Brand new to Sketchup and 3D so go easy on me please.
The attached image shows the outline of a small pond (it’s actually a sinkhole). The dots in the center area are points where the depth was measured, and the dimensions of the outline and location of dots are known. I have managed to create the outline in SU using a translucent overlay, and now I want to create lines from the surface down to (or maybe invert this “pond” and go “up to” to make it easier on my brain) the measured depths at the points shown. Then I figured I would create solids from the outline to the ends of my depth lines, group them all together and then have SU measure the volume. Failed miserably at that, starting with creating depth lines. Any suggestions would be appreciated. (Remember I’m really really new at this.)