On 2/21/2017 10:59 PM, zhekai wrote:
> Thanks for the reply. I did use sphere. But I am not sure if it is the same as
> the "sky sphere". Here is my mini example, and I used "-W1920 -H1080 -A0.3 +UA"
> to rendering it:


Just a quick reply.

You need to tell PovRay which version you are using as there is a 
difference between the current 3.7 and 3.6

Your camera is looking at a white plane behind your spheres. That is one 
reason you are getting no transparency.

Use a background colour with transparency set to 1

Like Bald Eagle it is a long time since I used the Alpha channel and a 
long time since I slept. Maybe someone not in Europe will pick this up.


-- 

Regards
     Stephen

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