> ## 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.

# Optional: Texturing Test Problem

Now that you have learned field-based texturing in nTop, feel free to try this optional test problem with a review of the answer in the following lesson.

Given this part in the starter file below, add roughness to the part. Use a Frequency of 100 and a Max Amplitude of 0.6.

* **Constant Roughness:** Create a constant roughness throughout the part.
* **Varied Roughness:** Vary the roughness so that the face highlighted in the image is smooth and eventually reaches the max amplitude at the end of the part.
* **Mimicking AM Surfaces:** Mimic the surfaces on a part using the **Angle Field**block to vary the roughness. Assume the build plane has a normal of \<0,0,1>.

<Frame>
  <img src="https://files.learn.ntop.com/lessons/optional-texturing-test-problem/texturing_problem.png" />
</Frame>

\*\*Estimated Time to Complete:\*\*25 minutes

[311\_13\_smoothpart.x\_t](https://files.learn.ntop.com/Courses/311%20Ribbing%20and%20Texturing/Models/311_13_smoothpart.x_t)