moving verts, drawing triangles

Unity Engine
1

hey I’m making this thing where you can use the L-R-arrow keys to move the sides on the X axis of a cube and U-D-arrow keys to move the top and bottom of the cube on Y.
thats all fine (I think) but then redrawing my triangles gives me headaches…

the thing is i don’t want to draw them manually because i want to be able to use the script on almost any shape of model (but thats for later) for now I’m looking if there is a way to set my triangles with a simple algorithm, but one that connects the polygons. this what i have is drawing triangles per side (again i think)
if i got this correct (for a cube) every side has 8 verts, so thinking about that i don’t want to connect verts 4-5 to 0-1 but rather the 2 of the opposite side… so that if i move verts 0,1,2,3 (lets say if the obj is place in the worlds center thats the side on the positive x ) the new tris get drawn from the side on negative x to positive x… if that is understandable :wink:

using UnityEngine;
using System.Collections;

public class ManipulateSide : MonoBehaviour {
	
	public Mesh mesh;
	public float translateSpeed=2.0f;
	private Vector3[] vertices;
		
	void Start ()
	{
		if(mesh == null)
			mesh=gameObject.GetComponent<MeshFilter>().mesh;
	}
	// Update is called once per frame
	void Update () 
	{
		vertices = mesh.vertices;
		if(Input.GetAxis("Horizontal")>0)
		{
			for(int i=4 ; i< mesh.vertexCount; i++) //fix i to select right side (vert nrs)
			{
				vertices[i] =new Vector3(vertices[i].x + Input.GetAxis("Horizontal")*Time.deltaTime * translateSpeed, vertices[i].y, vertices[i].z);
				mesh.vertices = vertices;
				for(int ii = i; ii<4; ii++)
				mesh.triangles = new int[] {ii,ii+1,ii+2};
			}
		}
		if(Input.GetAxis("Horizontal")<0)
		{
			for(int i=4 ; i< mesh.vertexCount; i++) //fix i to select right side (vert nrs)
			{
				vertices[i] =new Vector3(vertices[i].x + Input.GetAxis("Horizontal")*Time.deltaTime * translateSpeed, vertices[i].y, vertices[i].z);
				mesh.vertices = vertices;
				for(int ii = i; ii<4; ii++)
				mesh.triangles = new int[] {ii,ii+1,ii+2};
			}
		}
        mesh.RecalculateBounds();
		//print(mesh.vertexCount);
	}
}
2

bumpy… maybe i didn’t explain it all to well.
i think what i’m looking for is an algorithm to draw triangles using shared vertices, is that possible or it the order for this different for every mesh?

3

ok this does it, anyway of writing it better?

using UnityEngine;
using System.Collections;

public class ManipulateSide : MonoBehaviour {
	
	public Mesh mesh;
	public float translateSpeed=2.0f;
	private Vector3[] vertices;
		
	void Start ()
	{
		if(mesh == null)
			mesh=gameObject.GetComponent<MeshFilter>().sharedMesh;
	}
	// Update is called once per frame
	void Update () 
	{
		vertices = mesh.vertices;
		if(Input.GetAxis("Horizontal")>0)
		{
			for(int i=0 ; i< 8; i+=2)
			{
				vertices[i] =new Vector3(vertices[i].x + Input.GetAxis("Horizontal")*Time.deltaTime * translateSpeed, vertices[i].y, vertices[i].z);
				mesh.vertices = vertices;
			}
		}
		if(Input.GetAxis("Horizontal")<0)
		{
			for(int i=1 ; i< 8; i+=2)
			{
				vertices[i] =new Vector3(vertices[i].x + Input.GetAxis("Horizontal")*Time.deltaTime * translateSpeed, vertices[i].y, vertices[i].z);
				mesh.vertices = vertices;				
			}
		}
		if(Input.GetAxis("Vertical")>0)
		{
			for(int i=3 ; i< 8; i+=4)
			{
				vertices[i] = new Vector3(vertices[i].x, vertices[i].y + Input.GetAxis("Vertical")*Time.deltaTime * translateSpeed, vertices[i].z);
				mesh.vertices = vertices;
			}
			for(int i=2 ; i< 8; i+=4)
			{
				vertices[i] = new Vector3(vertices[i].x, vertices[i].y + Input.GetAxis("Vertical")*Time.deltaTime * translateSpeed, vertices[i].z);
				mesh.vertices = vertices;
			}
		}
		if(Input.GetAxis("Vertical")<0)
		{
			for(int i=0 ; i< 2; i++)
			{
				vertices[i] =new Vector3(vertices[i].x, vertices[i].y + Input.GetAxis("Vertical")*Time.deltaTime * translateSpeed, vertices[i].z);
				mesh.vertices = vertices;				
			}
			for(int i=4 ; i< 6; i++)
			{
				vertices[i] =new Vector3(vertices[i].x, vertices[i].y + Input.GetAxis("Vertical")*Time.deltaTime * translateSpeed, vertices[i].z);
				mesh.vertices = vertices;				
			}
		}
		mesh.triangles = new int[] {0,1,3,
									2,0,3,
									0,2,6,
									0,6,4,
									5,4,6,
									5,6,7,
									1,5,7,
									7,3,1,
									5,1,0,
									0,4,5,
									7,6,3,
									6,2,3};
        mesh.RecalculateBounds();
	}
}