Page 663 - Chief Architect Reference Manual

Electrical Service Specification Dialog

alter the appearance of textures and can outside edge. The default drop off value
be used to achieve special effects. See is 7.5, causes the light intensity to drop
“Color Chooser/Select Color Dialog” on off fairly quickly.
page 203.
Limitations in the OpenGL lighting
model can create a jagged circle of light
The default color of light is pure white,
which has the least affect on the on a large flat surface if the Drop Off
appearance of material colors and textures. Rate value is too low. You can address
this by decreasing the Maximum Triangle
The Angle and Drop Off Rate settings below Size and increasing the Drop off Rate.
are only available for Spot Lights. Check Soft Shadows (Ray Tracing) to
3
• The Tilt Angle controls the angle of the have the selected Point Light source
illumination with respect to the horizon. cast soft shadows in Ray Trace views. Not
A value of -90° points the light straight active for Spot Light sources.
down and a value of 90° points it straight • Specify the Light Diameter, which is
up. 0° is parallel to the horizon. how big the source of illumination
• The Direction Angle defines the appears in Ray Trace views.
direction of the illumination relative to The Offset settings control the location
the ground. 0° is measured horizontally 4 of the selected Light Source relative to
pointing to the right. Positive values the fixture.
rotate in a counter-clockwise direction
from there. Enter a value up to 360°. If • From Base controls how far the light
you enter a negative value, the program source is from the fixture base. The
adds 360° to it when you click OK or fixture base is determined by the surface
press the Tab key. that it is attached to (i.e. wall, floor, or
ceiling).
• The Cut Off Angle controls the angle of
the cone of illumination for Spot Lights • X Position and Y Position allow you to
only. A cone angle of 180° creates a spot position the light source relative to the
light that shines in a half sphere on one center of the fixture, along the floor/
side of the light source. A small cone ceiling.
angle, for example 10°, creates a very Additional Options that affect how the
narrow cone of light. The cut off angle 5 selected light source behaves are
should always be between 0° and 180°. available.
• The Drop Off Rate affects how fast a • Select Use in Camera View to turn the
Spot Light’s intensity drops off from the selected light source on in regular 3D
center of the cone to the outside edge. views only.
Only available for Spot Lights.
• Select Use in Ray Tracing to turn the
selected light source on in ray trace views
A value of 0 produces a cone of light with only.
the same intensity from the center to the

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