User`s guide

Chapter 7 Working with Shapes
366
Light Tab (for 3D Primitives)
Parameter Description
Ambient Adjusts the total amount of diffuse light on the
image. Illuminates or darkens the image evenly and
is unaffected by any other lighting parameters.
• The default setting of 100 does not add or
subtract ambient light from the source image.
• Decrease this setting to make the image darker
before applying other lights.
Color Controls the color of the applied light (Specular and
Diffuse lights).
To access the system color picker, click the color
chip.
Light X
Light Y
Position the light source in space by moving the
light parallel to the image plane along the X and Y
axes.
Distance Positions the depth of the light source relative to the
image plane.
• A Distance value of 100 places the light one
source width above the image plane.
• A negative Distance value places the light
behind the image plane.
The light is seen only if the object is rotated or
displaced so that all or part of it is behind the light
source (the light source always points in toward the
object not out at the viewer).
Specular Simulates lighting a glossy surface from a point
source creating a small spot of intense light whose
falloff can vary.
Increase Specular to add light to the surface.
Diffuse Determines the amount of non-directional diffuse
light applied to the object.
Increase Diffuse to brighten the object uniformly.