Autodesk LIGHTSCAPE, Manual

Page: 79 / 362

Importing a LightWave Scene
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Instance
Select this option to create a layer for each instance
of each LightWave object.
Object
Select this option to create a layer for each LightWave
object. All instances of the same object are placed in
the same layer.
Single
Select this option to create a single layer. All objects
are placed in this layer. You can enter a layer name in
the Layer Creation Name box. If you do not enter a
name, the name of the LightWave scene is used by
default.
Converting Lights
Choose the options for converting lights, as
described in the following sections. The scaling
intensity and matching intensity methods are mutu-
ally exclusive—you must choose one or the other.
Maximum Light Intensity Scale
Enable this option to multiply the value you enter by
the LightWave intensity. The result becomes the
intensity of the converted light in candelas.
Light Intensity at a Distance
Enable this option to calculate the brightness of a
light by matching the apparent intensity of the Light-
Wave light to that in Lightscape at the specified
distance. This can provide a good estimate of the
general brightness of a LightWave scene.
The default distance is 2.5 meters (approximately 8
feet), which is an estimate for typical interior
models. If you use targeted spotlights, you can enter
the average distance between the lights and their
targets.
Use Attenuation
If you use range attenuation in your lights, enable
this option to estimate the brightness of the light
based on the range attenuation. This method
matches the light intensity at 40% of the distance to
the range limit.
If you enable this option, all lights with range atten-
uation will be converted using this method and all
other lights will be converted using either the scaling
or matching intensity methods. This method also
properly inverts the brightness of lights imported
from Lightscape solutions.
Preserve Spotlight Angles
Enable this option to set the beam angle to the Light-
Wave cone angle. Disable this option to set the cone
angle for a converted spotlight to the angle where the
LightWave spotlight illuminates at one-half inten-
sity. This matches the illumination of a Lightscape
spotlight at the beam angle.
If you want Lightscape to illuminate a scene the same
way as LightWave, disable this option since the
converted LightWave spotlights will have signifi-
cantly different intensity distributions. Enable this
option when you want to specify the spotlight angles
that Lightscape uses in LightWave.