Unity game - generate circuit with line drawing

Question

I'm not a very beginer in unity, but not so far ;). Today, I want to make a game which is a mix pool pinball. The game physic is quite ok for me, but my big challenge is : what i want to do

Allow the player to draw his own circuit and then place the different item : bumper, sticky wall ...

I make it in 3D, but with the camera position, it will be like 2D. First of all, I don't know how to make curvy gameobject. I know about bezier curve generator, but not how generate shape with.

Ideally, it would be great if I could : draw a line (with the mouse or finder position) like a line renderer component and then unity extrude in one direction the field circuit. And that' it I have my circuit. The second challenge will be to place (whit mouse or finger) the different component : bumper, players... with some rules : A sticky wall have to be on a simple wall from the circuit, not in the middle, you have to alway keep some space for the balls etc... Then we create a game circuit, then we could play :):)

I work with the last unity version.

Obviously, I don't expect a full solution:rolleyes:, but according to you, is it possible ? And which way, which technic I should learn to do that? Which could be the big issu ? ... any remark advice is good to take.

I already begin to look at https://unity3d.com/fr/learn/tutori...ation-tutorial/creating-meshes?playlist=17153, I d'ont know if it's completly too much or not ?

Many thanks for your help, Axel

Answer 1

Here my solution

using System.IO;
using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.Networking;
public class scri : MonoBehaviour
{
// For saving the mesh------------------------ 
public KeyCode saveKey = KeyCode.F12;
public string saveName = "SavedMesh";

// Concerning mesher--------------------------
public GameObject mesher; //require

public List<Vector3> vertices;
public  List<int> triangles;

public Vector3 point0;
public Vector3 point1;
public Vector3 point2;
public Vector3 point3;

public int loop;
public float size;

public Mesh meshFilterMesh;
public Mesh meshColliderMesh;

// Sprite work
public Color[] pixels;

public Texture2D newTexture;  
public Texture2D oldTexture;  //require

private Sprite mySprite;
private SpriteRenderer spriteRenderer;

public int pathCount;

public GameObject displayerComponent; //require

public PolygonCollider2D polygonColliderAdded; //require

void Start()
{
    // Mesher
    vertices = new List<Vector3> (); 
    triangles = new List<int> (); 
    meshFilterMesh= mesher.GetComponent<MeshFilter>().mesh;
    meshColliderMesh= mesher.GetComponent<MeshCollider>().sharedMesh;
    size = 10; // lenght of the mesh in Z direction
    loop=0;

    // Sprite
    pixels = oldTexture.GetPixels();
    newTexture =new Texture2D(oldTexture.width,oldTexture.height,TextureFormat.ARGB32, false);
    spriteRenderer = gameObject.AddComponent<SpriteRenderer>();

    ConvertSpriteAndCreateCollider (pixels);
    BrowseColliderToCreateMesh (polygonColliderAdded);

}

void Update()
{
    // Save if F12 press
    if (Input.GetKeyDown(saveKey)){SaveAsset();}
}

public void ConvertSpriteAndCreateCollider (Color[] pixels) {
    for (int i = 0 ; i < pixels.Length ; i++ ) 
    { 
        // delete all black pixel (black is the circuit, white is the walls)
        if ((pixels[i].r==0 && pixels[i].g==0 && pixels[i].b==0 && pixels[i].a==1)) {
            pixels[i] = Color.clear;
        }
    }
    // Set a new texture with this pixel list
    newTexture.SetPixels(pixels);
    newTexture.Apply();

    // Create a sprite from this texture
    mySprite = Sprite.Create(newTexture, new Rect(0, 0, newTexture.width, newTexture.height), new Vector2(10.0f,10.0f), 10.0f, 0, SpriteMeshType.Tight,new Vector4(0,0,0,0),false);

    // Add it to our displayerComponent
    displayerComponent.GetComponent<SpriteRenderer>().sprite=mySprite;

    // Add the polygon collider to our displayer Component and get his path count
    polygonColliderAdded = displayerComponent.AddComponent<PolygonCollider2D>();

}

// Method to browse the collider and launch makemesh
public void BrowseColliderToCreateMesh (PolygonCollider2D polygonColliderAdded){
    //browse all path from collider
    pathCount=polygonColliderAdded.pathCount;
    for (int i = 0; i < pathCount; i++)
    {
        Vector2[] path = polygonColliderAdded.GetPath(i);

        // browse all path point
        for (int j = 1; j < path.Length; j++)
        {
            if (j != (path.Length - 1)) // if we aren't at the last point
            {
            point0 = new Vector3(path[j-1].x ,path[j-1].y ,0);
            point1 = new Vector3(path[j-1].x ,path[j-1].y ,size);
            point2 = new Vector3(path[j].x ,path[j].y ,size);
            point3 = new Vector3(path[j].x ,path[j].y ,0);
                MakeMesh(point0,point1,point2,point3);

            } 
            else if(j == (path.Length - 1))// if we are at the last point, we need to close the loop with the first point
            {
            point0 = new Vector3(path[j-1].x ,path[j-1].y ,0);
            point1 = new Vector3(path[j-1].x ,path[j-1].y ,size);
            point2 = new Vector3(path[j].x ,path[j].y ,size);
            point3 = new Vector3(path[j].x ,path[j].y ,0);
                MakeMesh(point0,point1,point2,point3);
            point0 = new Vector3(path[j].x ,path[j].y ,0);
            point1 = new Vector3(path[j].x ,path[j].y ,size);
            point2 = new Vector3(path[0].x ,path[0].y ,size); // First point
            point3 = new Vector3(path[0].x ,path[0].y ,0); // First point
                MakeMesh(point0,point1,point2,point3);
            }
        }
    }
}


//Method to generate 2 triangles mesh from the 4 points 0 1 2 3 and add it to the collider
public void MakeMesh (Vector3 point0,Vector3 point1,Vector3 point2, Vector3 point3){

    // Vertice add
    vertices.Add(point0);
    vertices.Add(point1);
    vertices.Add(point2);
    vertices.Add(point3);

    //Triangle order
    triangles.Add(0+loop*4);
    triangles.Add(2+loop*4);
    triangles.Add(1+loop*4);
    triangles.Add(0+loop*4);
    triangles.Add(3+loop*4);
    triangles.Add(2+loop*4);
    loop = loop + 1; 

    // create mesh 
    meshFilterMesh.vertices=vertices.ToArray();
    meshFilterMesh.triangles=triangles.ToArray();

    // add this mesh to the MeshCollider
    mesher.GetComponent<MeshCollider>().sharedMesh=meshFilterMesh;
}

// Save if F12 press
public void SaveAsset() 
{
    var mf = mesher.GetComponent<MeshFilter>();
    if (mf)
    {
        var savePath = "Assets/" + saveName + ".asset";
        Debug.Log("Saved Mesh to:" + savePath);
        AssetDatabase.CreateAsset(mf.mesh, savePath);
    }
}

}