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February 26th, 2014, 01:04 PM   #1
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Calculating angle sin and sin angle without any functions.

I discovered that calling functions in c++ is a really slow process.
By doing everything inside of my function, it will be like 60% faster.

Is there possible to calculate angle sin and sin angle ( reverse the sin ) without any functions?
For example
sin angle 90 = 0. something
0.something = 90

Also, I need cos, square root, atan2
I have no idea what is atan2 but here is what it does

y and x are coordinates
angleyaw = (atan2(y, x) * 180.0 / PI);
Basically it takes x and y and does things with them.
It gets angle between 2 coordinates ( 2 vector )
I would be very grateful if someone can help me with that.
Thank you!
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February 26th, 2014, 04:57 PM   #2
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You can hold the answers in a table, the computer equivalent of the printed tables people used before computers were available. This won't be quite as accurate as the library functions, but it will be extremely fast.
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