Child object physic bug

[YouGroove]

In the scene i have one empty model composed of two child physic objects, than i put a mass to 1 for each child objects.

 

Launching the game, the two objects just fly away instead of simply falling on ground.

 

 

 

How to test :

- Dezip file

- put map file in your "map" file directory

- put columnTest.zip in your "models" directory and dezip it here

- run the game

bug.zip

[Josh]

Okay, so those two visible children have mass, but they don't have a collision shape, so they just sink right through the floor.

 

When I set the parent's mass to non-zero and set the children's mass to zero, it works fine.

col2.rar

[YouGroove]

In fact i thaught we could have a mass = 1 for each child , but when i do that each childs fly aways in any direction, i expected we could the two childs to fall on floor independently because each have a mass and a collision (even by at each child a simple collision box in LE3 ).

Some application could have been columns or walls braking in many parts, it would be a prefab made of multiple childs, during game you would reaplace a column by some instance prefab of a column broken in multiple childs.

 

Edit :

To clarify : In your example map, it falls on floor but as one object only because a mass is given to the parent object, not as two individual physic pieces

[Josh]

When I ran it they just fall into and through the floor. They don't fly away from each other.

 

Normally when you do breakage type stuff, you swap out the unbroken model for some fragments.

[YouGroove]

Normally when you do breakage type stuff, you swap out the unbroken model for some fragments.

I tried , the only way to have physics working well was a very approximative way using script :

http://www.leadwerks.com/werkspace/page/tutorials/_/artwork/destroyable-physics-r112

 

Take a wall for example, when remplacing it by the broken wall composed of ten pieces, we would need to be able to import some FBX file containing all ten pieces each with a collision volume , and in LE3 we would assign a mass to each piece, and placing that model anywhere running LE3, all pieces would fall and behave individually based on physics.

 

The goal was to import in LE3 some FBX file contaning many child objects each behaving good with physics when instanced during game.

 

---------------------------------

 

A bug remains , as i put basic collision sphere for the upper child piece, it collides with the base but seems to go throught floor or disappear (it is because each piece is parented to same empty parent object) ?

 

I provided a test map :

- Dezip, place map file on your map directory

- place column.mdl in your model directory directly

- run the game

test.zip