Modern Math DistanceSquared

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DistanceSquared

Returns the squared distance between two points, the cheap way to test a range.

Syntax

DistanceSquared( byref a as Vec3, byref b as Vec3 ) as float32

Notes

• Exact, and the correct primitive for a range check -- compare it against the square of the radius rather than taking a root.
• LengthSquared( b - a ).

Examples

#import "std/numeric"
using numeric

dim as Vec3 a = type<Vec3>( 1, 2, 3 ), b = type<Vec3>( 4, 5, 6 )

print DistanceSquared( a, b )                 '' 27

'' The comparison a range check actually wants
dim as float32 r = 6
print DistanceSquared( a, b ) <= r * r        '' -1 (true)

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Library: Math Library
Category: Math Library
Documented under: Members