Instructions for opening laser data points from Grapevine Lake

1.  Save the attached file from e-mail to something you can remember.  The filename
	for the purposes of this instruction set will be grape.txt.

2.  Launch gocad 2.0.7 in Advanced Mode

3.  Choose File -> Import Objects -> Raw Files -> Point Set/Curve -> X Y Z ASCII File as Pointset

4.  Open grape.txt in the dialog and choose OK.

5.  Click on the plus sign to the left of Points Set.

6.  Click on the square box just to the left of "grape" to make the data set visible.  Points
	should appear in the main window.

7.  The main window is a 3D viewer.  Rotate with the left mouse button, translate with the middle
	(if available), and zoom with the right.

8.  Clicking on the show axes icon (the on the top button bar with the X Y Z and colored lines
	on it) will show the axes in the lower left corner.

9.  Choose General Mode -> PointSet,  this switches the menu to PointSet Mode

10. Choose Region -> Region Editor...

11. Choose the 'folder' icon in the Region Editor dialog to create a new region.

12. Rotate/Translate/Zoom the main window to allow easy access to a particular piece
	of the data set.  We'll be dividing the data set up into 2 or 3 parts for
	this example.

13. In the Region Editor dialog, choose the 'Add nodes selected inside the polygon' button
	(the one with the filled polygon).

14. Your mouse in the main window will now be a crosshair - draw a polygon around the region
	you've chosen by adding points with the left mouse button, deleting them with the
	right button (if necessary), and finishing with the middle mouse button.

15. When selected, the points will turn into triangles in the main viewer.

16. Choose New -> From Object Region

17. Name your new data set Region1, and make sure that the Object field says 'grape' and
	the region field says 'Region_1'.

18. Uncheck 'grape' from the PontsSet list.  Now the main window will show only the points
	in the selected region.

19. Choose PointSet Mode -> Curve.

20. Choose New -> Convex Hull -> Of Object

21. Name your Convex Hull 'chull1' and verify that the object field is Region1.

22. Choose OK - A line that surrounds your region will appear.

23. Choose Edit -> Densify, set Maximum Length to 1, and choose OK.  Points will be
	added to the curve so that there's one point per meter.

24. Choose Curve Mode -> Surface

25. Choose New -> From Closed Curve

26. Name your surface 'Surf1' and choose OK.  The mouse will become a crosshair.  Choose
	the line that surrounds your your points.  A surface will appear in the main window.

27. Choose Constraints -> Control Points -> Set Control Points.

28. Use the pull down menu from control points and set it to ONLY Region1.  Blue lines will
	appear from the data points to the surface.  Optionally you can click on the button
	next to Advanced to set the shooting direction.  Generally you'll want to choose
	'optimize shooting direction'.

29. Choose Interpolation -> On Entire Surface.

30. Hit the Apply button several times until the surface no longer appears to change (generally
	less than 10 times).

31. The surface should now (mostly) fit the control points.  Move it around in the main window
	to verify that it is what you want.

32.  Repeat steps 11-31 until you've made surfaces for the entire data set.





29.