# Loch Help

## Table of contents

- Basic control
- Off screen rendering
- Known bugs

## Basic control

Function | Mouse action | Key
Zoom & Rotate | Left click + drag |
Zoom only | Left click + drag up/down, then hold left and click right | Ctrl + Up/Down
Rotate only | Left click + drag left/right, then hold left and click right | Left/Right
Pan | Right click + drag | Shift + Arrows
Tilt | Middle (wheel) click + drag or wheel rotate | Up/Down
Full screen | Left double click | F11
Context menu | Right 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.

## Off screen rendering

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 dove via Rendering setup dialog. You can set following features:

### Size and scaling

Screen shot | Screen copy will be saved into file with no other changes.
Image width | Contents of the screen will have given with.
Image height | Contents of the screen will have given height.
Scale | Contents of the screen will be exported in given 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.

## Known bugs

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

### Windows specific

- Texture gets strange color pattern. Reloading model seems to help.
- Passage coloring gets random. Restarting the program/computer helps.

### Linux specific

- Stereo mode does not work correctly on some graphic adapters.
- This help does not work.