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From: Le Forgeron
Subject: Proof of concept: Edge detector (as pattern), sort of
Date: 16 Mar 2011 07:15:25
Message: <4d809bcd@news.povray.org>
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Edge detector (as pattern), sort of.
Just a quick (and bad) test, 100% SDL, 100% CSG.
Ambient & Diffuse : <1,0>,<1/2,1/2>,<0,1>
I do not like:
- it's not a map (and a map cannot be used)
- the distribution in space (crude square/line are visible)
- it uses a lot of objects, hence memory!
- the sampling is limited at 256 entries... here with 125.
How ? so far just with average pattern and many object patterns (with a
bit of translate).
--
Software is like dirt - it costs time and money to change it and move it
around.
Just because you can't see it, it doesn't weigh anything,
and you can't drill a hole in it and stick a rivet into it doesn't mean
it's free.
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Download 'proximity1.png' (218 KB)
Download 'proximity2.png' (214 KB)
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Preview of image 'proximity1.png'
Preview of image 'proximity2.png'
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Le_Forgeron <lef### [at] free fr> wrote:
> Edge detector (as pattern), sort of.
>
> Just a quick (and bad) test, 100% SDL, 100% CSG.
>
> Ambient & Diffuse : <1,0>,<1/2,1/2>,<0,1>
>
> I do not like:
> - it's not a map (and a map cannot be used)
> - the distribution in space (crude square/line are visible)
> - it uses a lot of objects, hence memory!
> - the sampling is limited at 256 entries... here with 125.
>
> How ? so far just with average pattern and many object patterns (with a
> bit of translate).
>
>
>
>
>
> --
> Software is like dirt - it costs time and money to change it and move it
> around.
>
> Just because you can't see it, it doesn't weigh anything,
> and you can't drill a hole in it and stick a rivet into it doesn't mean
> it's free.
Looks alright. I does look like you have some coincident surface at some faces.
Rather than applying the averaged object pattern directly, maybe trun it into a
function first, then you could maybe work on some interpolation that would help
smooth the blockiness.
-tgq
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From: Le Forgeron
Subject: Re: Proof of concept: Edge detector (as pattern), sort of
Date: 16 Mar 2011 11:22:30
Message: <4d80d5b6$1@news.povray.org>
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Le 16/03/2011 15:22, Trevor G Quayle a écrit :
> I does look like you have some coincident surface at some faces.
where ?
I failed to spot that.
Could you provide some indication ? (if on front-face, you might provide
the ring number and the hour)
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Le_Forgeron <lef### [at] freefr> wrote:
> Le 16/03/2011 15:22, Trevor G Quayle a écrit :
> > I does look like you have some coincident surface at some faces.
>
> where ?
> I failed to spot that.
> Could you provide some indication ? (if on front-face, you might provide
> the ring number and the hour)
I have circled some of the incidences in the pic attached. Perhaps they are not
conicident surfaces but some other artifact.
-tgq
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From: Le Forgeron
Subject: Re: Proof of concept: Edge detector (as pattern), sort of
Date: 16 Mar 2011 18:18:49
Message: <4d813749@news.povray.org>
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Le 16/03/2011 16:48, Trevor G Quayle nous fit lire :
> Le_Forgeron <lef### [at] freefr> wrote:
>> Le 16/03/2011 15:22, Trevor G Quayle a écrit :
>>> I does look like you have some coincident surface at some faces.
>>
>> where ?
>> I failed to spot that.
>> Could you provide some indication ? (if on front-face, you might provide
>> the ring number and the hour)
>
> I have circled some of the incidences in the pic attached. Perhaps they are not
> conicident surfaces but some other artifact.
>
Indeed, there was only one CSG-component there. I did say I did not like
the space distribution.
Here attached a test with an implementation which allow a map. (but
that's not SDL anymore). The object is sampled around the intersection
point in a sphere whose relative radius to the radius of the big sphere
(there is 3 of them) is the printed number.
Top object is the normal object with uniform texture.
The map is display around it with a gradient.
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> Indeed, there was only one CSG-component there. I did say I did not like
> the space distribution.
>
It is possible to get coincident surfaces from a pattern that has a sharp
transition that coincides with an object surface as well, not just two objects.
I noted it as possible coincident surface because it is only apparent on flat
surfaces.
-tgq
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