[x3d-public] Using c# with graphics

[Konstantin Smirnov]

When we use Visual Studio, can we get some tips for this, must we write
some special tricks for Double?
Decimal is better?

вт, 21 сент. 2021 г., 17:36 Konstantin Smirnov <
konstantin.e.smirnov at gmail.com>:

> By the way, can we get guaranteed accuracy of math computations, also
> sums, division get 16 digit true?
>
> вт, 21 сент. 2021 г., 16:45 Konstantin Smirnov <
> konstantin.e.smirnov at gmail.com>:
>
>> Now taking part in a contest, want to understand, is this simple?
>> Most examples sum numbers simply
>>
>> вт, 21 сент. 2021 г., 16:39 Konstantin Smirnov <
>> konstantin.e.smirnov at gmail.com>:
>>
>>> It seems to me that we must not do additional operations on each calc
>>> Examples don't have this
>>>
>>> вт, 21 сент. 2021 г., 13:39 vmarchetti at kshell.com <vmarchetti at kshell.com
>>> >:
>>>
>>>> This reference:
>>>> https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/floating-point-numeric-types
>>>> details that in the Microsoft .NET C# environment, the numeric double
>>>> type is an 8-byte representation, and offers about 16 digits of precision.
>>>>
>>>> In my experience, in those specific cases where numeric precision needs
>>>> to be carefully dealt with, the solution is not to round the results of a
>>>> calculation; rather the solution is to look at where two double values are
>>>> being compared for equality, and replacing the comparison
>>>>
>>>> if ( a==b) { .... }
>>>>
>>>> with
>>>> if ( abs(a-b) < tolerance ) { ... }
>>>>
>>>> and choosing a value of tolerance is can be something like
>>>>
>>>> double tolerance = 1.0e-15 * Math.Max( abs(a), abs(b))
>>>>
>>>> Vince Marchetti
>>>>
>>>>
>>>> On Sep 21, 2021, at 1:04 AM, Konstantin Smirnov <
>>>> konstantin.e.smirnov at gmail.com> wrote:
>>>>
>>>> Hi
>>>> When adding double numbers in .cs script, must we think about every
>>>> digit accuracy, or it's approximate numbers, so we can treat them as
>>>> approximate with e-7, or so? 15?
>>>>
>>>> Can we do calc and round afterwards?
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>>>>
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