Intersect Drillholes with Wireframes Dialog

Generate drillhole wireframe intersection points

To access this dialog:

This command can be used to calculate the points at which selected drillholes intersect specific wireframe surfaces, and write those intersections as a new data points, along with a series of optional attributes, including wireframe thickness values.

Use this command for:

  • Drillhole planning -  for example,  to ensure that there is adequate coverage of the target (define by an existing wireframe(s)).

  • Safety - to determine where existing or planned drillholes intersect underground excavations ( possibly compromising ventilation).

 

Field Details:

Output: select either “Current Object” to have the new points added to the current Points object, or “New Object” to output the points to a new object with the names defined in the adjacent edit box.

Objects: select the checkbox by the side of each wireframe object which should report an intersection with the drillholes. The Pick button (with the cursor arrow and question mark), can be used to enter a mode where wireframes can be selected by clicking on them in the Design or VR windows.

Options: points can be generated optionally for where a drillhole enters a wireframe and/or exits a wireframe. A drillhole is deemed to be entering a wireframe when it has gone from outside the wireframe to the inside, as determined by the triangle orientation set with a tool like wireframe-verify. Drillholes intersecting a DTM will be normally be regarded as entering is when passing from above to below.

Write Attributes: a number of attributes may be optionally included in the generated points data:

  • Copy wireframe data: will copy all the wireframe attributes from the intersected triangle to the associated point created.

  • Copy BHID: will copy the drillhole BHID column to the associated intersection point.

  • Wireframe name: will copy the object name of the wireframe into the user-defined column in the created point (defaults to WRFM)

  • Intersect #: will add the intersection number of the drillhole and the wireframe to the user-defined column in the created point (defaults to INTSCT). Intersection numbers start at 1 for each drillhole and increment for each intersection for the collar to the end-of-hole.

  • Drillhole Depth: will add the downhole depth of the intersection to the user-defined column in the created point (defaults to DEPTH)

  • Enter/Exit flag: will set the user-defined column (defaults to ENTER) to 1 if the drillhole is entering the wireframe, or 0 if its exiting it.

True Thickness: will calculate the true thickness of the wireframe at the point of the intersection, and write it to the user-define column in the created point (defaults to TRUTHICK)

Vertical Thickness: will calculate the vertical thickness of the wireframe at the point of the intersection, and write it to the user-define column in the created point (defaults to VERTTHICK)

Horizontal Thickness: will calculate the horizontal thickness of the wireframe at the point of the intersection, and write it to the user-define column in the created point (defaults to HORTHICK)

 

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The drillholes being used for generating  the intersection points can be selected either before running  the command or when this dialog is displayed, but before clicking OK.

 

About Thickness calculations

Thickness is the distance inside a wireframe from one side to the other. In some cases this may be measured within a closed wireframe, but in others multiple DTMs may represent the interfaces between different volumes. Note that sense of what is inside a wireframe is determined by the direction of the triangle the point is on. For properly verified objects, this should always underneath true DTMs, and inside of fully-closed wireframes.

Vertical Thickness: This is measured directly upwards or downwards (whatever points inside the wireframe), until it hits another triangle from this wireframe, or another on the list. If no other wireframe is hit in this direction, an Absent thickness will be recorded.

Vertical Thickness of a Seam in Section View

Horizontal Thickness: This is measured in a direction perpendicular to the triangle, but forced to be horizontal. This distance is measured in this direction until it hits another triangle from this wireframe, or another on the list. If no other wireframe is hit in this direction, an Absent thickness will be recorded. For vertical triangles, Horizontal Thickness and True Thickness will be the same.

True Thickness: This is measured perpendicularly to the triangle in 3D space, until it hits another triangle from this wireframe, or another on the list. If no other wireframe is hit in this direction, an Absent thickness will be recorded. For horizontal triangles, True Thickness and Vertical Thickness will be the same.


True Thickness of a Seam in Section View

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