Optimization of a scene with physical objects

11116 · May 14, 2020, 7:13am

I have about 1000 physical objects on stage, which greatly affects computer performance. It is necessary to optimize. I decided to divide the scene into chunks with physical objects. That is, immediately the objects will not be physical at all, they will be ordinary. If a player enters the chunk, I turn on physics objects. Can I make sure that those objects that don’t fall into the camera’s view freeze? That is, if the physical body fell - it will stop and freeze in the air

Cedric · May 14, 2020, 9:14am

With ammojs, you can set threshold values for sleeping state:

github.com

kripken/ammo.js/blob/master/ammo.idl#L557


  attribute float m_additionalLinearDampingThresholdSqr;
  attribute float m_additionalAngularDampingThresholdSqr;
  attribute float m_additionalAngularDampingFactor;
};

interface btRigidBody {
  void btRigidBody([Const, Ref] btRigidBodyConstructionInfo constructionInfo);

  [Const, Ref] btTransform getCenterOfMassTransform();
  void setCenterOfMassTransform([Const, Ref] btTransform xform);
  void setSleepingThresholds(float linear, float angular);
  [Const] float getLinearDamping();
  [Const] float getAngularDamping();
  void setDamping(float lin_damping, float ang_damping);
  void setMassProps(float mass, [Const, Ref] btVector3 inertia);
  [Const, Ref] btVector3 getLinearFactor();
  void setLinearFactor([Const, Ref] btVector3 linearFactor);
  void applyTorque([Const, Ref] btVector3 torque);
  void applyLocalTorque([Const, Ref] btVector3 torque);
  void applyForce([Const, Ref] btVector3 force, [Const, Ref] btVector3 rel_pos);
  void applyCentralForce([Const, Ref] btVector3 force);

If the body linear or angular value is below a threshold, it will be in sleep mode. It will not move until a new contact or an impulse.
So, I would try to set that value so newly created physics objects are in sleeping mode. When you leave the chunk and you want to remove the chunk’s physics objects, check that there are not moving. When an object is not moving anymore, if it’s not in the current chunk, then you can remove it.

11116 · May 14, 2020, 5:02pm

Can you tell me how I can verify that the object is within the camera’s visibility?

Cedric · May 14, 2020, 5:05pm

Sure! you can try with this method : Camera - Babylon.js Documentation

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Optimization of a scene with physical objects

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