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{When visualizing data in a realistically rendered 3D virtual environment, itis often important to represent not only the 3D scene but also overlaidinformation about additional, abstract data. These overlays must be usefullyvisible, i.e. be readable enough to convey the information they represent, butremain unobtrusive to avoid cluttering the view. We take a step towardestablishing guidelines for designing such overlays by studying therelationship between three different patterns (filled, striped and dottedpatterns), two pattern densities, the presence or not of a solid outline, twotypes of background (blank and with trees), and the opacity of the overlay. Foreach combination of factors, participants set the faintest and the strongestacceptable opacity values. Results from this first study suggest that i) rangesof acceptable opacities are around 20-70%, that ii) ranges can be extended by5% by using an outline, and that iii) ranges shift based on features likepattern and density.

A Study of Opacity Ranges for Transparent Overlays in 3D Landscapes