POV-Ray : Newsgroups : povray.bugreports : bounding boxes again Server Time
31 Oct 2024 19:41:41 EDT (-0400)
  bounding boxes again (Message 1 to 7 of 7)  
From: Martin
Subject: bounding boxes again
Date: 10 Jan 2010 07:30:55
Message: <4b49c87f$1@news.povray.org>
Hello!

transform is not transforming the bounding boxes in this release (beta 
35). I think this happened already in beta 32 (if i remember). Again, 
this code renders ok in pov 3.6:

global_settings{#if(version < 3.7) assumed_gamma 1 #end}
camera{location x*10+z*5+y*5 look_at 0}
light_source{(x+y)*10 1}

background{rgb <0.5,0.6,0.7>}

#declare T1= transform{translate x}

#declare Ob1= intersection{
   sphere{0 10 translate -z*9.5}
   sphere{0 10 translate z*9.5}
   cylinder{z*2,-z*2 1 inverse}
   pigment{red 1}
   bounded_by{box{2.6, -2.6}}
   transform{ T1}
}
#declare Ob2= intersection{
   sphere{0 10 translate -x*9.5}
   sphere{0 10 translate x*9.5}
   cylinder{x*2,-x*2 1 inverse}
   pigment{green 1}
   bounded_by{box{2.6, -2.6}}
   transform{ T1}
}
union{
   object{Ob1} //<----- :?.. where is my bounding box!
   object{Ob2}
transform{T1}
}

Thank you!


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From: Le Forgeron
Subject: Re: bounding boxes again
Date: 12 Jan 2010 04:47:36
Message: <4b4c4538@news.povray.org>
Martin a écrit :
> Hello!
> 
> transform is not transforming the bounding boxes in this release (beta
> 35). I think this happened already in beta 32 (if i remember). Again,
> this code renders ok in pov 3.6:

Manual bounding is not clipping.

From my historical knowledge: windows-pov got a default +MB3 whereas
unix sticked to +MB25
Maybe the 3.7 get a uniform value for all ?
With so few objects, bounding would be turned off, which might explains
your issue.

Whatever, if you want to clip, use clipping_by.

-- 
A: Because it messes up the order in which people normally read text.<br/>
Q: Why is it such a bad thing?<br/>
A: Top-posting.<br/>
Q: What is the most annoying thing on usenet and in e-mail?


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From: Warp
Subject: Re: bounding boxes again
Date: 12 Jan 2010 13:42:01
Message: <4b4cc279@news.povray.org>
Le_Forgeron <lef### [at] freefr> wrote:
> Whatever, if you want to clip, use clipping_by.

  clipped_by is another possibility. It's slightly better in that it doesn't
give any parsing error.

-- 
                                                          - Warp


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From: Martin
Subject: Re: bounding boxes again
Date: 14 Jan 2010 05:57:58
Message: <4b4ef8b6$1@news.povray.org>
Le_Forgeron escribió:
> 
> Manual bounding is not clipping.
> 
> From my historical knowledge: windows-pov got a default +MB3 whereas
> unix sticked to +MB25
> Maybe the 3.7 get a uniform value for all ?
> With so few objects, bounding would be turned off, which might explains
> your issue.
> 
> Whatever, if you want to clip, use clipping_by.
> 

What is it that makes you think that i want to clip? I want to bound. 
The objects should look as two lenticular shapes. Is just a test.

I have more complex objects prperly bounded_by, to speed render, that 
rendered ok with beta 34, and now don't render as they should, and the 
objects are exactly the same.

+MB25 gives the same (wrong) results in this beta.

Thank You


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From: Le Forgeron
Subject: Re: bounding boxes again
Date: 14 Jan 2010 17:10:43
Message: <4b4f9663$1@news.povray.org>
Le 14/01/2010 11:58, Martin nous fit lire :
> 
> What is it that makes you think that i want to clip? I want to bound.
> The objects should look as two lenticular shapes. Is just a test.

But that bounding is:
 1. Manual (and probably not needed)
 2. far too big at least in one direction
 3. wrong: some part of the intersection are outside the box (check it
with clipped_by or adding the box in the intersection)

Garbage in, Garbage out.
Hence my suggestion to clipped_by.


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From: Martin
Subject: Re: bounding boxes again
Date: 15 Jan 2010 05:09:49
Message: <4b503eed$1@news.povray.org>
Le_Forgeron escribió:
> Le 14/01/2010 11:58, Martin nous fit lire :
>> What is it that makes you think that i want to clip? I want to bound.
>> The objects should look as two lenticular shapes. Is just a test.
> 
> But that bounding is:
>  1. Manual (and probably not needed)
>  2. far too big at least in one direction
>  3. wrong: some part of the intersection are outside the box (check it
> with clipped_by or adding the box in the intersection)
> 
> Garbage in, Garbage out.
> Hence my suggestion to clipped_by.

All right, sorry. At first sight it seemed to me the same problem, so I 
was using a test 2 years old, thinking it was well bounded :).

Now I try to see what happens, and seems like the cone is inverted.


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From: Martin
Subject: Re: bounding boxes again
Date: 15 Jan 2010 06:08:08
Message: <4b504c98$1@news.povray.org>
I installed beta 35 just five days ago, and i've seen the new one right 
now. Problem solved.

Thanks to you and all the Pov-team for doing pov-ray.


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