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How would I get a relative point between a min and max value that could be represented as a float between 0.0 and 1.0? (lemmy.world)

submitted 1 year ago by [email protected] to c/godot

15 comments fedilink hide all child comments

I have a min and max position of an object and I want to represent an arbitrary point between them as a float between 0.0 and 1.0. This feels relatively basic math, but I can't quite figure out what I need to do with this. Is there a special name for this sort of thing? Also, are there any built-in methods that would be useful for this?

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[–] o11c 2 points 1 year ago (3 children)

Related, note that division is much slower than multiplication.

Instead of:

n / d

see if you can refactor it to:

n * (1.0/d)

where that inverse can then be hoisted out of loops.

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago)

Just to clarify, the value in parentheses must be precalculated.

For example, instead of:

n / 2

Do:

n * 0.5

[–] [email protected] 2 points 1 year ago (1 children)

This is something for compiler writers to worry about.

[–] o11c 1 points 1 year ago

Compilers are generally forbidden from optimizing floating-point arithmetic, since it can change precision.

[–] [email protected] 1 points 1 year ago

If multiplication vs division is causing perf issues you fucked up somewhere or shouldn't be asking on Lemmy for help because your performance critical system is of the safety and health type.

I've never had division actually be a real issue.

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