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Question by Erisat · May 18, 2014 at 05:22 PM · vector3floatprecisionoriginfloatingpoint

maximum distance from origin (float precision)

Ok, so players can travel up to about ~12km from origin in many directions. I believe I would need CM accuracy (player is about 1.5m in height) to produce desirable effects. My research on floating points has led me to believe that floats have ~7.2 decimal places of precision. 12,000.01 has seven digits, and would have cm accuracy, is this assumption correct? I have seen people claim that float precision has been the cause of issues in multiple cases, some claiming around 20km, others around 40km, and I saw one guy post a quote from unity reference saying something along the lines of 99km should be fine, but a warning will generate and issues arise past that. I have not seen this in the reference myself, he did not post a link.

Could someone clarify this for me? is my world too big to have players moving accurately at such distances? If not, could i push it to 20km safely? That is the biggest I could imagine ever using. I want to know the limits before I wing it with trial and error.

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getyour411
AndreiMarian

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avatar image Jeff-Kesselman · May 18, 2014 at 05:28 PM 0
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World coordinate size is relative. You can assign any scale you like to your coordinates.

But if you are expecting to have a continuos scene big enough that you cannot fit it all into an appropriate range of a float when properly scaled, I would reconsider your plans as its not likely to fit in memory or otherwise scale to that sort of size, anyway.

avatar image AndreiMarian · Jan 06, 2021 at 12:52 AM 0
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Google keeps popping this when searching "unity floating point range limit" or alike. Hence the necro. So eventually, what is the minimum reliable range? According to comments in youtube.com/watch?v=G5UTyC6IpSI it can get as low as 3000 units (shadows). The inspector warns at 1000000. Can we have a definitive response? Some actual value we can count on? Also see this post in the forums.

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Answer by Elric · Jun 09, 2015 at 06:29 AM

Great explanation can be found here

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KarlGG
FlightOfOne

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