Unity Game Optimization - Third Edition

Scaling

We should try to keep all physics object scales in the world as close to (1,1,1) as we possibly can. By default, Unity assumes that we are trying to simulate gameplay equivalent to being on the surface of the Earth. The force of gravity at the surface of the Earth is 9.81 meters-per-second squared, and hence the default gravity value is set to -9.81 to match. One unit in Unity's world space is equivalent to 1 meter, and the negative sign means that it will pull the object downward. Our object sizes should reflect our effective world scale since scaling them too large will cause gravity to appear to move the objects much more slowly than we would expect. If all of our objects are scaled five times too big, then gravity will appear ...