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Le 2021-11-25 Ã  17:16, TheRealMorris a Ã©critÂ :
> Hi,
> 
> I'm using Povray 3.7.0.8 (which is the version coming straight from the Ubuntu
> 21.10 archives) and I'm trying to define a visible light source. I found this in
> the docs for povray 3.6 here:
> 
> http://www.povray.org/documentation/view/3.6.2/137/
> 
> So, just for a test I copy/pasted this into my scene:
> 
> 
> light_source
> { <0,0,0> color 1
>    looks_like
>    { sphere
>      { <0,0,0>,0.1
>        color { rgb 1 }
>        finish { ambient 1 }
>      }
>    }
>    translate <10,20,30>
> }
> 
> 
> But I get this error:
> 
> 
> File '/home/trm/light.pov' line 91: Parse Error: No matching } in 'sphere', {
> found instead Fatal error in parser: Cannot parse input.
> 
> Line 91 is the "color { rgb 1 }" one ...
> 
> 
> Did something change in the syntax in version 3.7 or is the example incorrect
> (or am I missing something basic)?
> 
> Thanks for any tips
> 
> 
> 
Replace Â«colorÂ» with Â«pigmentÂ».
Note : The keyword Â«colorÂ»/Â«colourÂ» is no
longer needed. It's a leftover 
from previous versions. Pre version 3.3.

Use this instead :

light_source
{ <10,20,30> rgb 1
   looks_like
   { sphere
     { <0,0,0>,0.1
       pigment { rgb 1 }
       finish { ambient 1 }
     }
   }
}

The coordinate of the looks_like is always relative to the light_source 
location.

[Alain Martel] Re: Ambient and cast shadows on metallic textures [14 hours and 45 minutes ago]

2021-11-26 18:02:13 UTC

Le 2021-11-25 Ã  14:00, Cousin Ricky a Ã©critÂ :
> On 2021-11-25 1:06 PM (-4), Alain Martel wrote:
>>
>> I came to the conclusion that metallic finishes should have zero ambient
>> through my own experimentation. The metallic textures from the various
>> includes looked just wrong to me.
> 
> Yes, they do look horrible!  My experiments with better metallic
> textures began very soon after I downloaded POV-Ray.
> 
>> I started by commenting out the
>> ambient. I got a massive improvement. Then, I tested with an explicit
>> zero ambient and got the best, most realistic, result.
> 
> As I implied in the OP, I adopted the policy of reducing the ambient in
> proportion to the diffuse, and wrote a macro to do this automatically.
> Since a highly specular surface would have a low diffuse component, this
> naturally leads to very low ambients.  But the ambients in metals.inc
> are *way* out of proportion to the diffuse components!
> 
>> When I first posted about it, I was unaware of Clipka's position on that
>> subject.
>>
>> The metallic finishes from metals.inc have been made to look acceptable
>> in an empty scene against a black background, and that's the only
>> situation where they look somewhat correct.
> 
> Or, how about using a bright sky_sphere along with a large hollow black
> sphere with no_reflection.  Our realistic low-ambient and no-ambient
> metals will show up fine, no need for metals.inc's insane ambients.
> 

Here is my edited versions of metals.inc and golds.inc.
I explicitly set all ambient to zero.

[kurtz le pirate] Re: How to ... [18 hours and 8 minutes ago]

