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| Each of the three main dialogs for material, background and light settings contains a large preview window that provides various rendering qualities, two different resolutions and an automatic or manual update, respectively. These options are the same for all dialogs.
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| In addition to these basic options each preview window provides a selector box right beneath the window that offers various selections of views and object groups for the preview rendering, arranged in regard to the specific demands for the individual dialog.
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| Resolution - Click on the magnifying glass to change between the two possible preview picture resolutions (240 * 180 or 160 * 120 pixels).
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| Quality
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 The spheres underneath the preview window represent the four possible rendering grades for the preview calculation:
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| 1. Simple Scanline algorithm.
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| 2. Raytracing, without shadows and antialiasing.
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| 3. Raytracing with shadows.
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| 4. Raytracing with shadows and antialiasing.
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| Auto - If this button is activated then each change in every parameter will cause an immediate redraw of the scene in the preview window. If the <Auto> button is switched off you have to start a redraw manually by operating the <Preview> button. This is advisable when working on very complex scenes and you want to adjust several parameters in a row before starting a new preview calculation.
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| Stop Preview Calculation (ESC)
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| If a preview calculation of a very complex scene lasts to long you can interrupt the preview any time by pressing the <ESC> key on your keyboard. Of course complex scenes, for instance a landscape scene consisting out of millions of points and facets, ought to be rendered in a low grade rendering mode, preferable in raytracing mode without shadows and antialiasing.
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