Op 05/08/2020 om 18:46 schreef MichaelJF:
> Sorry for the short delay of now some five years. I was occupied by some 
> RL issues a while and frustrated after loosing all codes by a headcrash 
> on a very new harddrive. Nearly, I had finished a very nice scene (The 
> Lonely Swan) and lost all the code. Later I experienced a very heavy 
> work load and at the beginning of this year a very severe disease of the 
> lung. Now I bought a new machine and thought that this open issue would 
> be a very nice test (core i7 vs. core i9). I rendered the image due to 
> Clipkas suggestions with diffuse albedo 0.5,0.4 on all balloons. It has 
> an little bit different mood since the colouring of the balloons is more 
> visible in the distance. The backside illumination has a severe 
> drewback: it doesn't work with the colour Blue.
> 
> Enjoy
> Michael
> 

Welcome back indeed!

I compared to the original scene from 2015. I prefer the original. Maybe 
you could decrease both the diffuse albedo and the backside illumination 
of the balloons a bit? Or maybe only the diffuse albedo as I think it is 
too strong for the remainder of the scene. If I remember correctly from 
the times I use diffuse albedo, it looks much stronger than the classic 
diffuse and has to be tempered.

-- 
Thomas

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Am 05.08.2020 um 20:19 schrieb William F Pokorny:
> On 8/5/20 12:46 PM, MichaelJF wrote:
> ....
>> Now I bought a new machine and thought that this open issue would be a 
>> very nice test (core i7 vs. core i9). I rendered the image due to 
>> Clipkas suggestions with diffuse albedo 0.5,0.4 on all balloons. It 
>> has an little bit different mood since the colouring of the balloons 
>> is more visible in the distance. The backside illumination has a 
>> severe drewback: it doesn't work with the colour Blue.
> 
> Welcome back! I've been otherise hacking at the source code today so 
> took a quick look at the related code on seeing your post.
> 
> I don't see anything obvious against blue. My guess is it's that the 
> blues of your balloons are quite dark. When the code multiplies the dark 
> blue value by the backside value*(light * etc) there just isn't much of 
> an adder. Dark+dark still ends up pretty dark - more true if your light 
> source doesn't have much blue in it; If it's flame colored.
> 
> I've played a little with making the backside values larger than they 
> 'should be' but probably that cheat won't work well with, for example, 
> your world map where the bottom looks to be mostly white-ish. Maybe just 
> brighten the blues some on balloons with a lot of dark blue <1,1,2>*...?
> 
> I like the image. It reminds me of a balloon festival I attended a 
> couple times, now 20 years or more ago. Time flies.
> 
> Bill P.
Hi Bill, thanks for your looking into the codes. I can report my results 
only. The balloons in the enclosed image are all rendered with

#declare BText11 = texture {
    pigment { color Red }
    #if (TransparentTex)
       finish { diffuse albedo 0.55,0.4 }
    #end
}

at the position of the red balloon in the original image. Red exchanged 
to Green or Blue from colors.inc of course. Green seems to be most 
addictive to backlight illumination. Blue seems to be ignorant to this 
feature. Without the albedo I got similiar results.

I wanted to report my observations, I cannot see an urgend need to 
investigate this issue. Seems, I'm the first after the release of this 
issue who noticed this.

Best regards
Michael

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Am 06.08.2020 um 08:36 schrieb Thomas de Groot:
> Op 05/08/2020 om 18:46 schreef MichaelJF:
>> Sorry for the short delay of now some five years. I was occupied by 
>> some RL issues a while and frustrated after loosing all codes by a 
>> headcrash on a very new harddrive. Nearly, I had finished a very nice 
>> scene (The Lonely Swan) and lost all the code. Later I experienced a 
>> very heavy work load and at the beginning of this year a very severe 
>> disease of the lung. Now I bought a new machine and thought that this 
>> open issue would be a very nice test (core i7 vs. core i9). I rendered 
>> the image due to Clipkas suggestions with diffuse albedo 0.5,0.4 on 
>> all balloons. It has an little bit different mood since the colouring 
>> of the balloons is more visible in the distance. The backside 
>> illumination has a severe drewback: it doesn't work with the colour Blue.
>>
>> Enjoy
>> Michael
>>
> 
> Welcome back indeed!
> 
> I compared to the original scene from 2015. I prefer the original. Maybe 
> you could decrease both the diffuse albedo and the backside illumination 
> of the balloons a bit? Or maybe only the diffuse albedo as I think it is 
> too strong for the remainder of the scene. If I remember correctly from 
> the times I use diffuse albedo, it looks much stronger than the classic 
> diffuse and has to be tempered.
> 
Hello Thomas,

I agree completely. I Like the original better as well. But I wanted to 
give Clipkas proposals a try and it was an excellent test to my new 
machine. If I ever come up with the idea of a night glow scene I will 
revisit this scene.

Best regards
Michael

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