> ## 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.

# Volume Fraction Response

Create a Design Response that measures the fraction of material usage in some region. The response is computed by integrating the relative density field over the region. Values can range from 0 to 1.

### Inputs

| Name | Type | Description |
| - | - | - |
| Region | [Region](../../../../block-documentation/types/region) | Region that the design response will be computed in. If not provided, then the response will be calculated for the entire model. |

### Outputs

| Type |
| - |
| [Design Response](../../../../block-documentation/types/design-response) |


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