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Le 27/07/2015 20:10, Le_Forgeron a écrit :
> Le 26/07/2015 18:30, Cousin Ricky a écrit :
>> On 07/25/2015 10:25 AM, Cousin Ricky wrote:
>>> The following paraboloid renders correctly:
>>>
>>> [snip]
>>>
>>> the object disappears completely in POV-Ray 3.7 and 3.7.1. In
>>> POV-Ray 3.6.1, it renders as expected.
>>>
>>> POV-Ray 3.7.0.unofficial POV-Ray 3.7.1-alpha.8150025.unofficial
>>> openSUSE 13.2 GNU/Linux
>
>
> Confirmed on Ubuntu 15.04 too.
>
Looking at the bounding box, with -0.999*y :
Min : -10000000000.0000,-10000000000.0000,-10000000000.0000
Max : 10000000000.0000,10000000000.0000,10000000000.0000
whereas with -y :
Min : 1.2500,0.0000,0.0000
Max : 1.2500,0.0000,0.0000
Compared to 3.6.1 with -y :
Min : 0.2500,0.0000,-1.0000
Max : 2.2500,2.0000,1.0000
and 3.6.1 with -y*0.999 :
Min : 0.2500,0.0010,-1.0000
Max : 2.2500,2.0000,1.0000
Raw conclusion so far: the bounding box computation in 3.7 get
something wrong. It might be in intersection/csg or cylinder. (as
quadric is kind of infinite, it is unlikely to be involved... but a
look does not cost that much either).
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