Le 17-12-19 à 17:37, Stephen a écrit :
> On 19/12/2017 21:38, Alain wrote:
>> Le 17-12-18 à 22:12, Masaki  a écrit :
>>> Thanks for the reply.
>>> I have some new questions.
>>>
>>>> There are a couple of things wrong with your scene. First, your lights
>>>> and objects are inside the Prism. So you will not see anything.
>>> (1) Does it mean that I can not see the light from the outside of the 
>>> prism when
>>> there is a light source in the prism which is transparent object?
>>
>> I think that he miss the transparency.
> 
> I did.
> 
> 
>> As your prism is transparent, light will shine through.
>>
>>>
>>>
>>> (2) In pov-ray, is it possible for the camera to visualize the direct 
>>> light from
>>> the source?
>>
>> Never ever.
>> The light_source is an abstraction that have no tangible existence. It 
>> just illuminate things. For a light_source to be visible, you need to 
>> associate it with some object, usually by the use of looks_like{...}
>> It can also be achieved using an union that include the light.
> 
> There is always the "Looks_like" in the camera statement.
> 
> 
Not in the camera but in the light_source.

light_source{
  <100, 100, 75> rgb 1
  area_light 0.5*x 0.5*y 17 17 circular orient adaptive 0
  looks_like{sphere{0 1 pigment{rgb 1}finish{emission 1 diffuse 0}}}
}

It should be noted that the location of the looks_like object is 
relative to the light's location.

The other option is an union:

union{
  light_source{
    0 rgb 1
    area_light 0.5*x 0.5*y 17 17 circular orient adaptive 0
   }
  sphere{0 1  pigment{rgb 1}finish{emission 1 diffuse 0} no_shadow}
  translate <100, 100, 75>
  }

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