Problems with the shape (SOLVED)

darriagada · January 29, 2019, 1:20pm

hi im trying to collide 2 object but i have this message error.

Assertion failed: area > 1.192092896e-07F, file …\src\box2d\Box2D\Collision\Shapes\b2PolygonShape.cpp, line 115

Johan_Beck-Noren · January 29, 2019, 1:33pm

Here is the offending line:

mcxiaoke/box2d-ndk/blob/e8a2124d20d1181e27a96b574dca74d8b88e34af/jni/Box2D/Collision/Shapes/b2PolygonShape.cpp#L115


		float32 D = b2Cross(e1, e2);


		float32 triangleArea = 0.5f * D;
		area += triangleArea;


		// Area weighted centroid
		c += triangleArea * inv3 * (p1 + p2 + p3);
	}


	// Centroid
	b2Assert(area > b2_epsilon);
	c *= 1.0f / area;
	return c;
}


void b2PolygonShape::Set(const b2Vec2* vertices, int32 count)
{
	b2Assert(3 <= count && count <= b2_maxPolygonVertices);
	m_vertexCount = count;


	// Copy vertices.

Can you check that the collision shape dimension values are sane?

darriagada · January 29, 2019, 1:36pm

where i see that? the dimensions of the collisionobject?

Johan_Beck-Noren · January 29, 2019, 1:37pm

Box:

Sphere/circle:

darriagada · January 29, 2019, 1:42pm

Mathias_Westerdahl · January 29, 2019, 1:52pm

What’s the scale of the game object when you spawn this object?

darriagada · January 29, 2019, 1:53pm

its 1.5

Mathias_Westerdahl · January 29, 2019, 1:54pm

Also, I believe the physics.scale is relevant. What value does that have in your game.project?

darriagada · January 29, 2019, 1:57pm

in game.project the scale is 1.0

Mathias_Westerdahl · January 29, 2019, 2:04pm

Then it’s weird, since that area should be 135.
I’d double check in the scripts first, that nothing accidentally sets the scale to something extremely small.
Double check the dimensions of the other objects too.

darriagada · January 29, 2019, 2:07pm

the dimensions of the other objects is 250 x 20, and when i delete the bullet collision the game works well D:, the dimensions of the image is 16x16 pixels

edit: nevermind i don’t know why the box shape it gave me error, but i change the shape for sphere and works well, thanks for the help