RenderableShadowCylinder

Inherits Renderable

This Renderable displays the shadow cylinder behind a planetary body. Given the SPICE name of a planetary body and an observer, it will show a cylinder extending behind the body away from the observer to highlight the areas of space from which the observer is occluded by the body. A concrete example is using the Sun as the observer, in which case the shadow cylinder indicates the areas in which there is darkness.

Members

Name	Documentation	Type	Description	Optional
Aberration	The aberration method that is used for computing the shadow cylinder. The options are “NONE”, “LT” (Light Time), “LT + S” (Light Time Stellar), “CN” (Converged Newtonian), and “CN + S” (Converged Newtonian Stellar).	String	In list { NONE, LT, LT+S, CN, CN+S }	No
Body	The SPICE name of target body that is used as the shadow caster.	String	Value of type ‘String’	No
BodyFrame	The SPICE name of the reference frame in which the shadow cylinder is expressed.	String	Value of type ‘String’	No
LightSource	The SPICE name of the object that is used as the illuminator for computing the shadow cylinder.	String	Value of type ‘String’	No
Observer	The SPICE name of the object that is the observer.	String	Value of type ‘String’	No
TerminatorType	Determines the type of terminator to use for calculating the shadow eclipse.	String	In list { UMBRAL, PENUMBRAL }	No
NumberOfPoints	The number of control points used for constructing the shadow geometry. The higher this number, the more detailed the shadow is, but it will have a negative impact on the performance.	Integer	Value of type ‘Integer’	Yes
ShadowColor	The color used for the shadow cylinder.	Color3	Value of type ‘Color3’	Yes
ShadowLength	A factor that controls the length of the shadow that is cast by the target object. The total length of the shadow is equal to the distance from the target to the light source multiplied with this value.	Double	Value of type ‘Double’	Yes

Inherited members from Renderable

Name	Documentation	Type	Description	Optional
DimInAtmosphere	Decides if the object should be dimmed (i.e. faded out) when the camera is in the sunny part of an atmosphere.	Boolean	Value of type ‘Boolean’	Yes
Enabled	Determines whether this object will be visible or not.	Boolean	Value of type ‘Boolean’	Yes
Opacity	This value determines the opacity of this renderable. A value of 0 means completely transparent.	Double	In range: ( 0,1 )	Yes
RenderBinMode	A value that specifies if the renderable should be rendered in the Background, Opaque, Pre-/PostDeferredTransparency, Overlay, or Sticker rendering step.	String	In list { Background, Opaque, PreDeferredTransparent, Overlay, PostDeferredTransparent, Sticker }	Yes
Tag	A single tag or a list of tags that this renderable will respond to when setting properties.	Table, or String	Value of type ‘Table’, or Value of type ‘String’	Yes
Type	The type of the renderable.	String	Value of type ‘String’	Yes

Asset Examples

local transforms = asset.require("./transforms")
local sunTransforms = asset.require("scene/solarsystem/sun/transforms")
local kernels = asset.require("./kernels")
local coreKernels = asset.require("spice/core")



local textures = asset.resource({
  Name = "Charon Textures",
  Type = "HttpSynchronization",
  Identifier = "charon_textures",
  Version = 3
})


local CharonRadius = 603500

local CharonProjection = {
  Identifier = "CharonProjection",
  Parent = transforms.PlutoBarycenterAccurate.Identifier,
  Transform = {
    Translation = {
      Type = "SpiceTranslation",
      Target = kernels.ID.Charon,
      Observer = kernels.ID.PlutoBarycenter
    },
    Rotation = {
      Type = "SpiceRotation",
      SourceFrame = kernels.Frame.Charon,
      DestinationFrame = coreKernels.Frame.Galactic
    }
  },
  Renderable = {
    Type = "RenderablePlanetProjection",
    Radius = CharonRadius,
    Segments = 350,
    ColorTexturePaths = {
      textures .. "NH_Charon_mosaic.png",
      textures .. "NH_Charon_mosaic_8192.png"
    },
    HeightTexturePaths = {
      textures .. "NH_Charon_DTM.png",
      textures .. "NH_Charon_DTM_8192.png"
    },
    MeridianShift = true,
    Projection = {
      Observer = kernels.ID.NewHorizons,
      Target = kernels.ID.Charon,
      Aberration = "NONE",
      AspectRatio = 2,
      Instrument = {
        Name = kernels.Frame.Lorri,
        Method = "ELLIPSOID",
        Aberration = "NONE",
        Fovy = 0.2907,
        Aspect = 1,
        Near = 0.2,
        Far = 10000
      },
      PotentialTargets = {
        kernels.ID.Pluto,
        kernels.ID.Charon
      }
    }
  },
  GUI = {
    Path = "/Solar System/Dwarf Planets/Pluto",
    Name = "Charon Projection"
  }
}

local CharonText = {
  Identifier = "CharonText",
  Parent = CharonProjection.Identifier,
  Transform = {
    Translation = {
      Type = "StaticTranslation",
      Position = { 0, -1000000.0, 0 }
    }
  },
  Renderable = {
    Type = "RenderablePlaneImageLocal",
    Size = 19952623.15,
    Origin = "Center",
    Billboard = true,
    Texture = textures .. "Charon-Text.png",
    BlendMode = "Additive"
  },
  GUI = {
    Name = "Charon Text",
    Path = "/Solar System/Dwarf Planets/Pluto",
    Focusable = false
  }
}

local CharonShadow = {
  Identifier = "CharonShadow",
  Parent = CharonProjection.Identifier,
  Renderable = {
    Type = "RenderableShadowCylinder",
    Opacity = 0.25,
    TerminatorType = "PENUMBRAL",
    LightSource = coreKernels.ID.Sun,
    Observer = kernels.ID.NewHorizons,
    Body = kernels.ID.Charon,
    BodyFrame = kernels.Frame.Charon,
    Aberration = "NONE"
  },
  GUI = {
    Name = "Charon Shadow",
    Path = "/Solar System/Dwarf Planets/Pluto",
    Focusable = false
  }
}


asset.onInitialize(function()
  openspace.addSceneGraphNode(CharonProjection)
  openspace.addSceneGraphNode(CharonText)
  openspace.addSceneGraphNode(CharonShadow)
end)

asset.onDeinitialize(function()
  openspace.removeSceneGraphNode(CharonShadow)
  openspace.removeSceneGraphNode(CharonText)
  openspace.removeSceneGraphNode(CharonProjection)
end)

asset.export(CharonProjection)
asset.export(CharonText)
asset.export(CharonShadow)