> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/hb-radiance-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/hb-radiance-primer/components/1_modifiers/opaque_modifier.md).

# Opaque Modifier

![](/files/-Mihqg-N3ldM3Ba8wJ0V)

![](/files/-MihqbMvNqyQqlWohRRg) - [\[source code\]](https://github.com/ladybug-tools/honeybee-grasshopper-radiance/blob/master/honeybee_grasshopper_radiance/src//HB%20Opaque%20Modifier.py)

Create an opaque radiance modifier from a single reflectance.

### Inputs

* **name**

Text to set the name for the modifier and to be incorporated into a unique modifier identifier.

* **reflect \[Required]**

A number between 0 and 1 for the absolute diffuse reflectance of the modifier. This reflectance will be the same for the red, green and blue channels.

* **spec**

A number between 0 and 1 for the absolute specular reflectance of the modifier. Note that the sum of this value and the diffuse \_reflect should be less than one. Specular reflectances greater than 0.1 are rare for non-metallic materials. (Default: 0).

* **rough**

Roughness is specified as the rms slope of surface facets. A value of 0 corresponds to a perfectly smooth surface, and a value of 1 would be a very rough surface. Roughness values greater than 0.2 are not very realistic. (Default: 0).

### Outputs

* **modifier**

An opaque modifier that can be assigned to a Honeybee geometry or Modifier Sets.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ladybug.tools/hb-radiance-primer/components/1_modifiers/opaque_modifier.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.