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[3.x] Improve the docs for the float type

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(cherry picked from commit 02a94ee977)
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Aaron Franke 2021-08-18 13:20:41 -05:00 committed by Rémi Verschelde
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doc/classes/float.xml
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@ -4,9 +4,13 @@
Float built-in type.
</brief_description>
<description>
Float built-in type.
The [float] built-in type is a 64-bit double-precision floating-point number, equivalent to [code]double[/code] in C++. This type has 14 reliable decimal digits of precision. The [float] type can be stored in [Variant], which is the generic type used by the engine. The maximum value of [float] is approximately [code]1.79769e308[/code], and the minimum is approximately [code]-1.79769e308[/code].
Most methods and properties in the engine use 32-bit single-precision floating-point numbers instead, equivalent to [code]float[/code] in C++, which have 6 reliable decimal digits of precision. For data structures such as [Vector2] and [Vector3], Godot uses 32-bit floating-point numbers.
Math done using the [float] type is not guaranteed to be exact or deterministic, and will often result in small errors. You should usually use the [method @GDScript.is_equal_approx] and [method @GDScript.is_zero_approx] methods instead of [code]==[/code] to compare [float] values for equality.
</description>
<tutorials>
<link title="Wikipedia: Double-precision floating-point format">https://en.wikipedia.org/wiki/Double-precision_floating-point_format</link>
<link title="Wikipedia: Single-precision floating-point format">https://en.wikipedia.org/wiki/Single-precision_floating-point_format</link>
</tutorials>
<methods>
<method name="float">