2021-11-26 14:39:25 UTC

On 23/11/2021 21:00, Francois LE COAT wrote:
> Hi,
> 
> Bald Eagle writes:
>> Francois LE COAT wrote:
>>> For example, *.TRI format of 3D shapes contain <x,y,z> coordinates, and
>>> a color affected to these. If you use TRI2POV it gives a surface like...
>>>
>>>   <https://www.youtube.com/watch?v=Yf7q2KdAS-4>
>>>
>>> When you use TRI2POV it converts the surface in a set of smooth_triangle
>>> that can render the surface with ray-tracing. That exists since the very
>>> first versions of POV-Ray, and produces a very nice result.
>>>
>>> I hope that it is what you're thinking about. Some 3D file formats, like
>>> *.TRI is perfect to describe that kind of colored 3D surfaces. It's easy
>>
>> I don't believe I am aware of TRI2POV.  Where is it available?
>> I'm sure I have asked a similar question in the past, so I'm thinking 
>> that there
>> are a lot of other people who are unaware of this utility.
> 
> I have C sources for TRI2POV. But I remembered that it's ATARI software:
> "
> TRI-POV Converter Version 1.0 Sept/97
> Copyright (c) 1993 by Steve Anger
> And 97 by Archimedium
> 
> This program converts .TRI files generated by the Atari programs
> to POV-Ray or Vivid raytracer scene files. Bounding shapes are
> automatically generated for POV-Ray to greatly reduce the rendering time.
> 
> 
> Syntax:  tri2pov inputfile[.tri] [outputfile] [options]
> 
> Options:
> -snnn    - Generates smooth triangles. The boundaries between
triangles
>             are only smoothed if
the angle between the triangles is less
>             that nnn degrees. -s0
will not smooth any triangles while
>             -s180 will smooth all
triangles. Values from -s45 to -s90
>             usually work well. If
unspecified smoothing defaults to -s60.
> 
> -op      - Output to POV-Ray 1.0 format
> -op2     - Output to POV-Ray 2.0 format (2.0 is unreleased as
yet)
> -op3     - Output to POV-Ray 3.0 format (default)
> -ov      - Output to Vivid 2.0 format
> -or      - Output to Raw triangle format.
> 
> -lxnnn   - Set look_at x coord to nnn
> -lynnn   -  '     '   
y   '   '   '
> -lznnn   -  '     '   
z   '   '   '
> 
> -vxnnn   - Set view_point x coord to nnn
> -vynnn   -  '      
'     y   '   '   '
> -vznnn   -  '      
'     z   '   '   '
> 
> e.g. tri2pov car.tri car.pov -s60.0
> 
> 
> 
                                 
Steve Anger, Guelph, ON, Canada
> 
                                 
CIS: 70714,3113
> 
                                 
Internet: 707### [at] compuservecom
> 
                                 
ADEnet Boards i.e.:TGA: (510)524-2780
> 
> Archimedium WEB: http://www.ief.u-psud.fr/~lecoat
> E-mail: lec### [at] iefu-psudfr
> "
> I modified it a long time ago. It works well. I can send you sources...
> 
> Best regards,
> 

This utility looks interesting.
I'd like the sources. If it is not too complicated, the conversion from 
C to POV SDL can be considered.

My email address is valid.


-- 
Kurtz le pirate
Compagnie de la Banquise

[Dave Blandston] Re: Music Video Project Finished [1 day and 3 minutes ago]

2021-11-26 08:45:00 UTC

"jr" <cre### [at] gmailcom> wrote:
> hi,
>
> those "Bordered Characters" have come a long way.  :-)  nice.
>
>
> regards, jr.

Ha ha you caught me! Have an awesome day!

[Thomas de Groot] Re: Trouble defining a visible light source [1 day 1 hour and 18 minutes ago]

2021-11-26 07:29:56 UTC

Op 26/11/2021 om 00:03 schreef TheRealMorris:
> =?utf-8?Q?Harald_J=C3=B6rg?= <haj### [at] posteode> wrote:
>> TheRealMorris writes:
>>
>>> I'm using Povray 3.7.0.8 (which is the version coming straight from the Ubuntu
>>> 21.10 archives) and I'm trying to define a visible light source. I found this in
>>> the docs for povray 3.6 here:
>>>
>>> http://www.povray.org/documentation/view/3.6.2/137/
>>>

Tip: When using the POV-Ray documentation, always use the wiki version 
as that is the most up-to-date. Your document page can now be found here:

https://wiki.povray.org/content/Knowledgebase:Language_Questions_and_Tips#Topic_1

Personally, I most often start with:

https://wiki.povray.org/content/Reference:Keywords


-- 
Thomas

[Thomas de Groot] Re: Ambient and cast shadows on metallic textures [1 day 1 hour and 26 minutes ago]

2021-11-26 07:21:04 UTC

Op 25/11/2021 om 20:00 schreef Cousin Ricky:
> On 2021-11-25 1:06 PM (-4), Alain Martel wrote:
>>
>> The metallic finishes from metals.inc have been made to look acceptable
>> in an empty scene against a black background, and that's the only
>> situation where they look somewhat correct.
> 
> Or, how about using a bright sky_sphere along with a large hollow black
> sphere with no_reflection.  Our realistic low-ambient and no-ambient
> metals will show up fine, no need for metals.inc's insane ambients.
> 

<hint> There is a task for you to correct the metals.inc content for the 
future users generations and, on a more serious note, for (future) 
downloads of the POV-Ray package. </hint> ;-)

-- 
Thomas

[jr] Re: Music Video Project Finished [1 day 1 hour and 28 minutes ago]

2021-11-26 07:20:00 UTC

hi,

"Dave Blandston" <IsN### [at] protonmailch> wrote:
> Greetings Friends,
>
> This was a fun project! ...

those "Bordered Characters" have come a long way.  :-)  nice.


regards, jr.