On 16-10-2013 6:31, posfan12 wrote:
> I tried increasing the size of the media surrounding the sun and it
> completely disappeared. Is that the stupid epsilon again?
>

No, it probably has to do with the scaling. If you increase the size of 
the container you have to decrease proportionally the scattering media 
in order to keep the same visible effect. In your code this would mean 
for example:

#declare corona_size = 100;

	sphere
	{
		0, corona_radius
		hollow
		material
		{
			texture
			{
				pigment {rgbt 1}
			}
			interior
			{
				media
				{
					scattering {1, light_color/20/corona_size}	// needs to be divided 
by corona_radius doesn't it?
					//emission light_color/1000
					density
					{
						function{1/(x*x + y*y + z*z)/corona_radius}
						density_map
						{
							[0 rgb 0]
							[1 rgb 1]
						}
						scale corona_radius
					}
				}
			}
		}
scale corona_size
	}


Your use of corona_radius is OK but may complicate things. I would 
suggest to develop your media on a unit scale sphere and only then 
rescale it all at once. You do not need corona_radius in that case.

Thomas

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