The linear measuring tool can be used at any time by pressing the A Button on the HP Reverb controller or the Side Grip Button on the HTC Vive controller. When in measure mode, the laser pointer turns yellow when hovering over a measurable point. It will turn red if the laser doesn't hit anything measurable. TruView VR only allows for one measurement at a time.
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Setup icons and pop-up panels are not measurable. GeoTags and point-clouds are measurable.
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When in measure mode, the laser pointer will snap to the center of a point-cloud point, or to the true position of a GeoTag.
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Measurement labels are always visible and are never occluded.
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Measurement endpoints are always visible and are never occluded.
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Measurement lines can be occluded, but the occluded parts are rendered as dashed lines.