Raycast crash

Questions
1

I bumped into a crash when using raycasts under certain conditions:

This code:

	local from = vmath.vector3(0, -13200000, 0)
	local to = from + vmath.vector3(0, -1, 0)
	local groups = {hash("test")}
	physics.raycast(from, to, groups)

Together with the game.project setting:

[physics]
scale = 0.01

Causes a crash with this message:

Assertion failed: (r.LengthSquared() > 0.0f), function RayCast, file b2DynamicTree.h, line 232.

Usually when a ray’s vector has 0 length, this warning is displayed instead:

WARNING:PHYSICS: Ray had 0 length when ray casting, ignoring request.

It could have something to do with floating point precision, because of the extreme numbers, coupled with a short ray.

The crash can be avoided, but it may be better to catch it and display the above message instead? I can add a Github issue for this if needed.

Defold 1.9.7. Minimal repro:
RaycastCrash.zip (3.6 KB)

2

Thanks. Please report on Github so we don’t forget about it.

1 Like
3

Done!

1 Like