Shadow Overlay: Difference between revisions
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Shadow | [[File:shadow_overlay_example.jpg|thumb|right|Shadows calculated for a Shadow Overlay.]] | ||
The Shadow Overlay stores the result of a [[Shade calculation model (Shadow Overlay)|Shade calculation]] caused by the sun. The sun's [[Sun altitude (Shadow Overlay)|altitude]] and [[Sun azimuth (Shadow Overlay)|azimuth]] are stored as [[Model attributes (Shadow Overlay)|model attribute]] in the Shadow Overlay. | |||
The sun's altitude and azimuth can be automatically configured using the Shadow Overlay Wizard. It allows users to specify dates; one or more days, each with one or more hours of that day. These dates, in combination with the project's world location are used to obtain the altitude and azimuth of the sun. Each individual date corresponds to a separate [[timeframe]] of the Shadow Overlay. | |||
The shadow calculation takes into account both the [[Terrain elevation prequel (Shadow Overlay)|Terrain Elevation]] and the [[Building elevation prequel (Shadow Overlay)|Building Elevation]]. Additionally, the [[Foliage height (Shadow Overlay)|Foliage Height]] can be specified, or [[Foliage height calculation model (Shadow Overlay)|calculated automatically]] using a [[Foliage crown factor (Shadow Overlay)|Foliage crown factor]]. | |||
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*Shadow overlay is identical to the [[Shade_result_type_(Heat_Overlay)|Shade]] result type of an [[Heat Overlay]]. However, using this specific Overlay is approximately 10 times faster then calculating the Shade with the overhead of the complete [[DPRA Heat Module]]. | |||
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Latest revision as of 13:30, 13 February 2025
The Shadow Overlay stores the result of a Shade calculation caused by the sun. The sun's altitude and azimuth are stored as model attribute in the Shadow Overlay.
The sun's altitude and azimuth can be automatically configured using the Shadow Overlay Wizard. It allows users to specify dates; one or more days, each with one or more hours of that day. These dates, in combination with the project's world location are used to obtain the altitude and azimuth of the sun. Each individual date corresponds to a separate timeframe of the Shadow Overlay.
The shadow calculation takes into account both the Terrain Elevation and the Building Elevation. Additionally, the Foliage Height can be specified, or calculated automatically using a Foliage crown factor.
Notes
- Shadow overlay is identical to the Shade result type of an Heat Overlay. However, using this specific Overlay is approximately 10 times faster then calculating the Shade with the overhead of the complete DPRA Heat Module.