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Unreal Engine Physics Essentials by Devin Sherry, Katax Emperore

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Scalars and vectors

These are definitions to describe the motion of objects. Both are unique. In mathematics, scalars are defined as quantities that are described as a single numerical value, whereas vectors are defined as quantities that are described as a numerical value and direction. The examples of scalar quantities include length, area, volume, speed, mass, temperature, and power, whereas the examples of vector quantities include direction, velocity, force, acceleration, and displacement.

In Unreal Engine 4, the use of scalar and vector values is very common, especially in blueprints and materials. In the context of the material editor, scalar values are simply numerical values, whereas vectors are actually the colors of RGBA or red, green, ...

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