> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to add texture to a surface using random points

## Objective:

This example creates a bumpy texture on the surface by generating a series of random spheres.

## Applies to:

* nTop
* Surface textures
* Lists

## Procedure:

1. Extract the [CAD surfaces](/help-articles/knowledge-base/implicit-modeling/how-to-work-with-cad-bodies) where you want to add bumps, save them in a CAD Face List.

2. Use **Mesh from CAD Body** on the Face List.

3. **Remesh Surface.**

4. **Merge Meshes** to join the list into a single mesh object. This step is unnecessary if starting with a single CAD face.

5. Add a **Random Points on Mesh** block and enter the number of points you want to create. These points will locate the origin of each sphere.

![A mesh with the Random Points on Mesh block applied.](https://files.learn.ntop.com/help-articles/textures/1500000546221.png)

6. Add a **Sphere** block and input the Point List into the Center Point Input. Be sure to change the block type to Implicit Body List.

7. **Boolean Union** the Spheres to itself to get rid of the lists.

8. **Boolean Union** the Spheres with the original body to complete your part.

![An implicit body with spheres placed at each of the random point locations. The spheres have been merged with the implicit body to create a bumpy textured body.](https://files.learn.ntop.com/help-articles/textures/1500000535382.png)

And that's it! You've successfully added bumps to the surface of your part.

Are you still having issues? Contact the [support team](https://support.ntopology.com/hc/en-us/requests/new), and we'll be happy to help!

## Download the Example file:

* [Example file](https://files.learn.ntop.com/Support%20Article%20Example%20Files/Knowledge%20Base/Textures/Texture%20using%20Random%20Points%20Example.ntop)

## Keywords:

*mesh surface texture list points remesh merge point meshes random how-to bump pimple sphere textured raised*