There's a little icon at the right of the screen that turns the horizonline in the wireview on and of. It's a little rectangle with a line through the middle. If you click it and the part of the rectangle under the the line will appear (or disappear). This icon switches the horizonline on and of. If you have the horizonline turned off you can view wireframes of objects that are placed ower then 0 bryce units. If the horizonline is visible you will not ba able to see under 0 bryce units.

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