POV-Ray: Newsgroups: povray.general: Materials before or after bounded

POV-Ray : Newsgroups : povray.general : Materials before or after bounded_by?		Server Time 23 Dec 2024 12:28:04 EST (-0500)

From: Mike Horvath
Subject: Materials before or after bounded_by?
Date: 29 Jan 2016 04:20:12
Message: <56ab2ecc@news.povray.org>

Should the bounded_by statement be the very last statement in a CSG 
block? Or is it okay to have textures/materials/etc. come after?


Mike

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From: Mike Horvath
Subject: Re: Materials before or after bounded_by?
Date: 29 Jan 2016 04:30:52
Message: <56ab314c$1@news.povray.org>

On 1/29/2016 4:20 AM, Mike Horvath wrote:
> Should the bounded_by statement be the very last statement in a CSG
> block? Or is it okay to have textures/materials/etc. come after?
>
>
> Mike

Also, is there any benefit to using bounded_by in the following case?


difference
{
	object {MyObject1}
	object {MyObject2}
	bounded_by {MyObject1}
}

intersection
{
	object {MyObject1}
	object {MyObject2}
	bounded_by {MyObject1}
}

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From: clipka
Subject: Re: Materials before or after bounded_by?
Date: 29 Jan 2016 05:15:44
Message: <56ab3bd0$1@news.povray.org>

Am 29.01.2016 um 10:31 schrieb Mike Horvath:
> On 1/29/2016 4:20 AM, Mike Horvath wrote:
>> Should the bounded_by statement be the very last statement in a CSG
>> block? Or is it okay to have textures/materials/etc. come after?

It's totally irrelevant.

> Also, is there any benefit to using bounded_by in the following case?
> 
> difference
> {
>     object {MyObject1}
>     object {MyObject2}
>     bounded_by {MyObject1}
> }
> 
> intersection
> {
>     object {MyObject1}
>     object {MyObject2}
>     bounded_by {MyObject1}
> }

That depends.

If MyObject1 is significantly easier to compute than MyObject2, then it
may indeed speed up rendering.

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From: Mike Horvath
Subject: Re: Materials before or after bounded_by?
Date: 29 Jan 2016 05:49:37
Message: <56ab43c1$1@news.povray.org>

On 1/29/2016 5:15 AM, clipka wrote:
> Am 29.01.2016 um 10:31 schrieb Mike Horvath:
>> On 1/29/2016 4:20 AM, Mike Horvath wrote:
>>> Should the bounded_by statement be the very last statement in a CSG
>>> block? Or is it okay to have textures/materials/etc. come after?
>
> It's totally irrelevant.
>
>> Also, is there any benefit to using bounded_by in the following case?
>>
>> difference
>> {
>>      object {MyObject1}
>>      object {MyObject2}
>>      bounded_by {MyObject1}
>> }
>>
>> intersection
>> {
>>      object {MyObject1}
>>      object {MyObject2}
>>      bounded_by {MyObject1}
>> }
>
> That depends.
>
> If MyObject1 is significantly easier to compute than MyObject2, then it
> may indeed speed up rendering.
>

What if they both happen to be spheres or cylinders? I.e. similar types 
of objects.


Mike

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From: clipka
Subject: Re: Materials before or after bounded_by?
Date: 29 Jan 2016 11:24:14
Message: <56ab922e$1@news.povray.org>

Am 29.01.2016 um 11:49 schrieb Mike Horvath:
> On 1/29/2016 5:15 AM, clipka wrote:
>> Am 29.01.2016 um 10:31 schrieb Mike Horvath:
>>> On 1/29/2016 4:20 AM, Mike Horvath wrote:
>>>> Should the bounded_by statement be the very last statement in a CSG
>>>> block? Or is it okay to have textures/materials/etc. come after?
>>
>> It's totally irrelevant.
>>
>>> Also, is there any benefit to using bounded_by in the following case?
>>>
>>> difference
>>> {
>>>      object {MyObject1}
>>>      object {MyObject2}
>>>      bounded_by {MyObject1}
>>> }
>>>
>>> intersection
>>> {
>>>      object {MyObject1}
>>>      object {MyObject2}
>>>      bounded_by {MyObject1}
>>> }
>>
>> That depends.
>>
>> If MyObject1 is significantly easier to compute than MyObject2, then it
>> may indeed speed up rendering.
> 
> What if they both happen to be spheres or cylinders? I.e. similar types
> of objects.

In that case it would be useless at best, and may actually slow down
render times.

To the best of my knowledge, that is. I still haven't spent enough time
studying the bounding mechanism to understand every detail of it.

