Perlin Noise Mesh

Unity Engine
1

Hello all. I have started working on terrain generation in unity. So far, I have a small script based off of this post by WillJ: http://forum.unity3d.com/threads/151608-Random-Terrain-Generator. This works well, and creates a block-based terrain, like something from Minecraft. However, I want to make a mesh instead of using blocks. I looked at this page of the documentation, but I’m not sure how to use it for what I need: http://docs.unity3d.com/Documentation/ScriptReference/Mesh.html.

This is the block-based script I have:

private var rotation: Quaternion;
rotation.eulerAngles=Vector3(0,0,0);

private var startpos=Vector3(20,20,20);

var obj:GameObject;
var player:GameObject;

function Start(){
	
	for(var xx:float=0; xx<75; xx++){
		for(var yy:float=0; yy<75; yy++){
			var perlin1=Mathf.PerlinNoise(xx/15,100);
			var perlin2=Mathf.PerlinNoise(yy/15,100);
			
			Instantiate(obj,Vector3(yy,Mathf.Round(perlin1*25*perlin2),xx),rotation);
		}
	}
	
	Instantiate(player,startpos,rotation);
	
}

I guess what I’m asking, is how to use the perlin noise in the code above along with the mesh functions to make a random terrain. Now, I’m not asking anyone to write a script for me, but if someone could at least point me in the right direction with using the mesh functions along with perlin noise, I’d really appreciate it.

Thanks

2

Learn the Mesh class; you can download the procedural mesh examples to start with.

–Eric

3

Instead of Instantiating obj at that Vector3 just put the Vector3 in an array and feed the final array to a Mesh instance. You’ll also need to give it a triangles array at the very least - of which there are examples of triangulation and procedural mesh generation floating around.

Also note that you could write Quaternion.identity instead of eulerAngles = new Vector3(,0,0,0) to represent “no rotation” :slight_smile:

4

Thanks for both the replies. I like the sound of your idea KelsoMRK. I’ll definitely try that out when I get a chance. Thanks for the tip about Quaternion.identity too :slight_smile:

5

Well, I tried… and failed. Below is a link to a picture of the code, and an error I got:

http://gyazo.com/38fe5bec98d747be47fcd00c79ccb55c

I tried what you said, and put each vector into an array, and put those arrays into a Vector3 for the mesh.vertices. But I now found out you can’t put arrays into a Vector3?.. Also I have no clue how to do the triangles now that my attempt at putting arrays into a vector3 didn’t work out. Below I posted the actual code as well, as humiliating as it is :smile:

private var startpos=Vector3(20,20,20);

var obj:GameObject;
var player:GameObject;

function Start(){
	
	for(var xx:float=0; xx<75; xx++){
		for(var yy:float=0; yy<75; yy++){
			var perlin1=Mathf#PerlinNoise(xx/15,100);
			var perlin2=Mathf#PerlinNoise(yy/15,100);
			
			
			//Instantiate(obj,Vector3(yy,Mathf.Round(perlin1*25*perlin2),xx)Quaternion.identity);
			
			var mesh:Mesh=GetComponent(MeshFilter).mesh;
			
			var vertsx:int[]=new int[yy];
			var vertsy:int[]=new int[Mathf.Round(perlin1*25*perlin2)];
			var vertsz:int[]=new int[xx];
			
			mesh.vertices=Vector3(vertsx,vertsy,vertsz);
			
			//trianglulation...?
			
		}
	}
	
	Instantiate(player,startpos,Quaternion.identity);
	
}

Any help on fixing this would be great. Thanks

6

mesh.vertices is an array of Vector3’s not a Vector3 of arrays (that’s not even a thing:))

7

Be honest… am i the dumbest person alive?! :slight_smile: I’ll check it out. Thanks!

edit

Well I though of an error the last thing I wrote had, and now have this:

private var startpos=Vector3(20,20,20);

private var width=75;
private var height=75;

var obj:GameObject;
var player:GameObject;

function Start(){
	
	for(var xx:float=0; xx<width; xx++){
		for(var yy:float=0; yy<height; yy++){
			var perlin1=Mathf.PerlinNoise(xx/15,100);
			var perlin2=Mathf.PerlinNoise(yy/15,100);
			
			
			//Instantiate(obj,Vector3(yy,Mathf.Round(perlin1*25*perlin2),xx),Quaternion.identity);
			
			var mesh:Mesh=GetComponent(MeshFilter).mesh;
			
			var vertices:Vector3[]=new Vector3[width*height];
			
			for(var i=0; i<width; i++){
				vertices[i]=new Vector3(yy,Mathf.Round(perlin1*25*perlin2),0);
				for(var j=0; j<height; j++){
					vertices[i]=new Vector3(0,Mathf.Round(perlin1*25*perlin2),xx);
				}
			}
			
			mesh.vertices=vertices;
			
			//trianglulation...?
			
		}
	}
	
	//Instantiate(player,startpos,Quaternion.identity);
	
}

Whenever you get a chance, have a look and tell me what you think, or if I made another horrible error.
Thanks