r.cost
r.cost.coordinates - Creates a raster layer of cumulative cost of moving across a raster layer whose cell values represent cost.
Raster (r.*)
ParameterRaster|input|Unit cost layer|False
ParameterPoint|start_coordinates|Coordinates of starting point(s) (E,N)|0,0
ParameterPoint|stop_coordinates|Coordinates of stopping point(s) (E,N)|0,0
ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
ParameterBoolean|-n|Keep null values in output raster layer|True
ParameterNumber|max_cost|Maximum cumulative cost|0|None|0
ParameterNumber|null_cost|Cost assigned to null cells. By default, null cells are excluded|None|None|0
ParameterNumber|memory|Maximum memory to be used in MB|0|None|300
OutputRaster|output|Cumulative cost
OutputRaster|nearest|Cost allocation map