Optimal way of checking an area for obstacles

Beginner Questions
#1

Hi,

I have just joined a Unity project and I have to check an area for a construction system in an RTS.
area

pathfinder
pathfinder499×550 25.6 KB

We currently have a grid system.

I want to check whether multiple areas 0.24*0.24 from the mouse position are free to construct the building.

What’s the proper way of doing it?

#2

Hi

If you just want to check if any nodes in those bounds are unwalkable, then you can use:

var grid = AstarPath.active.data.gridGraph;
var nodes = grid.GetNodesInRegion(bounds);
bool anyUnwalkable = false;
foreach (var node in nodes) {
    if (!node.Walkable) anyUnwalkable = true;
}
if (anyUnwalkable) Debug.LogError("This is a bad place to construct a building");
else Debug.Log("This is a good place to construct a building");

You may also be interested in GraphUpdateUtilities - A* Pathfinding Project