MP
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Fixed Timestep
Unlike the main frame update, Unity’s physics system does work to a fixed timestep
A customizable framerate-independent interval that dictates when physics calculations and FixedUpdate() events are performed. More info
See in Glossary
, which is important for the accuracy and consistency of the simulation. At the start of the physics update, Unity sets an “alarm” by adding the fixed timestep value onto the time when the last physics update ended. The physics system will then perform calculations until the alarm goes off.
You can change the size of the fixed timestep from the Time window and you can read it from a script using the Time.fixedDeltaTime property. Note that a lower value for the timestep will result in more frequent physics updates and more precise simulation but at the cost of greater CPU load. You probably won’t need to change the default fixed timestep unless you are placing high demands on the physics engine
A system that simulates aspects of physical systems so that objects can accelerate correctly and be affected by collisions, gravity and other forces. More info
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