About setup of lens flare is described here.
Lens flare is an effect that appears as circles or hexagons caused by
internal reflections of the lens when a camera directs to the sun. For
landscape against light this effect makes the picture very realistic.
It is recommended that the flare setups are found out from the library
or just modified a little from them since the flare setups are very complicated.
Flare setup consists of a combination of the following components.
(1) GlowEach setup can be enabled and disabled by the check boxes on the bottom left.The light around the light source (sun). It differs from the corona.
(2) Ring
The light ring around the light source (sun).
(3) Star
The light rays from the light source (sun) like a star.
(4) Flare
The light around the light source (sun) with thin brightness.
(5) Secondary
The light with circle or figure of camera iris that appears between the light source (sun) and the center of the camera lens. This mechanism is very complicated.
(6) Offscreen
specifies whether lens flare is displayed when the light source (sun) is located outside of the frame.
If checked the lens flare will be displayed even if the sun is outside of the frame. Normally this should be unchecked.(7) Strength
You can modify the flare strength, If you want.
Detail setups for each effect are done on the tabs on the right side.
The preview with the lens flare takes much time. For a preview of only the lens flare can be seen by clicking the [preview] button on the flare tab.
Detail Setups
The setup of the lens flare is done by combining
gradation patterns.
To setup the gradation pattern markers on each
controls are used.
When the marker is clicked you can modify the
color. By dragging the marker the gradation pattern can be changed. The
markers on the both end can not be moved. To add a new marker click where
no marker is on the control. To delete the marker drag it to the outside
of the control.
There are following patterns as gradation pattern.
(a) Ring Colorspecifies color gradation in circle patterns from inside to outside.
(b) Ring Transparency
specifies transparency gradation in circle patterns from inside to outside. This pattern refers only to the brightness. Coloring does not effect. The higher the brightness the less transparency. Normally this is set up by gray scale.
(c) Radial Color
specifies color gradation in radial patterns from 0 to 360 degree in counter clockwise.
(d) Radial Transparency
specifies transparency in radial patterns from 0 to 360 degree in counter clockwise. This pattern refers only to the brightness. Coloring does not effect. The higher the brightness the less transparency. Normally this is set up by gray scale.
(e) Radial Size
specifies size gradation in radial patterns from 0 to 360 degree in counter clockwise. This pattern refers only to the brightness. Coloring does not effect. The higher the brightness the larger the size. Normally this is set up by gray scale.
Details of each component are listed below.
(1) Glowis a combination of ring color, ring transparency and radial size settings.
Please be careful to set up a proper transparency so that the glow effect becomes not too strong.(2) Ring
is a combination of ring color, ring transparency, and radial size settings.
It is not always necessary to enable the ring. The ring transparency should be thin enough to obtain a reality.(3) Star
is a combination of ring color, ring transparency, and radial size settings.
Also ray number, ray sharpness, and anisotropy are specified. The anisotropy specifies whether the ray sharpness differs from one ray to another. A large anisotropy make large differences among the rays.
Length of the rays is specified by the radial size. Please refer to library settings.(4) Ambient
is a combination of ring color, ring transparency, and radial size settings. Normally the ambient is not necessary since it is very thin light.
(5) Secondary
can be generated more than one.
One secondary is a combination of ring color, ring transparency, radial color, radial transparency and radial size settings.
To specify the location of the secondary appearance adjust lens position. 0 is the center of the lens 1000 is the position of the light source.
To add a new secondary click [New] button. To delete a secondary click [>delete] button. To copy setting of a secondary use [Copy] and [Paste]. button.