| SourcePoint(EngineNode, IQuantity) | Returns an ISourcePoint for the node and quantity. It returns the first quantity of that type that is offered, and null if the quantity is not offered. |
| SourcePoint(EngineReach, Int32, IQuantity) | Returns an ISourcePoint for the gridpoint and quantity. It returns the first quantity of that type that is offered, and null if the quantity is not offered. |