A great new feature of v4 is the interactive 'test lighting' mode. It is ON by default and shown in Preferences by a blue eyecon:
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Tourtool can start immediately and only the part of the model in view will be lit. This feature allows you to test quickly the lighting settings because you can change them in LightUp Preferences (Sunlight, change light colors, change IES, change AO etc) and immediately see the result.
Once you're happy with your lighting setup, you can switch off 'test lighting' and do a full lighting (with high quality filtering) as before with LightUp.
New LightUp PLayer for Macintosh and Windows are also available for download.
