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vrayVFBGetRegionEnabled() - return true or false depending on whether the
V-Ray VFB render region option is enabled or not.
vrayVFBGetRegion() - return an array with four integer elements, representing
the pixel coordinates of the VFB render region (left, top, right, bottom).
The left and top coordinates are included in the region, the right and
bottom one are not.
vrayVFBSetRegionEnabled <onOff> - turn on or off the VFB region render option.
<onOff> is either true or false.
vrayVFBSetRegion left top right botton - set the render region to the specified
coordinates.
vrayVFBGetNumChannels - return the number of channels (render elements) in the
V-Ray VFB. This will return 0 if the VFB is not initialized or does not
store any data.
vrayVFBGetChannelName i - return the name of the i-th channel. Indices start
from 1.
vrayVFBGetChannelType i - return the storage type of the i-th channel. Indices
start from 1. The return value specifies the type of data for each pixel in
the given channel:
0 - the index is not valid or the VFB does not store an image;
1 - a single floating-point number (this is used f.e. for the z-depth
channels);
2 - three floating-point numbers (this is used for regular color
channels);
3 - two floating-point numbers;
4 - a single integer number (used f.e. by the render ID and material ID
elements);
5 - three signed floating-point numbers (this is used f.e. for normals
and world position channels).
vrayVFBGetChannelAlias i - return the alias for the i-th channel. Indices start
from 1. See the RegionChannelAlias enum in the file "pixelbuffer.h" from
the V-Ray SDK.
vrayVFBGetChannelBitmap i - return the contents of the specified channel as a
3ds Max bitmap. Indices start from 1. This will return undefined if the
channel index is not valid or the VFB does not contain any data.
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