r.cost
r.cost.points - Creates a raster layer of cumulative cost of moving across a raster layer whose cell values represent cost from a vector point layer.
Raster (r.*)
ParameterRaster|input|Unit cost layer|False
ParameterVector|start_points|Start points|0|False
ParameterVector|stop_points|Stop points|0|True
ParameterNumber|max_cost|Maximum cumulative cost|None|None|0.0|True
ParameterNumber|null_cost|Cost assigned to null cells. By default, null cells are excluded|None|None|None|True
*ParameterNumber|memory|Maximum memory to be used in MB|0|None|300|True
*ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
*ParameterBoolean|-n|Keep null values in output raster layer|False
OutputRaster|output|Cumulative cost
OutputRaster|nearest|Nearest start points
OutputRaster|outdir|Movement Directions