Stan wrote:

> When I don't use HDR I can change it reflection, brilliance and other. But when
> I use HDR floor is just white or gray(

What exactly do you mean by "use HDR", are you talking
about a HDR environment or outputting HDR images? How do
you use it, can you show a piece of code?

The floor object itself should remain a white reflecting plane,
no change change required whether you use HDR or not.

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Am 04.10.2011 22:34, schrieb Stan:
>
>> Taking a wild guess, you possibly see reflections of the HDR background
>> on the floor and don't want those. In that case, instead of using a
>> sky_sphere for the HDR background you can use a very large sphere with
>> the "no_reflection" keyword.
> Thank you, but i found it)
> http://xmages.net/storage/10/1/0/2/5/thumb/thumb_9fcaddc5.jpg
> This is my render of lego set.
> The problem I have is floor.
> When I don't use HDR I can change it reflection, brilliance and other. But when
> I use HDR floor is just white or gray(

What you describe doesn't sound like you're using POV-Ray directly. Are 
you perhaps using a 3rd party tool to convert your Lego set to POV-Ray 
format, and using HDR is one option of that tool?

If so, please consult the documentation of that tool; if there's no way 
to do that with the tool, you may need to manually edit the generated 
.pov file before rendering.

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> What you describe doesn't sound like you're using POV-Ray directly. Are
> you perhaps using a 3rd party tool to convert your Lego set to POV-Ray
> format, and using HDR is one option of that tool?
>
Yes I am using L3p tool. It converts *.ldr(ldraw format file) to Pov-Ray
But I discribe lighting manual.


#declare LDRAW_RAD_LEVEL = 5; // 5=final
#declare LDRAW_MTL = 256;
#declare INDEXOFREFRACTION=1.52;
#declare LDRAW_RAD_NORMAL = off;
#declare LDRAW_RAD_MEDIA = off;

#include "rad_def.inc"
global_settings {
  assumed_gamma 1.4
  max_trace_level LDRAW_MTL
  adc_bailout 0.01/2
  radiosity {
    Rad_Settings(LDRAW_RAD_LEVEL, LDRAW_RAD_NORMAL, LDRAW_RAD_MEDIA)
  }
}

    sphere {
   <0,0,0>,10000
   pigment {
     image_map { hdr "entrance1_color" once interpolate 2 map_type 1 }
   }
   finish {  emission 1 }
   hollow
   no_image
   no_reflection
          no_shadow
 }

I use radiosity, and HDR lighting. I add Hdr image to sphere.

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Am 05.10.2011 10:03, schrieb Stan:
>
>> What you describe doesn't sound like you're using POV-Ray directly. Are
>> you perhaps using a 3rd party tool to convert your Lego set to POV-Ray
>> format, and using HDR is one option of that tool?
>>
> Yes I am using L3p tool. It converts *.ldr(ldraw format file) to Pov-Ray
> But I discribe lighting manual.
(*snip*)

Looks ok to me so far; what texture are you using (or trying to use) for 
the floor?

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> Looks ok to me so far; what texture are you using (or trying to use) for
> the floor?

// Floor:
object {
 plane { y, floor_height hollow }
 pigment { rgb <0,0,0> }
 finish {
         ambient 0.
         diffuse 1
                 brilliance 5
                 metallic
                 specular 0.80
                 roughness 1/100
                 reflection 0.9

        }
}

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Am 05.10.2011 18:18, schrieb Stan:
>
>> Looks ok to me so far; what texture are you using (or trying to use) for
>> the floor?
>
> // Floor:
> object {
>   plane { y, floor_height hollow }
>   pigment { rgb<0,0,0>  }
>   finish {
>           ambient 0.
>           diffuse 1
>                   brilliance 5
>                   metallic
>                   specular 0.80
>                   roughness 1/100
>                   reflection 0.9
>
>          }
> }

Are you aware that this surface will never catch any shadows, because it 
is purely reflective (due to the black pigment)?

Also note that with HDR (i.e. radiosity-based) illumination, the 
brilliance, specular and roughness parameters have no effect.

You will also never get sharp shadows in this manner (though you can 
improve the sharpness of the shadows by specifying a low maximum_reuse 
value, of course at the cost of rendering time).

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Am 05.10.2011 10:03, schrieb Stan:

> global_settings {
>    assumed_gamma 1.4

I strongly suggest you use assumed_gamma 1.0; it's the only way to get 
proper color math.

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Am 05.10.2011 10:03, schrieb Stan:

>      sphere {
>     <0,0,0>,10000
>     pigment {
>       image_map { hdr "entrance1_color" once interpolate 2 map_type 1 }
>     }
>     finish {  emission 1 }
>     hollow
>     no_image
>     no_reflection
>            no_shadow
>   }

Try reducing the emission; most HDR images are too bright to be used 
with emission 1, and may "drown" any reflections in a sea of pure white.

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> Also note that with HDR (i.e. radiosity-based) illumination, the
> brilliance, specular and roughness parameters have no effect.
>
This is the question! Thank you for you answer. But I ask how to configure floor
to have brilliance, and other. I make mistake, I use not black pigment, I use
white. Is it possible? I am new user of Pov-Ray and don't know a lot.

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On 06/10/2011 8:09 AM, Stan wrote:
> I make mistake, I use not black pigment, I use
> white. Is it possible? I am new user of Pov-Ray and don't know a lot.

pigment { rgb <0,0,0> } is black, pigment { rgb <1,1,1> } is white, 
pigment { rgb <1,0,0> } is red and so on.

-- 
Regards
     Stephen

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