Unity won't show my programatically created Mesh(A Simple Triangle)

Questions & Answers
1

Hi, my question is simple. I'm trying to create a triangle. But it does not appear to the camera. What's missing? What am I doing wrong? I tried to create a .obj with the same vertices and it worked, why my mesh does not appear?

Here's the code:

GameObject.FindWithTag("Player").AddComponent();

                Vector3[] verts  = new Vector3[4];
        Vector3[] normals  = new Vector3[4];
        Vector2[] uv  = new Vector2[4];
        int[] tri  = new int[6];

        //MeshFilter mf  = GetComponent(MeshFilter);

        verts[2] = new Vector3(0, 0, 0);
        verts[1] = new Vector3(100, 0, 0);
        verts[0] = new Vector3(0, 0, 100);
        verts[3] = new Vector3(100, 0, 100);

        for (int i = 0; i < normals.Length; i++) {
            normals *= Vector3.up;*
 *}*
 *uv[0] = new Vector2(0, 0);*
 *uv[1] = new Vector2(1, 0);*
 *uv[2] = new Vector2(0, 1);*
 *uv[3] = new Vector2(1, 1);*
 *tri[0] = 0;*
 *tri[1] = 2;*
 *tri[2] = 3;*
 *tri[3] = 0;*
 *tri[4] = 3;*
 *tri[5] = 1;*
 *Mesh mesh = new Mesh();*
 *mesh.vertices = verts;*
 *mesh.triangles = tri;*
 *mesh.uv = uv;*
 *mesh.normals = normals;*
 *Color[] color = new Color[4];*
 *color[2] = new Color(1, 0, 0);*
 *color[1] = new Color(0, 1, 0);*
 *color[0] = new Color(0, 0, 1);*
 *color[3] = new Color(0, 1, 0);*
 *mesh.colors = color;*
 *GameObject.FindWithTag("Player").GetComponent<MeshFilter>().mesh = mesh;*
*```*
2

Oh, I found out, I missed adding the meshrenderer...

3

To clarify:

If this code is added to a script’s ‘Start’ method, which is then attached to a blank gameObject, you’ll have to add both a MeshFilter and MeshRenderer component to the gameObject in order for the code to display anything. A pure, blank, empty game-object won’t display any results at all.