This page contains information about V-Ray's standalone Irradiance Map Viewer tool.

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The irradiance Map Viewer is used to view, merge and save irradiance map files created by V-Ray. It allows the user to navigate around a 3d projected version of a scene to view were GI samples were taken during the rendering process.

Note: The viewer is a standalone program and does not require the V-Ray host application (3ds Max, Maya, MODO, etc.) to be running.



This external tool is installed with V-Ray and its executable (imapviewer.exe) can typically be found: 

Windows: C:\Program Files\Chaos Group\V-Ray\host application\bin\

Linux: /usr/ChaosGroup/V-Ray/host application/bin/ 

macOS: /Applications/ChaosGroup/V-Ray/host application/

A shortcut to the irradiance map viewer is also installed in the Start Menu.



There are several methods of running the irradiance map viewer, which are outlined below.

The simplest way is to double-click the imapviewer.exe file. This will bring up an Open File dialog box that lets you browse for a light map to open. This is the same as starting the irradiance map viewer from the Start Menu. The menus of the program allow you to do various things with the light map (merging and saving etc).

You can also run the irradiance map viewer from the command line. In this case there are several possible choices:

If you type just

> imapviewer

on the command line, this is the same as double-clicking the file. It will bring up the File Open dialog for selecting an irradiance map or a light cache map file.

You can also type

> imapviewer <filename>

where  <filename>  is the name of an irradiance map or a light cache map file. This file will be opened automatically.

A third way is to use the viewer to merge several maps into one:

> imapviewer -load <map1> -load <map2> ... [-save<finalmap>] [-nodisplay]

This will load the specified maps and combine them into one light map of the same type. If the -save option is specified, the result will be written to the given file. If the -nodisplay option is specified, the resulting map will not be displayed (otherwise the viewer will display the final result). 




[-incremental] -load <filename> {-load <filename>} [-save <filename>]

Merges the specified irradiance/light maps and writes them to the specified file.

If the -incremental option is specified, the imapviewer will discard samples that fall in areas where there is already sufficient information. This option must be specified before any -load options.

-infoPrints out information about the current irradiance map.
-noDisplayWhen this option is specified, the resulting map will not be displayed (otherwise the viewer will display the final result).
-up_axis [z|y]Chooses the up axis (default is z).
-convert <filenameFrom> <filenameTo.pts> [-rgb]Converts the irradiance map file into a PTS file.
-helpPrints a help message.