Le 2023-11-11 à 09:22, Mike Miller a écrit :
> Alain Martel <kua### [at] videotronca> wrote:
>>> 6 plants made from smooth triangle billboards. These render much faster than the
>>> clipped sphere approach I was originally using. Scene file posted.
>>> Miller
>>>
>> Those are nice. Make them into mesh to use the instanciation feature of
>> the meshes.
>> So, instead of :
>> #declare ST_leaf =
>>      union {
>>       //--left 1/2
>>       smooth_triangle { p11, n1, p4,  n1, p6,  n1 }
>>       smooth_triangle { p11, n1, p10, n1, p4,  n1 }
>>       smooth_triangle { p9,  n1, p10, n1, p11, n1 }
>>       smooth_triangle { p9,  n1, p8,  n1, p10, n1 }
>>       smooth_triangle { p15, n1, p8,  n1, p9,  n1 }
>>       smooth_triangle { p15, n1, p14, n1, p8,  n1 }
>>       smooth_triangle { p2,  n1, p15, n1, p5,  n1 }
>>       smooth_triangle { p2,  n1, p14, n1, p15, n1 }
>>       //--right 1/2
>>       smooth_triangle { p11, n5, p3,  n5, p12, n5 }
>>       smooth_triangle { p11, n5, p6,  n5, p3,  n5 }
>>       smooth_triangle { p9,  n5, p12, n5, p7,  n5 }
>>       smooth_triangle { p9,  n5, p11, n5, p12, n5 }
>>       smooth_triangle { p15, n5, p7,  n5, p13, n5 }
>>       smooth_triangle { p15, n5, p9,  n5, p7,  n5 }
>>       smooth_triangle { p1,  n5, p15, n5, p13, n5 }
>>       smooth_triangle { p1,  n5, p5,  n5, p15, n5 }
>>       }
>>
>> Use this :
>> #declare ST_leaf =
>>      mesh{
>>       //--left 1/2
>>       smooth_triangle { p11, n1, p4,  n1, p6,  n1 }
>>       smooth_triangle { p11, n1, p10, n1, p4,  n1 }
>>       smooth_triangle { p9,  n1, p10, n1, p11, n1 }
>>       smooth_triangle { p9,  n1, p8,  n1, p10, n1 }
>>       smooth_triangle { p15, n1, p8,  n1, p9,  n1 }
>>       smooth_triangle { p15, n1, p14, n1, p8,  n1 }
>>       smooth_triangle { p2,  n1, p15, n1, p5,  n1 }
>>       smooth_triangle { p2,  n1, p14, n1, p15, n1 }
>>       //--right 1/2
>>       smooth_triangle { p11, n5, p3,  n5, p12, n5 }
>>       smooth_triangle { p11, n5, p6,  n5, p3,  n5 }
>>       smooth_triangle { p9,  n5, p12, n5, p7,  n5 }
>>       smooth_triangle { p9,  n5, p11, n5, p12, n5 }
>>       smooth_triangle { p15, n5, p7,  n5, p13, n5 }
>>       smooth_triangle { p15, n5, p9,  n5, p7,  n5 }
>>       smooth_triangle { p1,  n5, p15, n5, p13, n5 }
>>       smooth_triangle { p1,  n5, p5,  n5, p15, n5 }
>>       }
>>
>> That way, you can place 1000's of copies of the same plant that'll use
>> only the storage for a single one.
> 
> 
> Alain,
> thank you so much! I will definitely fix that. It's been a long time since I
> worked with triangles in POV...
> 
> I have a new problem ..haha. Now that I've converted these billboards to smooth
> triangles, I'm getting a new fog bug showing up in reflections. I'm posting a
> snippet of a rendering I did last night using these plants in my nest scene.
> Billboards that cross in front the water renders without fog. Strange...may just
> give up on using them in this scene. :-)
> Mike
> 
> 

Triangles do have an interior and an exterior. Try using hollow. It MAY 
help... Or not.

mesh{	...
	...
	...
  hollow
  }

Next, you may be faced with the tracing and sampling of that fog. Here, 
the presence or absence of turbulence is probably not a factor.
You may need to use scattering media with the render time taking a 
serious hit.

But, yes. Fog and media tend to not play nice with transparency.

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