Google sketch up uses lines and surfaces.
1 A set of closed lines make a surface
2 You can infer the position of a point to help in lining them up. Click on the start point (green), hover over a point you want to align with (top black), then move to the place you want to end (bottom black). A dot will appear when the new line is aligned with the hover point.
3 When you are on a line your position is shown by various coloured dots.
Green is an end point of a line
Cyan is a mid point of a line
Red is any other point on the line
4 Draw new constructs to or from existing edges, do NOT draw across other sides
WRONG:
RIGHT:
5 To make 3D object, you draw a 2D one and pull/push it out.
This can be done with any surface, they can be pushed in (for example to cut a shape out, or pulled out to create a new 3D solid. For example the back surface could be pulled out and an arc added on top:
6 To make a solid a specific size when pulling it out, start the pull, release the maous then type in the size (10', 10", 10cm, 10m). It will snap to this size.
7 You can use inferring to make one thing the same size as another. You draw the first a specific size (see 6), then start to pull out the second, then move your cursor to the face on the first where you will get a blue dot, then click.
8 You can cut opening in a solid by drawing a shape on a side, then pushing it out.
9 You can move objects and edges. Select them, then chose the move tool, then move.
Here the back top edge has been selected then moved down to create a sloping ceiling. And then the whole object has been selected and moved left across the axes. There, that is all for now.
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