RHINO network camera Manual do Utilizador descarregar pdf (Página 33)

EV is not actually a parameter found on Maxwell cameras – it is a theoretical value which is continuously figured by the plugin itself.

The ‘Lock exposure to EV’ option is provided for one basic reason: while exposure may be adjusted manually using different

combinations of fStop, Shutter, and ISO, it is possible to adjust the DOF (depth of field) on the camera using the fStop without also

affecting the overall exposure of the shot when the plugin is allowed to maintain a given EV. This allows you to adjust the camera’s

exposure and DOF on a totally independent basis, and this makes setting up exposure much easier and more predictable.

fStop

A camera’s fStop refers to the size of its aperture. Lower numbers denote a larger aperture, which exposes the camera’s sensor to

more light. Additionally, a larger aperture reduces the camera’s DOF (i.e. ‘depth of field’), or the distance between the nearest and

furthest points which will appear in focus. Smaller apertures (higher fStop numbers) result in a greater DOF, but expose the camera’s

sensor to less light. Therefore, as the fStop is increased, the exposure must be compensated. This can be done manually, by adjusting

the camera’s shutter or ISO values, or it can be handled automatically by the plugin by enabling the ‘Lock exposure to EV’ option.

When the exposure is locked to the EV, changes to fStop will not affect the overall exposure of the output image, since the plugin will

adjust the camera’s shutter as necessary to maintain a consistent exposure.

ISO

As with a physical camera, the ISO parameter affects the camera sensor’s light-sensitivity. It is not necessary to adjust ISO directly

when ‘Lock exposure to EV’ is enabled.

Shutter

Specified in units of 1/second, this parameter controls how long the camera’s Shutter is to remain open. As with the ISO parameter, it

is not necessary (or even possible, in the interest of simplifying the camera’s operation) to adjust the camera’s Shutter directly when

‘Lock exposure to EV’ is enabled.

Lock Exposure to EV

Enabling this option disables the camera’s ISO and Shutter inputs, since with it enabled, it is not necessary to adjust them directly.

Motion Blur

Enabling this option will cause the plugin to export two different positions for the camera: a ‘previous’ and ‘current’ position. It is the

difference between these two physical positions which will determine how Maxwell calculates motion blur in the rendered output.

While the ‘previous’ frame will be calculated automatically during export of animations, it is also possible to set it explicitly by

positioning the camera as desired and right-clicking the last button (Set camera Initial Position for Motion Blur) in the plugin’s

Animation toolbar. Doing so will cause the camera’s position to be stored in order that it may later be used during export.

Film Back

The parameters in this group are used to control the size and position of the camera’s film.

Size (w/h)

Specified in millimeters, these inputs simply determine the size of the film. When the plugin is set to use ‘Viewport’ Resolution Mode

(more on this later), the plugin will manage the film size in such a way as to maintain a perspective match between the Rhino viewport

and the rendered image.

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RHINO network camera Manual do Utilizador Página 33