Sometimes we want to map a block model field that isn't coded in the original block model. Custom variables allow us to write complex logic in a readable and reusable way, which can then be mixed with other inline formulas in the block model mappings.
To create a custom variable:
- Go to Setup > Block Model > Edit > Reserve Model Generator.
- Click "Custom Variables" to open the script editor.
- Clear all text from the code editor.
- Replace it with the sample code below.
Block model with inline formula.
Custom variable editor.
Block model with custom variable.
Dry Tonnes
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class DryTonnes : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
double density = context.N("DENSITY");
double volume = context.N("XINC")*context.N("YINC")*context.N("ZINC");
return (density > 0 ? density * volume : 0);
}
}
Grade Bins
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
if(fe > 60) return "hg";
else if(fe > 58) return "mg";
else if(fe > 57.5) return "lg1";
else if(fe > 56) return "lg2";
else if(fe > 50) return "minw";
else return "w";
}
}
Multiple Grade Bins
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
double al = context.N("al");
string geology = context.T("geology");
string fe_bin;
if(fe > 60)
{
fe_bin = "60";
}
else if(fe > 55)
{
fe = Math.Floor(fe);
fe_bin = fe.ToString("#,##0");
}
else
{
fe_bin = "50";
}
string al_bin;
if(al < 3)
{
al_bin = "3";
}
else if(al < 6)
{
al = Math.Ceil(al);
al_bin = al.ToString("#,##0");
}
else
{
al_bin = "9";
}
string geoClass = "1";
if(geology.Equals("detrital", StringComparison.OrdinalIgnoreCase))
{
geoClass = "2";
}
return fe_bin + "_" + al_bin + "_" + geoClass;
}
}
Ore Ratio
Rapid Reserver block model fields cannot report Stripping Ratio, because Stripping Ratio is not a sum or weight average type field. Instead, we can report ore ratio, which is the weight average of ore tonnes over total tonnes.
To do this we can set up a weight-averaged field called 'OreRatio' as a child of dryTonnes or wetTonnes (whichever you want to report). This field will report a 1 for ore and a 0 for waste. The weight average of the 1s and 0s across a blast becomes the ore ratio.
Ore Ratio
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class OreRatio : IDoubleCustomVariable
{
List<string> ores = new List<string>(){ "hg", "mg", "lg" }; //all lower case
public double GetNumber(CustomVariablesContext context)
{
string matType = context.T("mattype").ToLower(); //material type field from original block model
bool isOre = ores.Any(ore => matType.StartsWith(ore));
if(isOre) return 1;
else return 0;
}
}
Multiple Custom Variables
To create multiple custom variables, a class implementing the IDoubleCustomVariable or ITextCustomVariable interface needs to be created for each variable. These classes need to be listed under one another in the Custom Variables Script Editor, as shown in the examples below.
Multiple Custom Variables
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
if(fe > 60) return "hg";
else if(fe > 58) return "mg";
else if(fe > 57.5) return "lg1";
else if(fe > 56) return "lg2";
else if(fe > 50) return "minw";
else return "w";
}
}
public class DryTonnes : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
double density = context.N("DENSITY");
double volume = context.N("XINC")*context.N("YINC")*context.N("ZINC");
return (density > 0 ? density * volume : 0);
}
}
Multiple variables with shared logic
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
//block model 1 has a "parcel1" variable
public class Parcel1 : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
string parcel = context.T("mtype"); //block model 1 field
return ParcelResolver.Parcel(parcel);
}
}
//block model 2 has a "parcel2" variable
public class Parcel2 : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
string parcel = context.T("ioretype"); // block model 2 field
return ParcelResolver.Parcel(parcel);
}
}
//parcel logic is wrapped up in the static ParcelResolver class
public static class ParcelResolver
{
private static List<string> _oreList = new List<string>
{
"hg", "hg1", "bl1", "mg", "lg", "lg1", "lg2", "mw"
};
public static string Parcel(string parcel)
{
if(_oreList.Contains(parcel.ToLower())) return "ore";
else return "waste";
}
}
Access Custom Variable from another Custom Variable
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
if(fe > 60)
return "hg";
else if(fe > 58)
return "mg";
else if(fe > 57.5)
return "lg1";
else if(fe > 56)
return "lg2";
else if(fe > 50)
return "minw";
else
return "w";
}
}
public class Recovery : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
Parcel parcel = new Parcel(); //Create an instance of the Parcel object
string p = parcel.GetText(context); //Call the GetText() method, store the result in variable 'p'
double volume = context.N("XINC")*context.N("YINC")*context.N("ZINC");
if(p == "hglp" )
return volume * 1.20;
else if(p == "hg")
return volume * 1.20;
else if(p == "mg")
return volume * 1.20;
else if(p == "lg1")
return volume * 1.20;
else if(p == "lg2")
return volume * 0.85;
else
return 0;
}
}
If there are no errors during compilation, the custom variables should be listed in the Variables panel.
Block model with more then one custom variable.