public PhysicsCollisionGroups(PhysicsLayersDescription layers)
{
_layers = layers;
int layerCount = layers.GetLayerCount();
_collisionGroupsByLayer = new CollisionGroup[layerCount];
for (int i = 0; i < layerCount; i++)
{
_collisionGroupsByLayer[i] = new CollisionGroup();
}
for (int i = 0; i < layerCount; i++)
{
CollisionGroup group = _collisionGroupsByLayer[i];
for (int g = i + 1; g < layerCount; g++)
{
bool collides = layers.GetDoLayersCollide(i, g);
if (!collides)
{
CollisionRules.CollisionGroupRules.Add(new CollisionGroupPair(group, _collisionGroupsByLayer[g]), CollisionRule.NoBroadPhase);
}
}
}
}
public int GetLayerCount() => _layers.GetLayerCount();