Introduction To Section 3

Section 3 Assets

• Section Assets Pack
• Previous section project, for Magnus Effect

Section Notes

Unstable Rotation In Unity 5

• The limitations of spinning objects in Unity 5.
• Why unstable rotation doesn't evolve.
• How to model unstable rotation in game physics.

Introducing Inertia Tensors

• Roughly what is an inertia tensor (I)?
• Unstable intermediate axis
• How Unity Calculates I
• Calculate I for your phone
• Predict it's unstable axis

Calculating Moment Of Inertia

• How about if two axis are equal?
• Try it with a spinning cylinder.
• Calculate the moment of inertia.
• Render vs. collider mesh influence.

Parallel Axis Theorem

• NOT the same as Intermediate Axis Theorem.
• How to calculate I for compound objects.
• Think of a discus thrower.
• Parallel Axis Theorem - Wikipedia,the free encyclopedia

“Newton’s Laws Of Rotation”

• A recap of Newton's laws of motion.
• How these relation to rotation.
• Important differences.
• Why we're jumping in the deep end!

Applying Torque To Rigidbodies

• How to use Unity's AddTorque() method.
• How Inertia Tensor affects rotation.
• Comparing the rotation of two objects.

Vector Cross Products

• What a cross product is.
• Why they are so useful.
• Using WolframAlpha to calculate.

The Magnus Effect

• What the Magnus Effect is.
• How we can approximate ball flight with it.
• Using Vector3.Cross in Unity.

Section 3 Wrap-Up