This page provides information on the V-Ray Physical Camera Settings that can be added to standard cameras.

 

Overview


The V-Ray Physical Camera package adds extra functionality to standard Modo cameras. Real-world parameters (f-stop, lens focal length, bokeh, distortion, etc.) can be set up for the virtual CG camera. This package also makes it easier to use light sources with real-world illumination.

To add the V-Ray Physical Camera package to a Modo camera, select a camera and go to V-Ray > Add or Remove V-Ray package > Add V-Ray Physical Camera to selected cameras. Afterwards, the new rollout can be found in the Properties viewport under the V-Ray Physical Camera tab.

 

UI Paths


 

||Select camera|| > V-Ray menu > Add or Remove V-Ray package > Add V-Ray Physical Camera to selected cameras

||Select camera|| > V-Ray Toolbar > Add or Remove V-Ray package button > Add V-Ray Physical Camera to selected cameras

 

 

||V-Ray Toolbox|| > V-Ray Packages rollout > Add V-Ray Physical Camera

 

 

 


Basic Parameters





Type – Determines the type of the camera. This mostly has an effect on the motion blur effect produced by the camera.

Still – Simulates a still photo camera with a regular shutter.
Movie – Simulates a motion-picture camera with a circular shutter.
Video – Simulates a shutter-less video camera with a CCD matrix. 

Zoom Factor – Specifies a zoom factor. Values greater than 1.0 zoom into the image, whereas values below 1.0 zoom out. This is similar to a blow-up rendering of the image.

F-stop – Determines the width of the camera aperture.

Specify Focus – Specifies a focus distance different from the Modo's camera focus distance.

Focus Distance – Sets the focus distance of the physical camera.

Vertical tilt – The vertical tilt for 2-point perspective.

Guess vertical tilt – Click to automatically set the Vertical tilt parameter to achieve 2-point perspective. 

Horizontal tilt – The horizontal tilt for 2-point perspective.

Exposure – When enabled, the F-stopShutter Speed, and ISO settings affect the image brightness.

Vignetting – When enabled, the optical vignetting effect of real-world cameras is simulated.

White balance – Additional modification of the image output. Objects in the scene that have the specified color appear white in the image. Note that only the color hue is taken into consideration; the brightness of the color is ignored.

Shutter Speed – The shutter speed, in inverse seconds, for the Still photographic camera. For example, shutter speed of 1/30s corresponds to a value of 30 for this parameter.

Shutter angle – Shutter angle (in degrees) for the Movie camera.

Shutter offset – Shutter offset (in degrees) for the Movie camera.

Latency – CCD matrix latency, in seconds, for the Video camera.

ISO – Determines the film power (i.e. sensitivity). Smaller values make the image darker, whereas larger values make it brighter.


Bokeh effects






Blades Enable – Defines the shape of the camera aperture. When this option is off, perfectly circular aperture is simulated. When it is on, a polygonal aperture is simulated. This option has effect when depth-of field is enabled.

Blades Num – Specifies the number of blades of the polygonal aperture.

Blades Rotation – Defines the rotation of the blades.

Center Bias – Defines a bias shape for the bokeh effects. Positive values make the outer edge of the bokeh effects brighter, whereas negative values make the center of the effect brighter.

Anisotrophy – Allows stretching of the bokeh effect horizontally or vertically to simulate anamorphic lenses.

Optical Vignetting – Controls the strength of the optical vignetting, also known as cat's eye vignetting. This effect is due to the fact that the shape of the bokeh highlights resembles the shape of the aperture. As the distance to the optical axis increases, the bokeh highlights are progressively narrowed and begin to resemble the shape of a cat's eye. The larger the distance from the image center, the narrower the cat's eye becomes. Optical vignetting tends to be stronger in wide angle lenses and large aperture lenses, but the effect can be noticed with most photographic lenses.

Bitmap aperture – Uses a texture to specify the shape of the aperture.

Bitmap affects exposure – When enabled, the size and shape of the aperture specified by the Bitmap aperture texture affect the exposure of the final image.

Bitmap resolution – Specifies the resolution at which the Bitmap aperture texture is sampled during rendering.


Sampling






Enable DOF – Turns on depth of field sampling.

Enable Motion Blur – Turns on motion blur sampling.

Rolling Shutter Mode – Specifies whether the rolling shutter effect is enabled and its direction. The Rolling Shutter effect options are active only if the Motion Blur is enabled. 

Disabled

Top to bottom

Bottom to top

Left to right

Right to left

Rolling shutter duration – The time for the shutter to pass through the image in 1/seconds.


Distortion






Distortion type – Determines the formula used to calculate distortion for the camera.

Quadratic – The default distortion type. It uses a simplified formula that is easier to calculate than the Cubic method.
Cubic – The distortion type used in some camera tracking programs like SynthEyes, Boujou, etc.
Lens file – An external .lens file is used to determine the distortion for the camera.
Texture – A displacement map from Nuke can be used to determine the camera distortion.

Distortion – Specifies the distortion coefficient for the camera lens. A value of 0.0 means no distortion, positive values produce "barrel" distortion, whereas negative values produce "pillow" distortion.

Distortion texture – Load a texture that determines the camera distortion. This option is only available when Distortion type is set to Texture.

Lens file – Load a .lens file to calculate the camera distortion. This option is only available when Distortion type is set to Lens file.

 

Notes


  • The Horizontal and Vertical shift settings have been removed from the Basic parameters of the camera properties list. Modo's FIlm Offset options may be used instead, if desired.
  • With the V-Ray Physical Camera, V-Ray RT GPU supports Film Offset X / Y .

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