Avoid possible divide by zero in scene.

[alesliehughes]

Both of these functions are used in a divide, so returning 0 will just cause a crash.

[lawnjelly]

I would fix these at the call sites, code not checking for divide by zero is unsafe code.

We have also previously talked about enforcing this by having process etc return 0 during startup / CI checks, which sounds a better approach.

[KoBeWi]

Isn't result of float division by zero an infinity instead of crash?

[alesliehughes]

Isn't result of float division by zero an infinity instead of crash?

You are correct. Though once it has this value, any calculation will be infinity as well.