Version: 2018.3 (switch to 2019.1b or 2017.4)
Movie Textures
Texture arrays
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3D Textures

Switch to Scripting

3D Textures can only be created from script. The following snippet creates 3D texture where each axis X, Y and Z corresponds to the colour values red, green and blue.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Example : MonoBehaviour
{

    Texture3D texture;

    void Start ()
    {
        texture = CreateTexture3D (256);
    }

    Texture3D CreateTexture3D (int size)
    {
        Color[] colorArray = new Color[size * size * size];
        texture = new Texture3D (size, size, size, TextureFormat.RGBA32, true);
        float r = 1.0f / (size - 1.0f);
        for (int x = 0; x < size; x++) {
            for (int y = 0; y < size; y++) {
                for (int z = 0; z < size; z++) {
                    Color c = new Color (x * r, y * r, z * r, 1.0f);
                    colorArray[x + (y * size) + (z * size * size)] = c;
                }
            }
        }
        texture.SetPixels (colorArray);
        texture.Apply ();
        return texture;
    }
        
}


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Movie Textures
Texture arrays