VRayPhysicalCamera examples
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Example 1: exposure control - f-number (f-stop)
Example 2: exposure control -
Shutter speed
Example 3: exposure control -
Film
speed (ISO)
Example 4: Zoom factor
Example 5: Vertical shift
(Camera
Correction)
Example 6: Distortion
Example 7: Vignetting
Example 8: White balance
Example 9: Depth of Field (DOF)
Example 10: Motion Blur (MB)
Note: All the images are rendered
using
the
VRaySun and VRaySky set with their default parameters.
Example 1: exposure
control - f-number (f-stop)
This parameter controls the aperture size of the virtual
camera. Lowering the f-number
value increases the aperture size and so makes the image brighter,
since more light enters the camera.
In reverse, increasing the f-number
makes the image darker, as the aperture is closed. This
parameter also determines the amount of the DOF effect, see Example 9.
Exposure
is
on, Shutter speed is 60.0,
ISO is 200, Vignetting
is on, White balance is white.
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f-number
is
8.0
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f-number
is 6.0
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f-number
is 4.0
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Example 2: exposure
control - Shutter speed
This parameter determines the exposure time for the
virtual camera. The longer this time is (small Shutter speed value), the
brighter the image would be. In reverese - if the exposure time is
shorter (high Shutter speed
value), the image would get darker. This parameter also affects the
motion blur effect, see Example 10.
Exposure
is
on, f-number is 8.0, ISO
is
200, Vignetting is on, White
balance is white.
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Shutter
speed is 60.0
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Shutter
speed is 30.0
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Shutter
speed is 125.0
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Example 3: Exposure
control: film speed (ISO )
This parameter determines the sensitivity of the film and so
the brightness of
the image. If the film speed (ISO) is high (film is more sensitive to
the light),
the image is brighter. Lower ISO values mean that the film is less
sensitive and
produces a darker image.
Exposure
is on, Shutter
Speed is 60.0,
f-number is 8.0, Vignetting
is on, White balance is white.
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ISO
is 400
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ISO
is 800
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ISO
is 1600
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Example 4: Zoom factor
This parameter determines the zooming (In and Out) of the
final image. It doesn't move the camera forward nor backwards.
Exposure
is on, f-number is 8.0, Shutter speed is 60.0,
ISO is 200.0,
Vignetting is on,
White
balance
is white
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Zoom
factor is 1.0
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Zoom
factor is 2.0
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Zoom
factor is 0.5
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Example 5: Vertical
shift (Camera Correction)
Using this parameter you can archive the so called "2
point perspective". To have that done automatically, use the
Guess
vertical
shift button.
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vertical
shift: Guess (2 point)
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vertical
shift: -0.5
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vertical
shift: 0.5
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Example 6: Distortion
The difference between the two types of distortion is
slightly visible. The Cubic
type should be used in some camera tracking programs
like SynthEyes, Boujou etc.
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Distortion
is
1.0, Distortion type is Quadratic
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Distortion
is
-1.0, Distortion type is Quadratic
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Distortion
is
1.0, Distortion type is Cubic
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Distortion
is
-1.0, Distortion type is Cubic
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Example 7: Vignetting
This parameter controls the simulating the optical
vignetting effect of real-world
cameras.
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Vignetting
is 0.0 (vignetting is
disabled)
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Vignetting
is 1.0
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Example 8: White balance
Using the white balance color allows additional modification
of the image output. Objects in the scene that have the specified color
will appear white in the image. E.g. for daylight scenes this should be
peach color to compensate for the color of the sun light etc.
Exposure is on,
f-number is 8.0, Shutter speed is 200.0,
ISO is 200.0,
Vignetting is on
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White
balance is white
(255,255,255)
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White
balance is blueish
(145,65,255)
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White
balance is peach
(20,55,245)
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Example
9: Depth Of Field (DOF)
To enable the DOF effect you need to turn on the Depth-of-field
option in the Sampling
rollout of the physical camera. The effect is most strongly seen when
the camera is close to
some object, like when doing a "macro" photo. For a strong DOF
effect, the camera aperture must be open wide
(i.e. small f-number
value). That may lead to a very burnt and bright image, so to preserve
the same
illuminosity over the whole image, the shutter
speed must shortened. And at last but not at least the focus distance determines
which part of the scene will be actually on focus. To get the focus
near, you would need a small value and reverse - higher value for far
focus.
Exposure is on,
f-number is 1.0, Shutter speed is 4000.0,
ISO is 200.0,
Vignetting is on
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DOF
is off
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DOF
is on, Focus distance is 400
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DOF
is on, Focus distance is 4000
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Example
10: Motion Blur (MB)
To enable the motion blur effect you need to turn
on the
Motion
blur checkbox
in the
Sampling
rollout of the physical camera. The amount of the motion blur
is determined by the
speed
of the moving object itself as well as the
Shutter
speed setting of the camera. Long shutter speeds will
produce more
motion blur, as the movement of the object is tracked over a longer in
time. In reverse, short shutter
speeds will produce less motion blur effect. Keep in mind
that to preserve the same illuminosity over the whole image, the
f-number value has to be
corrected as well.
Note that in the example the far object is moving quicker
than the
near one, which cases the difference in the motion blur effects.
Exposure
is
on,
ISO is
200.0,
Vignetting
is
on
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Motion
blur is off
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Motion
blur is on,
f-number is
16.0, Shutter speed is 30.0
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Motion
blur is on,
f-number is
8.0, Shutter speed is 125.0
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