Le 18-07-29 à 09:36, Mike Horvath a écrit :
> On 7/28/2018 11:43 AM, Alain wrote:
>> If you reduce the ior, then, the reflection will also go down.
>>
>> The minimum reflection is to high at 0.2.
>> Try :
>> reflection{0, 1 fresnel}
>> or simply
>> reflection{1 fresnel}
>>
>> Try this interior :
>> interior{
>>   ior 1.5
>>   dispersion 1.05
>>   fade_colour Col_Ruby fade_distance 0.1 fade_power 1001
>> }
>>
>> Col_Ruby is the same as Col_Glass_ruby but without the filter component.
>>
>> With this pigment :
>> pigment{rgbt 1}
>>
>>
> 
> The dispersion really causes the render times to increase. I don't know 
> if I have the patience.
> 
> Mike

It's obvious that dispersion cause increased render time, for each 
incident ray, it generate dispersion_samples outgoing rays with a 
default of 7.

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