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From: Mike Horvath
Subject: Re: Materials before or after bounded_by?
Date: 29 Jan 2016 12:21:04
Message: <56ab9f80$1@news.povray.org>

On 1/29/2016 11:24 AM, clipka wrote:
> Am 29.01.2016 um 11:49 schrieb Mike Horvath:
>> On 1/29/2016 5:15 AM, clipka wrote:
>>> Am 29.01.2016 um 10:31 schrieb Mike Horvath:
>>>> On 1/29/2016 4:20 AM, Mike Horvath wrote:
>>>>> Should the bounded_by statement be the very last statement in a CSG
>>>>> block? Or is it okay to have textures/materials/etc. come after?
>>>
>>> It's totally irrelevant.
>>>
>>>> Also, is there any benefit to using bounded_by in the following case?
>>>>
>>>> difference
>>>> {
>>>>       object {MyObject1}
>>>>       object {MyObject2}
>>>>       bounded_by {MyObject1}
>>>> }
>>>>
>>>> intersection
>>>> {
>>>>       object {MyObject1}
>>>>       object {MyObject2}
>>>>       bounded_by {MyObject1}
>>>> }
>>>
>>> That depends.
>>>
>>> If MyObject1 is significantly easier to compute than MyObject2, then it
>>> may indeed speed up rendering.
>>
>> What if they both happen to be spheres or cylinders? I.e. similar types
>> of objects.
>
> In that case it would be useless at best, and may actually slow down
> render times.
>
> To the best of my knowledge, that is. I still haven't spent enough time
> studying the bounding mechanism to understand every detail of it.
>

I am also wondering if both objects are cylinders, whether there is a 
benefit to bound the CSG using a box.


Mike

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From: Thomas de Groot
Subject: Re: Materials before or after bounded_by?
Date: 30 Jan 2016 02:57:49
Message: <56ac6cfd$1@news.povray.org>

On 29-1-2016 18:21, Mike Horvath wrote:
> On 1/29/2016 11:24 AM, clipka wrote:
>> Am 29.01.2016 um 11:49 schrieb Mike Horvath:
>>> On 1/29/2016 5:15 AM, clipka wrote:
>>>> Am 29.01.2016 um 10:31 schrieb Mike Horvath:
>>>>> On 1/29/2016 4:20 AM, Mike Horvath wrote:
>>>>>> Should the bounded_by statement be the very last statement in a CSG
>>>>>> block? Or is it okay to have textures/materials/etc. come after?
>>>>
>>>> It's totally irrelevant.
>>>>
>>>>> Also, is there any benefit to using bounded_by in the following case?
>>>>>
>>>>> difference
>>>>> {
>>>>>       object {MyObject1}
>>>>>       object {MyObject2}
>>>>>       bounded_by {MyObject1}
>>>>> }
>>>>>
>>>>> intersection
>>>>> {
>>>>>       object {MyObject1}
>>>>>       object {MyObject2}
>>>>>       bounded_by {MyObject1}
>>>>> }
>>>>
>>>> That depends.
>>>>
>>>> If MyObject1 is significantly easier to compute than MyObject2, then it
>>>> may indeed speed up rendering.
>>>
>>> What if they both happen to be spheres or cylinders? I.e. similar types
>>> of objects.
>>
>> In that case it would be useless at best, and may actually slow down
>> render times.
>>
>> To the best of my knowledge, that is. I still haven't spent enough time
>> studying the bounding mechanism to understand every detail of it.
>>
>
> I am also wondering if both objects are cylinders, whether there is a
> benefit to bound the CSG using a box.
>
>
> Mike

My guess is no. In general, I never use bounded_by; my experience 
(whatever that may be worth in this case) is that it slows the render.

-- 
Thomas

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From: Alain
Subject: Re: Materials before or after bounded_by?
Date: 31 Jan 2016 20:11:15
Message: <56aeb0b3$1@news.povray.org>

Le 16-01-29 12:21, Mike Horvath a écrit :
> On 1/29/2016 11:24 AM, clipka wrote:
>> Am 29.01.2016 um 11:49 schrieb Mike Horvath:
>>> On 1/29/2016 5:15 AM, clipka wrote:
>>>> Am 29.01.2016 um 10:31 schrieb Mike Horvath:
>>>>> On 1/29/2016 4:20 AM, Mike Horvath wrote:
>>>>>> Should the bounded_by statement be the very last statement in a CSG
>>>>>> block? Or is it okay to have textures/materials/etc. come after?
>>>>
>>>> It's totally irrelevant.
>>>>
>>>>> Also, is there any benefit to using bounded_by in the following case?
>>>>>
>>>>> difference
>>>>> {
>>>>>       object {MyObject1}
>>>>>       object {MyObject2}
>>>>>       bounded_by {MyObject1}
>>>>> }
>>>>>
>>>>> intersection
>>>>> {
>>>>>       object {MyObject1}
>>>>>       object {MyObject2}
>>>>>       bounded_by {MyObject1}
>>>>> }
>>>>
>>>> That depends.
>>>>
>>>> If MyObject1 is significantly easier to compute than MyObject2, then it
>>>> may indeed speed up rendering.
>>>
>>> What if they both happen to be spheres or cylinders? I.e. similar types
>>> of objects.
>>
>> In that case it would be useless at best, and may actually slow down
>> render times.
>>
>> To the best of my knowledge, that is. I still haven't spent enough time
>> studying the bounding mechanism to understand every detail of it.
>>
>
> I am also wondering if both objects are cylinders, whether there is a
> benefit to bound the CSG using a box.
>
>
> Mike

In the case of a difference, I doubt that it may help.
In the case of the intersection, when the remaining part is small 
relative to both parent objects, then, bounding with a box or sphere 
/may/ help as long as that object is as tight as possible around the 
important part.

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