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Question by Michellia · May 06, 2014 at 03:02 PM · scalingchanges

In Code Changing Rotation; Chances the scaling to 0.999999

When in code we change the rotation of the camera to x=30, y=45 and z=0 isometric camera it changes the scale to X = 0.9999999 y = 0.9999999 and z stays at 1.

Why does this happen?

How do we fix it?

Does it matter: will it screw up the graphics or anything else?

Seems to us to introduce artifacts!

thanks all,

Tried finding post with 0.9999999 but only found one and it was his own graphics messing it up.

thanks again....

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avatar image Michellia · May 06, 2014 at 05:25 PM 0
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Why is it when we set it to 1.0f, it rounds to0.99999999.

Why is there rounding?

thanks

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Answer by Landern · May 06, 2014 at 03:06 PM

Floating-point precision issues, you will find this with most any engine or anything that uses floating point, they are typically not 100% accurate.

wikipedia float point article.

You will find in the first sentence, "approximation".

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avatar image Jeff-Kesselman · May 06, 2014 at 03:14 PM 0
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As Ländern says, this is round off error. Its really no different then 1.0, just ignore it.

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Answer by Dracorat · May 06, 2014 at 05:26 PM

Here is a pretty nice explanation of this:

http://stackoverflow.com/questions/2100490/floating-point-inaccuracy-examples

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