koobas.hobune.stream
Massive lag moving platforms
The following code powers my moving platforms. However, if there are more than 3 or so, I start to experience massive lag. As in 3 FPS lag. This seems really excessive for what I'm doing. Ideas on streamlining this? Am I doing something that really chews memory?
EDIT: I have tracked the problem down to the lines of code that scale the piston. Is scaling every frame really slow or something?
var Top : GameObject;
var Piston : Transform;
var Sound : AudioSource;
var HeightToLift : float;
var Speed : float;
var usingButton : boolean;
var linkedButton : ButtonControl;
function FixedUpdate () {
if (Top.transform.localPosition.y > HeightToLift || Top.transform.localPosition.y < 0) { // Flip direction @ ends
Speed *= -1;
}
if (usingButton == true) {
if (linkedButton.buttonPressed) {
Top.rigidbody.MovePosition(Top.rigidbody.position+(transform.up * Time.deltaTime * Speed * 3));
Piston.localScale.z += Time.deltaTime * Speed; //THIS LINE
if (Sound.isPlaying == false) {
Sound.Play();
}
} else if (Sound.isPlaying == true) {
Sound.Stop();
}
} else {
Top.rigidbody.MovePosition(Top.rigidbody.position+(transform.up * Time.deltaTime * Speed * 3));
Piston.localScale.z += Time.deltaTime * Speed; // AND THIS LINE
if (Sound.isPlaying == false) {
Sound.Play();
}
}
}
Nothing shouts out in the code as problematic. What makes you think this code is responsible for the lag?
The only thing I can see is that you are using a rigidbody when It seems that a collider sans rigidbody would work fine for the purposes of the lift.
Also make sure that the piston and the Top can't collide with each other. I once doubled my framerate by changing a few collision flags along those lines.
@Graham: See my edit above
@SilverTabby: Tried that. It helped some, but I'm still running around 10 FPS. I use a rigidbody as I found the physics were more realistic with the rigidbody. (Platform pushing stuff through walls, etc.)
Are the rigidbodies kinematic? $$anonymous$$inematic rigidbodies are more adequated for moving parts not subject to physics (see http://unity3d.com/support/documentation/Components/comp-DynamicsGroup.html). You could also try to remove the rigidbodies just to check how much it influences the FPS.
Do you by error use a mesh collider? If so ensure its selected to be convex, you must never move mesh colliders that are not convex as the whole collision tree gets constantly updated and thats an extremely cpu intense work, if you get close to detailed meshes or the terrain it can even become a neck breaking bottleneck.
If a single collider can't represent a more complex shape that would not be able to work with convex mesh collider, use subobjects that only have a collider on them (normally primitive) and try to represent it that way. or rework the model to visually represent what you physically need for it to have it working reasonably.
I'd actually switched to a box collider shortly before you posted this, but thanks for the explanation on the problem. I'll file this for future reference. Thanks!
