Modelling underground data

Task: Model underground data

1. Click Reset graphics .
2. Open lev200.str in Graphics.

Floor and back strings are displayed.



3. Choose Display > Strings > With string numbers.
4. Enter the information as shown, and click Apply.



Note: In this case, the string numbers for the backs are 2 and 30003 and for the floor are 1 and 1001. String 30003 is a spot height string. You will need to create separate DTM files for the backs and the floors.

5. Choose File > Save > string/DTM.
6. Enter the information as shown, and click Apply.



Note: This creates a string file containing just the back strings. Notice that the separator for the string range is a semicolon. 

7. Choose File > Save > string/DTM.
8. Enter the information as shown, and click Apply.



Note: This will create a string file containing just the floor strings. Notice that the separator for the string range is a semicolon. 

9. Click Reset graphics .
10. Open back1.str in Graphics.

Strings 2 and 30003 are displayed.

11. Choose Inquire > Segment Properties, and click on each segment to check its direction.

The pillar segment is anti-clockwise within an enclosing outer boundary segment that is clockwise.

12. Choose Surfaces > Create a DTM from layer.
13. Enter the information as shown, and click Apply.



14. Choose Surfaces > Clip or intersect DTMs > Clip DTM with string.

You are prompted to select the trisolation, then a string.

15. Click string 2 (the pillar and wall pickup string).
16. Enter the information as shown, and click Apply.



The underground spot height string is displayed.



Note: The DTM has been clipped correctly because of the string directions set for the walls and pillars.

17. Choose File > Save > string/DTM.
18. Enter the information shown, and click Apply.



19. Click Reset graphics .
20. Open floor1.str in Graphics.
21. Choose Surfaces > Create DTM from layer.
22. Enter the information as shown, and click Apply.



23. Choose Surfaces > Clip or intersect DTMs > Clip DTM with string

You are prompted to select the trisolation, and then a string.

24. Click string 1.
25. Enter the information as shown, and click Apply.



The underground backs are displayed.



26. Save floor1.dtm.
27. Click Reset graphics .

Now that both clipped DTMs have been created, you will stitch together the sides to create a closed, valid solid model.

28. Open and append back1.dtm and floor1.dtm into the main graphics layer.

Note: To append the DTMs to the same layer, hold down the CTRL key and drag the files into Graphics.

29. Choose Solids > Edit trisolation > Renumber.
30. Click back1.dtm.
31. Enter the information as shown, and click Apply.



32. Click floor1.dtm.
33. Enter the information as shown, and click Apply.



Notice that the old trisolation number is 2 in this case.

34. Press ESC.
35. Save the file as drives1.dtm.

Note: When performing solids modelling, it is good practice to save your work regularly.

36. Click Reset graphics .
37. Open drives1.dtm in Graphics.
38. Choose Display > Strings > With string numbers.
39. Enter the information as shown, and click Apply.



40. Choose Solids > Triangulate > Between segments.
41. Enter the information as shown, and click Apply.



42. Following the prompts from the function line, click first the outer back string, and then the outer floor string
43. Press ESC.

Repeat the process for the pillar.

44. Choose Solids > Triangulate > Between segments.
45. Enter the information as shown, and click Apply.



46. Following the prompt from the function line, click first the top string of the pillar, and then the bottom string of the pillar.
47. Press ESC.

The underground result is displayed.



48. Save drives1.dtm.
49. Choose Solids > Validation > Validate object/trisolation.
50. Enter the information as shown, and click Apply.



The validation report is displayed.



51. Choose Solids > Solids tools > Report volume of solids.
52. Enter the information as shown, and click Apply.



The Solid Modelling Object report is displayed.

Note: To see all of the steps performed in this task, run _15_create_underground_model.tcl. You need to click Apply on any forms presented.