Does Unity precomputes physics and render it or render per FixedUpdate()?

[ikelaiah]

I thought I read it in Unity docs, but I simply couldn’t find it. If there are 2 rigid bodies interacting in the scene, does Unity calculate physics of both bodies then render it, or do the physics and rendering happens at the same time?

Render and Physics calculation at same time seem dubious.
-ikel

[Eric5h5]

Are you talking about rendering meshes? That’s separate from physics.

–Eric

[ikelaiah]

Yes, rendering meshes.

[ikelaiah]

Found the answer! It is here

Here’s how the fixed time step is calculated. Before every frame is drawn onscreen, Unity advances the fixed time by fixed delta time and performs physics calculations until it reaches the current time. This directly correlates to the Fixed Timestep property. The smaller the value of Fixed Timestep, the more frequently physics will be calculated. The number of Fixed frames per second can be calculated by dividing 1 by Fixed Timestep. Therefore, 1 / 0.02 = 50 fixed frames per second and 1 / 0.05 = 20 fixed frames per second.