Strange physics error when creating rectangle with 0 height

[BlackBulletIV]

I'm getting a strange physics error when I create a rectangle with a height of 0. This is the code:

Code: Select all

function Entity:setRectangleShape(x, y, angle)
    self.shape = love.physics.newRectangleShape(self.body, x or 0, y or 0, self.width, self.height, angle or 0)
end

I call the function with no parameters passed in, and the entity's width set to a certain value greater than 0 and the height to 0. This causes love.app to display a window with nothing but gray, freeze for a bit and then quit. This message is displayed in the terminal:

Code: Select all

2011-01-09 15:37:02.110 love[3047:903] Can't open input server /Library/InputManagers/Inquisitor
Assertion failed: (edge.LengthSquared() > 1.19209290e-7F * 1.19209290e-7F), function b2PolygonShape, file /Users/bill/love/platform/macosx/../../src/modules/physics/box2d/Source/Collision/Shapes/b2PolygonShape.cpp, line 161.
Abort trap

Please note, the "Can't open input server" appears all the time, so it's nothing to worry about I assume. Anyway, it me a while to work out I was making a rectangle with a height of 0, and when I changed the height the problem was fixed.

[Robin]

There's nothing strange about that. You're trying to create a rectangle with a height of 0. That's not a rectangle, it's a True Line™. Box2D doesn't do that, since it doesn't make sense to simulate lines.

You can use a very thin rectangle — 3 pixels was the minimum, IIRC. Unless you use setMeter, but then the rest of the world should be adjusted too.

[BlackBulletIV]

I understand that. What I was posting about is the weird Love handled the error. Love doesn't normally freeze, show a grey screen and then spit out an error message to the console telling me that some assertion failed in a Box2D file ( which by the way has another username, my username is michael).

[Robin]

I understand that. What I was posting about is the weird Love handled the error. Love doesn't normally freeze, show a grey screen and then spit out an error message to the console telling me that some assertion failed in a Box2D file

That's just how Box2D asserts work, unfortunately. There has been some fixing, I don't know how far they are.

( which by the way has another username, my username is michael).

bill == anjo, the mac guy.

[BlackBulletIV]

That's just how Box2D asserts work, unfortunately. There has been some fixing, I don't know how far they are.

Well I guess Box2D was programming with C++ in mind. That would be fine when running C++ programs from the console; but unfortunately it means the error doesn't get to Lua.

bill == anjo, the mac guy.

Ah ok.

[bmelts]

That's, uh, really weird that it popped my name up. I'm guessing I did something dumb like not strip the binary properly or... something. Beats me

[BlackBulletIV]

That's what I thought.

EDIT: Yay! Citizen rank.