapsize is 320320 tiles, each on the same height, and each tile has 2 Polygons and the same 512512 texture + Normalmap.

I´ve 1 draw_call, no update method.
This is my maploading code:

using UnityEngine;
using System.Collections;
 
public class Map_Loader : MonoBehaviour {
   
    public int scrollspeed = 10;
    public int zoomspeed = 20;
    public int rotatespeed = 5;
   
    public int mapsize_x = 1;
    public int mapsize_y = 1;
	
	public Vector3 mouse3d;
	public Vector2 mouse3dtile;
   
    public GameObject TilemapHolder;
    public GameObject kamera;
    public GameObject kamera_view;
	public Camera kamera_view_cam;
	public GameObject BasicMapPrefab;
	public GameObject BasicBlockForSize;
	
    public int _____________________;
	
    public GameObject DirtBlock;
    public GameObject DirtStraight;
    public GameObject DirtInnerCurver;
    public GameObject DirtOuterCurver;
    public GameObject DirtRoof;
    public GameObject DirtGold;
    public GameObject DirtDitrima;
    public GameObject DirtFloor;
    
    public int prefabInterneBlockzahl = 1;
	
    public int ____________________;
	
	//public BlockStats[][] tilemap;
	BlockStats scriptholder;
	public GameObject[,] tilemap;
	
	
	Ray mousepoint;
	RaycastHit hit;
	Vector3 size;
	int camheight = 0;
	Transform childholder;
	bool map_loaded = false;
		
    // Use this for initialization
    void Start () {
		map_loaded = false;
    	MeshFilter mf = BasicBlockForSize.GetComponent(typeof(MeshFilter)) as MeshFilter;
        if (mf == null){return;}
        Mesh mesh = mf.sharedMesh;
        if (mesh == null){return;}
        size = mesh.bounds.size;
		camheight = (int)(size.y*5.3);
		size = new Vector3(size.x*prefabInterneBlockzahl, size.y, size.x*prefabInterneBlockzahl);
        kamera.transform.position = new Vector3(((mapsize_x/2)*size.x), 0, ((mapsize_y/2)*size.x)-(10*size.x));
		
		// Start Maploader
        StartCoroutine(createMap());
    }
    
    IEnumerator createMap() {
		//if(mapsize_x > 10 || mapsize_y > 10){
		//	Debug.LogError("Mapsize is out of Bounds. Please set a maximum size of 10*10 Prefabs.");
		//	Application.Quit();
		//}
        int maprun_x = 0;
        int maprun_y = 0;
        float pos_x = 0;
        float pos_y = 0;
		int yieldcount = 0;
		tilemap = new GameObject[321,321];
		
        for(maprun_y=0; maprun_y<mapsize_y; maprun_y++){
			//Debug.Log("Y auf: " + maprun_y);
			//Debug.Log("Block_ID: " + blockid);
            for(maprun_x=0; maprun_x<mapsize_x; maprun_x++){
                pos_x = maprun_x*size.x;
                pos_y = maprun_y*size.z;
                tilemap[maprun_x, maprun_y] = Instantiate(BasicMapPrefab, new Vector3(pos_x, 0, pos_y), Quaternion.identity) as GameObject;
                tilemap[maprun_x, maprun_y].transform.parent = TilemapHolder.transform;
                tilemap[maprun_x, maprun_y].name = "DirtBlock_Position: "+(maprun_x)+"/"+(maprun_y);
            }
			//wait after every row / update percentage of UI Loadbar
			if(yieldcount > 10){
				yield return 0;
				Debug.Log("Reihe geladen: " + (maprun_y-1));
				yieldcount = 0;
			}
			else{
				yieldcount ++;
			}
        }
		map_loaded = true;
    }
}

What happens now:

if i add this script to ma Tilemap object wich is set as “TilemapHolder”. Add mapsizes and prefab, i hit play.
Now - the FPS drops from 533 to an amount between 0.5 and 1.5…
When the complete map is loaded, the FPS are at a maximum of 130FPS…

You only see 40x30 Maptiles, the rest is out of view. I´ve no light added - and it makes no difference if i remove the normalmap or not.

So… is there a good way to prevent this FPS drop during mapload - And a way to raise the FPS during runtime after the loading is finished?

2

On loading, use a loading screen, then we expect the frame rate to drop so it shouldn’t be too obvious.

If this isn’t a top down game, simply use occlusion culling and reduce clipping planes in cameras (if you can) to reduce FPS. If you are purposely not using a light, just use a diffuse shader.

Hope this helps! :smile:

3

I´m not an owner of Unity pro… so… no occlusion culling…

There will be many lights later - every 4th tile will have a torch/lamp. And there´ll be up to 250 Unity working paralell.
(it´s a Dungeon keeper remake)

I´ll do a loading screen for the maploader… But… are 130FPS in gameplay (without lights and units) enough?

4

130FPS is exceptional for any game, even a 2D mario-style side-scroller!

I think there are some occlusion culling solutions - some paid: http://forum.unity3d.com/threads/166748-InstantOC-dynamic-occlusion-culling-LOD (though only $15); some free: http://blog.pixelpracht.net/?p=340. Or you could always write your own algorithm (as explained in the link to the free one).

Lights don’t really have much effect on frame rate unless they are all dynamic, crazy and have their own colour etc.