Multidirectional hillshade

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## Motivation

Multidirectional hillshade improves terrain visualization. It combines light from different directions to represent an enhanced visualization of the terrain and to improve the appearance of regions with low relief. It improves the balance between the overexposed and shadow areas of the map. The output is suitable to use as a relief backdrop for topographical, soil, hydrological, land cover, or other thematic maps in which the data will be enhanced with topography.

## Design Alternatives

Multiple layers with Single hillshading on different parameters

### Mock-Up

see : [https://iderioja.github.io/doc_lidar_2016_processing_en/dtm_dsm/hillshade/](https://iderioja.github.io/doc_lidar_2016_processing_en/dtm_dsm/hillshade/)

### Concepts

See [https://pro.arcgis.com/en/pro-app/latest/help/analysis/raster-functions/hillshade-function.htm](https://pro.arcgis.com/en/pro-app/latest/help/analysis/raster-functions/hillshade-function.htm)

### Implementation

```
After multiple tests, the following three lighting sources have been selected:

Azimuth | Height | Transparency
-- | -- | --
350º | 70º | 65%
15º | 60º | 50%
270º | 270º | 70%

```

source : [https://iderioja.github.io/doc_lidar_2016_processing_en/dtm_dsm/hillshade/](https://iderioja.github.io/doc_lidar_2016_processing_en/dtm_dsm/hillshade/)

Increase the number of input fields in the hillshading style layer for taking into account multiple Azimuth, Height and Transparency .

Start by locating the hillshading style layer and reviewing the linked multidirectional hillshade references and mock-up. The change is complete when the layer supports multiple Azimuth, Height, and Transparency inputs using the three listed lighting sources and produces the intended multidirectional terrain visualization.

Written by the indexing model from the issue text.