loch(1) Therion model viewer


loch [FILE]


This manual page documents loch, which is part of the therion-viewer package.

loch is a 3D viewer which displays .lox files produced by therion and allows them to be examined.


loch optionally takes a .lox, Survex .3d or Compass .plt file to open.


Key and Mouse Controls

FunctionMouse actionKey
Zoom & RotateLeft click + drag
Zoom onlyLeft click + drag up/down, then hold left and click rightCtrl + Up/Down
Rotate onlyLeft click + drag left/right, then hold left and click rightLeft/Right
PanRight click + dragShift + Arrows
TiltMiddle (wheel) click + drag or wheel rotateUp/Down
Full screenLeft double click F11
Context menuRight click

If continuous rotation is turned on, then rotation mouse movements change the speed or direction of rotation. If rotation is locked, then rotation mouse movements have no effect.


Loch is able to render large bitmaps that can be afterwards post processed and printed. Bitmaps can be exported in PDF, PNG or BMP formats. Configuration of export is done via the Rendering setup dialog. You can set the following features:

Size and Scaling

Screen shot: Screen copy will be saved into a file with no other changes.

Image width: The screen image will be exported with the specified width.

Image height: The screen image will be exported with the specified height.

Scale: The screen image will be exported with the specified scale.

Image options

Rendering resolution: Resolution of the image file used when image size or scale are specified.

Image size: Image size in pixels and uncompressed bytes calculated from previous settings.

White background: Force white background in exported image.


Sometimes empty rectangles appear in off screen rendered file. Changing the window size usually helps.

* Crashes have been observed on intel graphics cards unless the
 texture initialisations are removed in the code.

* Stereo mode does not work correctly on some graphics adapters.

* This help does not work.


This manual page was adapted from existing docs by Wookey [email protected] for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public Licence, Version 2 or any later version published by the Free Software Foundation.