Figure 11.112.
The same image, before and after applying Lighting filter
This filter is found in
Filters->Light Effectsender->Lighting Effects
This filter simulates the effect you get when you light up a wall with
a spot. It doesn't produce any drop shadows and, of course, doesn't
reveal any new details in dark zones.
9.4.2.
Options
Preview
When Interactive is checked, parameter
setting results are interactively displayed in preview without
modifying the image until you click on OK
button.
If "Interactive" is not checked, changes are displayed in preview
only when you click on the Update button.
This option is useful with a slow computer.
General Options
Figure 11.113.
“Lighting” filter general options
Transparent Background
Transparent Background: Makes
destination image transparent when bumpmap height is zero
(height is zero in black areas of the bumpmapped image).
Create New Image
Create New Image: Creates a new image
when applying filter.
High Quality Preview
High Quality Preview: For quick CPU...
Light
Figure 11.114.
“Light” Options of the Lighting filter
In this tab, you can set light parameters. With
Light 1, 2,...6: You can create six light
sources and work on each of them separately.
Light Type
This filter provides several Light Types
in a drop-down list:
Point: displays a blue point at center
of preview. You can click and drag it to move light all
over the preview.
Directional: the blue point is linked
to preview center by a line which indicates the direction
of light.
None: This deletes the light source
(light may persist...).
Light Source Color
Light Source Color: When you click on
the color dwell, you bring a dialog up where you can
select the light source color.
Intensity
With this option, you can set light intensity.
Position
Position: Determines the light point
position according to three coordinates: X coordinate for
horizontal position, Y for vertical position, Z for source
distance (the light darkens when distance increases). Values
are from -1 to +1.
Direction
This option should allow you to fix the light direction in
its three X, Y
and Z coordinates.
Isolate
With this option, you can decide whether all light sources
must appear in the Preview, or only the source you are
working on.
Lighting Preset
You can save your settings with the Save
and get them back later with the
Open.
Material
Figure 11.115.
“Material” tab of the Lighting filter
These options don't concern light itself, but light reflected by
objects.
Small spheres, on both ends of the input boxes, represent the
action of every option, from its minimum (on the left) to its
maximum (on the right). Help pop ups are more useful.
Glowing
With these option, you can set the amount of original
color to show where no direct light falls.
Bright
With this option, you can set the intensity of original
color when hit directly by a light source.
Shiny
This option controls how intense the highlight will be.
Hell
With this option, higher values make the highlight more
focused.
Metallic
When this option is checked, surfaces look metallic.
Bump Map
Figure 11.116.
“Bumpmap” options of the Lighting filter
In this tab, you can set filter options that give relief to
the image.
Enable Bump Mapping
With this option, bright parts of the image will appear
raised and dark parts will appear depressed. The aspect
depends on the light source position.
Bump Map Image
Bump Map Image: You have to select
there the grey-scale image that will act as a bump map.
Curve
Curve: Four curve types are available:
Linear,
Logarithmic,
Sinusoidal and
Spherical. See Bump Map plug-in for
explanations.
Maximum Height
Maximum Height: This is the maximum
height of bumps.
Environment Map
Figure 11.117.
“Environment map” options
Enable Environment Mapping
When you check this box, the following option is enabled:
Environment Image
Environment Image: You have to select
there a RGB image, present on your screen.
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