Block Wireframes
Block wireframes may be constrained by selected surfaces or solids. provided those wireframes intercept the specified constraints. Typically, wireframes are extrapolated towards the previous level, to ensure that they intercept a top surface.
If the Bench height is variable and the "planned" toe surface is a limiting factor, a bottom surface extrapolation might be used.
Block wireframes are an input when checking that designed holes adhere to a specified Minimum Distance to Free Face.
If they are not already selected, select the block polygons:
Set the following parameters in the Blast Block Wireframes form:
Wireframe and Direction
On the Wireframe and Direction tab of the Blast Block Wireframes form, set the perpendicular dimensions to the blast block. Towards is UP (Towards previous level) and Bench height is towards the bottom of the pit.
Blast Design
Blasthole Database
The Blasthole Database associated with the current Blast Design layer is saved as part of the form set.
Dimensions
Towards previous level
This parameter is important when you want to consider material not blasted from the previous bench.
The Towards previous level input value is also important when you want to use an end of period survey of the current pit floor as the crest surface. In this scenario, we recommend the specification of a higher Towards previous level value, because in order to be constrained by the crest surface, the original block needs to intercept it. These constraints are specified on the Constraints tab.
Bench Height
Specify a value that will be used to project the polygons to create the benches of the pit.
