Usage
feSpotLight(x = unit(0, "npc"), y = unit(0, "npc"), z = unit(0, "npc"), pointsAtX = unit(1, "npc"), pointsAtY = unit(1, "npc"), pointsAtZ = unit(0, "npc"), zdim = "x", default.units = "npc", specularExponent = 1, limitingConeAngle = NA, ...)
Arguments
x
A numeric vector or unit object specifying the x-location of the
light source.
y
A numeric vector or unit object specifying the y-location of the
light source.
z
A numeric vector or unit object specifying the z-location of the
light source.
pointsAtX
A numeric vector or unit object specifying the x-location that the
light points at.
pointsAtY
A numeric vector or unit object specifying the y-location that the
light points at.
pointsAtZ
A numeric vector or unit object specifying the z-location that the
light points at.
zdim
Either "x" or "y". Determines the dimension to which
z and pointsAtZ will be located relative to. This is
necessary because R graphics has no concept of a z-dimension.
default.units
A string indicating the default units to use if x, y,
z, pointsAtX, pointsAtY, pointsAtZ are
only given as numeric vectors.
specularExponent
Exponent value controlling the focus for the light source.
limitingConeAngle
If NA, no limiting cone is applied, otherwise a limiting cone
which restricts the region where the light is projected. No light is
projected outside the cone. limitingConeAngle represents the
angle in degrees between the spot light axis (i.e. the axis between
the light source and the point to which it is pointing at) and the
spot light cone.
...
Further arguments to be passed onto fe.