koobas.hobune.stream
Cheap gravity script
hi,
I understand that Unity's Gravity calculation for Rigidbodies is quite expensive for mobiles devices. I was wondering if there is a work-around to this, possibly a script simulating the same effect / acceleration?
var velocity: Vector3 = Vector3(5, 5, 0);
var gravity: float = 9.8;
function Update(){
// apply gravity
velocity.y -= gravity * Time.deltaTime;
// calculate new position
transform.position += velocity * Time.deltaTime;
}
Calculating gravity effects is the cheapest part - the big problem comes from collision detection and reaction to collisions, other tasks that the management of a rigidbody requires.
If you want to simulate gravity in a simple object, just calculate its movement frame by frame:
var velocity: Vector3 = Vector3(5, 5, 0); var gravity: float = 9.8;
function Update(){ velocity.y -= gravity Time.deltaTime; // apply gravity transform.position += velocity Time.deltaTime; // calculate new position } This simple code will make the object to which it's attached to describe a ballistic trajectory. Collisions aren't detected, but maybe a good compromise could be achieved by adding a kinematic rigidbody to the object and setting its collider to trigger, then using OnTriggerEnter to detect collisions.
