>> Alain<aze### [at] qwertyorg> wrote:

>>>> I installed Pov-ray 3.7 and with some little changes on code I got
>>>> this render:
>>>>
>>>> http://img829.imageshack.us/img829/8692/modsmega.png
>>>>
>>>> I didn't remove the save_file/load_file because I dind't find that.
>>>>
>>>> And where are the ini files of megapov? I tried Tools> Edit master,
>>>> but this
>>>> option doesn't exits.
>>>>
>>>>
>>>>>> map_type 7 don't exist, you should transform the light probe to
>>>>>> latitude-longitude format.
>>>>
>>>> I didn't do any thing like that.
>>>>
>>>>
>>>> Sorry to only post here today and sorry for my total ignorance in
>>>> this area but
>>>> as I said this is not my area.
>>>>
>>>>
>>>> Do you have some explation or advice to show me why my render is
>>>> with this
>>>> little white points?
>>>>
>>>>
>>>> Thanks for everybody
>>>>
>>>>
>>>
>>> Do you talk about the white pixels on the table? Or you are talking
>>> about the curves and circles on the printed board?
>>>
>>> On the tabble, it looks somewhat like a negative crand or stray, low
>>> density, photons. It don't looks like it's a reflective surface, so, I
>>> ruled out the reflection of a background.
>>>
>>> On the mother board:
>>> It could be photons.
>>> It could be a strange problem with the texture.
>>>
>>> Also, the texture on the top part of the metallic components is
>>> suspicious.
>>>
>>> If your scene does have photons, try disabling it by commenting out the
>>> protons block in the global_settings.
>>>
>>> Check if you have any #default texture anywhere in your scene.
>>>
>>> You use radiosity, try adjusting the parameters, the light and dark
>>> molting on the connectors are not supposed to be there. Do you use an
>>> HDR light probe? How did you used it? (sample code please)
>>>
>>>
>>>
>>>
>>> Alain
>>
>> Hi,
>> I've run into a similiar problem. I've managed to get everything
>> working in
>> povray 3.7, except that i get some weird white specks.
>>
>> These specks appear everywhere, but are most noticable on the main
>> PCB. I've
>> uploaded a small scene which produces these specks here:
>> http://www.justgeek.de/stuff/povray/example.pov
>> The hdr file (
>> http://www.justgeek.de/stuff/povray/kitchen_probe_lat.hdr ) is
>> from http://ict.debevec.org/~debevec/Probes/ converted to a lat / long
>> format
>> using HDRshop.
>>
>> I've played around with the radiosity settings, but i always get the
>> white
>> specks.
>> An example can be found here:
>> http://www.justgeek.de/stuff/povray/example-5-3.png (warning, due to
>> the specks
>> this is 2.5 MB big)
>>
>> As far as i can tell, i don't have any photons, i have used high quality
>> settings and there is no texture used for the board. I can't imagine
>> that it is
>> a reflection from the surroundings.
>>
>> Has anyone got an idea what could cause this?
>>
>> Bye,
>> NsN
>>
Was to quick :(
The plane is not the problem, but, anyway, that plane is useless been 
under your table.

The problem is the way you apply your light probe.

Any image_map, by default, is maped to a 1x1 square, and tiled verticaly 
and horizontaly ad infinitum.
Your environment sphere have a radius of 800, meaning that your probe is 
repeated 800 time from the equator to the pole, 1600 times from top to 
bottom, 1600 times from side to side.

The speckling you see is due to that tiling that get reflected on every 
reflective surface.
It also explain the circular nature of the speckling.

The cure: Add map_type 1 just after the file's name.

pigment{image_map{hdr "kitchen_probe_lat.hdr" map_type 1 interpolate 2}}




Alain

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