Le 2019-09-13 à 18:26, William a écrit :
> "William" <wil### [at] gmailcom> wrote:
>> William F Pokorny <ano### [at] anonymousorg> wrote:
>>> On 9/13/19 4:17 PM, William wrote:
>>>> Hello all,
>>>> I am a newbie in POV-ray and I am trying to generate a image with transparent
>>>> background.
>>>>
>>>> I used:
>>>> background{colour rgbt <0.0, 0.0, 0.0>}
>>>>
>>>> and I got a black background. Can anybody please provide your support to get a
>>>> black background?
>>>>
>>>> Thanks.
>>>>
>>>> William
>>>>
>>>
>>> Taking you not to be asking exactly what you asked, try:
>>>
>>> background { colour rgbt <0,0,0,1> }
>>>
>>> Your three values get promoted to 4 and the 't' values becomes 0 - or no
>>> transparency. Remember to use +ua and the default png type output(1).
>>>
>>> Bill P.
>>>
>>> (1) I think openexr is the other which supports the transparency, but I
>>> don't much use the feature myself so maybe not... Most image formats
>>> don't support it.
>>
>>
>> Hi Bill,
>>
>> Thank you for your reply. My initial settings are like this below:
>> #include "colors.inc"
>> background {color rgbt <0, 0, 0, 1> }
>>
>> #declare MainColor = rgb<1.0,0.0,0.0>;;
>>    camera {
>>      angle 45
>>      location <150.92993637586693,30.07787677021389,97.7056826656392>
>>      look_at <25,25,25>
>>    }
>>    light_source { <101.28273227706191,100.10083875733939,98.7618381976087> color
>> White shadowless}
>>
>>
>> I don't know how to intiate the UA setting. Can you please elaborate this?
>>
>> William
> 
> 
> 
> Got it.. I added these two lines in the .ini file. Then it worked well.
> 
> Output_File_Type=N
> Output_Alpha=on
> 
> Best, William
> 
> 
You can add «+ua» on the command line. In the Windows version, it's the 
box just right of the resolution drop list.

Alain

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