[Bf-committers] Re: Re: [Bf-blender-cvs] CVS commit:blender/source/blender/python/api2_2x Mathutils.c

Gilbert, Joseph jgilbert at tigr.ORG
Mon Oct 10 22:07:41 CEST 2005

Yep. I remember we went with saacos before and it gave bad precision
(which was a previous bug fix) because of what theeth is saying - python
floats are really doubles. I'm just going to add a test so values are
not always clamped. :)

-----Original Message-----
From: bf-committers-bounces at projects.blender.org
[mailto:bf-committers-bounces at projects.blender.org] On Behalf Of Martin
Sent: Monday, October 10, 2005 3:51 PM
To: bf-blender developers
Subject: Re: [Bf-committers] Re: Re: [Bf-blender-cvs] CVS
commit:blender/source/blender/python/api2_2x Mathutils.c

--- Brecht Van Lommel <brechtvanlommel at pandora.be>

> Exactly. There is a saacos ('safe acos') function in
> BLI_arithb.h just for this,
> and it's used all over the sources. acos should
> never be called directly.
> Brecht.

The "problem" is that saacos returns a single
precision float whereass python uses double precision
floats, so using acos directly has added precision
(even though the vector's data is in single


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