Hi folks.
To add to Dave's post, don't forget that you can orbit, pan and zoom even in the middle of an operation.
For example, you can click to start a line, orbit to see the target where you want it and finally click on the target to finish the line.
Another example: you want to add a circle whose center is on an endpoint located in a maze of complex geometry and then extend it on another endpoint that is hideen inside another complex geometry. The procedure could be like this:
1 - Pan, orbit and zoom in on the geometry to be used to attach the center of the circle.
2 - Select the Circle Tool.
3 - Click on the required endpoint to start the circle, making sure that its orientation is correct.
4 - Zoom out, pan and orbit in order to bring the target point in view.
5 - Switch to X-Ray Mode to actually see the target point inside its enclosing geometry.
6 - Zoom in on this target point.
7 - Click on the target point to complete the circle.
8 - Turn X-Ray mode off.
Steps 1 and 2 can be reversed as can steps 4 and 5 or 5 and 6.
The best is to experiment with these facilities. After a while, you will begin to appreciate the flexibility and power of SketchUp.
Just ideas.
