Unity | mesh.colors won't color my custom mesh object

Question

I have build a custom pyramid in Unity like this:

    Mesh mesh = GetComponent<MeshFilter>().mesh;
    mesh.Clear();
    Vector3[] vertices = {
        new Vector3(0.0f, 0.5f, 0.0f),
        new Vector3(0.5f, 0.0f, 0.5f),
        new Vector3(-0.5f, 0.0f, 0.5f),
        new Vector3(-0.5f, 0.0f, -0.5f),
        new Vector3(0.5f, 0.0f, -0.5f),
    };

    int[] triangles = {
        1, 2, 3,
        1, 3, 4,
        1, 0, 2,
        2, 0, 3,
        3, 0, 4,
        4, 0, 1
    };


    mesh.vertices = vertices;
    mesh.triangles = triangles;

I am trying to color my pyramid, as said in unity documentation like this:

    Color[] colors = new Color[vertices.Length];

    for (int i = 0; i < vertices.Length; i++)
        colors[i] = Color.Lerp(Color.red, Color.green, vertices[i].y);

    // assign the array of colors to the Mesh.
    mesh.colors = colors;

but this wont change a thing..

i have no materials on my object, only this script. Any ideas?

Answer 1

In addition to https://stackoverflow.com/a/55714190/617889:

When using Universal Render Pipeline you need to use other shaders:

• Univeral Render Pipeline \ Particles \ Lit (with lightning)
• Univeral Render Pipeline \ Particles \ Unlit (without lightning)

Answer 2

Note that comment in mesh.colors

// (Note that most built-in Shaders don't display vertex colors. Use one that does, such as a Particle Shader, to see vertex colors)

so in order to see those colors in the MeshRenderer component add a material that uses such a Vertex or Particle Shader.

Therefore

1. in the Project view (Assets) do right click → Create → Material

   

2. Give that material a name

3. For the Shader from the Dropdown menu find and select e.g. Particles → Standard Unlit (or if you want to receive lightning Standard Surface)

   

4. Finally use this material for your object either by dragging it into the MeshRenderer → material or by simply dragging it onto the according object in the Scene view (the latter might not work if there is no mesh for that object yet)

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Result: