Gridmap with static bodies is slow to load

Question

Hello,
I have an issue related to this topic:
https://godotengine.org/qa/27821/how-to-improve-gridmap-performance-octant-size?show=27952#c27952

In short, if I use a 3D GridMap with a meshlibrary composed of Meshes ONLY, the loading of the map is superquick (i´m talking about hundreds of thousands of mesh - if not millions- in a few seconds).
If I go with a meshlibrary composed of StaticBodies (i need them to detect the click of the mouse on the object placed on the gridmap), a simple 10 thousands bodies map will takes several minutes to load, a 50k bodies map will take up to 15-20 minutes.

Point is I was expecting a slow down of the performance, but one would expect adding physics objects would impact mainly on the frame rate, but that´s totally untrue: the framerate remain basically untouched.

I would like to know where this slow loading time came from, why does a static body take more time to appear on the scene than a simple mesh, even before any physic is involved?

Andrea

Comments

i just saw an email saying you replied my post and gave me hopes that you found a solution, just to came here and read this XD

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So you didn't actually read it? When I get my email from this website it shows me what comments I get too.

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nah, i click the link, then read

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I just had a similar problem instancing nodes with static bodies. Not sure if it applies to your case, but in mine, changing the position of the node before adding it as a child solved the problem.

var child = Child.instance()
child.set_position(Vector2(x, y))
parent.add_child(child)

I guess Godot recalculates collisions on each child added and, by default, they would stack on 0, 0, causing the lag.

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This works, thank you!

 # Create many collision shapes
var collisionNode = StaticBody.new()
collisionNode.set_translation(Vector3(i * 10, 1, 1))
self.add_child(collisionNode)