How can I create vector fields for use with the new VFX Graph?

What i've found so far is you can make a texture3d through code and save it as a .asset file. Here is the example code: https://docs.unity3d.com/Manual/class-Texture3D.html. and to save it you can use AssetDatabase.CreateAsset() found from this thread. Here is another interesting tool to help visualize the 3d texture. https://github.com/raphael-ernaelsten/Texture3DPreview-for-Unity

Here is my full code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Gen3 : MonoBehaviour
 {
     Texture3D texture;
 
     void Start()
     {
         texture = CreateTexture3D(256);
         UnityEditor.AssetDatabase.CreateAsset(texture, "Assets/test/t3d.asset");
         Debug.Log(UnityEditor.AssetDatabase.GetAssetPath(texture));
     }
 
     Texture3D CreateTexture3D(int size) {
         Color[] colorArray = new Color[size * size * size];
         texture = new Texture3D(size, size, size, TextureFormat.RGB24, true);
         float r = 1 / (size - 1);
         for (int i = 0; i < size; i++) {
             for (int j = 0; j < size; j++)
             {
                 for (int k = 0; k < size; k++)
                 {
                     colorArray[i + (j * size) + (k * size * size)] = new Color(i * r, j * r, k * r, 1);
                 }
             }
         }
         texture.SetPixels(colorArray);
         texture.Apply();
         return texture;
     }
 }

I made a Vector Field Maker plugin for Unity which has a Free version, check it out here

You can add arrows and drag them and duplicate them to create the effect needed here is a tutorial

https://youtu.be/VLXYCXRUE5k

TOTALLY FREE AND AWESOME WAY TO MAKE YOUR OWN SDF/VF/POINT CACHES this is a link to my tutorial on how to make your own .vf files for use with unitys vfx graph - conform t signed distance field etc

this use vfx toolbox for unity from github and free version of Houdini .. all links in video description