2012

Table Of Contents
Edit Lights
You can edit a light in the palette by double-clicking it, or right-clicking and
choosing Edit on the shortcut menu.
There are six types of light visible in both OpenGL interactive renders and
photorealistic renders:
Ambient lights give a general background light to the scene and therefore
only have Intensity and Color parameters.
Distant lights are directional and so have a location and target. However,
the location and target merely set up an axis down which the light shines,
as these light types are infinitely far away and their beams are parallel. As
well as Intensity and Color parameters, they can also cast shadows in a
photorealistic render.
Eye lights are located at the viewpoint and also only have Intensity and
Color parameters.
Point lights have a location but shine in all directions. They also have an
Intensity and Color and additionally can cast Shadows (only available
in a full photorealistic render).
Spot lights are also directional and therefore have a location and target,
as well as Intensity and Color, and shadow parameters. In addition, they
also have parameters for affecting the lights Fall Off and Cone Angle,
as these light types are not infinitely far away, so do spread their light over
a cone and the intensity does diminish away from the light.
Sun simulates the suns light. The orientation of your model is defined
by North and Up directions. The position of the sun is specified as
Azimuth and Altitude. If the suns Mode includes Position, you can
input your location on earth, the Time (using local time zone) and date
and Presenter will calculate the suns azimuth and altitude for you. If
the suns Mode includes Intensity, Presenter will also calculate an
accurate intensity for the sun based on position, time of year and
atmospheric conditions.
There are an additional three types of light visible only in photorealistic
renders:
Projector lights are used to project an image onto surfaces. You can define
the file of the image to be projected.
Sky simulates the illumination from the sky (but not the direct
contribution due to the sun itself). The orientation of your model is defined
by North and Up directions. The position of the sun is specified as Sun
Altitude and Sun Azimuth. While the direct contribution of the sun is
Use Presenter Lights | 569