Create a 3D texture via script

Texture3D

// Set the texture parametersint size = 32;TextureFormat format = TextureFormat.RGBA32;bool mipChain = false;// Create a 3D texture with a width, height and depth of 32 pixelsTexture3D texture = new Texture3D(size, size, size, format, mipChain);

Example

using UnityEditor;using UnityEngine;public class ExampleEditorScript : MonoBehaviour{    [MenuItem("CreateExamples/3DTexture")]    static void CreateTexture3D()    {        // Set the texture parameters        int size = 32;        TextureFormat format = TextureFormat.RGBA32;        TextureWrapMode wrapMode =  TextureWrapMode.Clamp;        // Create the texture and apply the parameters        Texture3D texture = new Texture3D(size, size, size, format, false);        texture.wrapMode = wrapMode;        // Create a 3-dimensional array to store color data        Color[] colors = new Color[size * size * size];        // Populate the array so that the x, y, and z values of the texture map to red, blue, and green colors        float inverseResolution = 1.0f / (size - 1.0f);        for (int z = 0; z < size; z++)        {            int zOffset = z * size * size;            for (int y = 0; y < size; y++)            {                int yOffset = y * size;                for (int x = 0; x < size; x++)                {                    colors[x + yOffset + zOffset] = new Color(x * inverseResolution,                        y * inverseResolution, z * inverseResolution, 1.0f);                }            }        }        // Copy the color values to the texture        texture.SetPixels(colors);        // Apply the changes to the texture and upload the updated texture to the GPU        texture.Apply();                // Save the texture to your Unity Project        AssetDatabase.CreateAsset(texture, "Assets/Example3DTexture.asset");    }}