Function need to pick two heights, which are blocks with attribute (within elevation value)
Enter textheight: <1.0>:
Select first and then second height and pick new position for interpolated height.
It displayed temporay a magenta line, in the middle Slope(%) and Distance(m). The height on the cursor is calculated between selected heights.
Pick a Position to create new height. Automatically it sets block with name "Level" and attribute "Elevation" within interpolated heightvalue.
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