Forces in Unity: The Basics

Abstract for the post

Introduction

A rigid-body is a solid element whose dynamics are estimated with respect to certain center of mass (a point) that represents the body. To move rigid-bodies in Unity (or many other game-engines using a physical simulator to move objects around), you can do it in different ways:

1. By defining the position of the object directly.
2. By defining the velocity vector (first derivate of the position).
3. By defining the acceleration vector (second derivative of the position).

However, the first two methods to move a rigid-body in a simulator have some (big)

p_1 = a * dt * dt / 2 + v * dt + p_0
				
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A rigid-body is a solid element whose dynamics are estimated with respect to certain center of mass (a point) that represents the body. To move rigid-bodies in Unity (or many other game-engines using a physical simulator to move objects around), you can do it in different ways:

Conclusion

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