> For the complete documentation index, see [llms.txt](https://docs.d5render.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.d5render.com/user-guide/material/custom-alpha.md).

# What materials are the Custom Alpha templates suitable for? What are the special parameters?

The only special parameter of this template is the "Opacity Map" parameter. But there is a slight difference with the "Opacity Map" in the Cloth material template. There is no semi-transparent effect here, the material is either **completely preserved or completely hollow**. 

Therefore, here it is recommended to use only black and white map to control the hollow effect. 

* White is the material that is preserved, and black corresponds to the hollow position.

![](/files/-Mker6UJPFSjcsgLKwHY)

{% hint style="info" %}
In the range of 0\~255, Opacity Map gray value greater than 157, the corresponding material will be retained, and gray value less than 156, the corresponding material will be hollowed out.
{% endhint %}