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Comparison Path depth 42 to 6

Posted: Wed Apr 10, 2019 7:12 pm
by FarbigeWelt
Four Colors Fluid Simulation in a Tube_GPU path_500 samples, 6 depth_dnpg  with caustics_64'000 bubbles_8h58m28s.jpg
Four Colors Fluid Simulation in a Tube_GPU path_500 samples, 6 depth_dnpg with caustics_64'000 bubbles_8h58m28s
Four Colors Fluid Simulation in a Tube_difference 500 to 461 samples, pgi_with_caustics path_depth 6 to pgi_no_caustics path_depth 42; gamma 2.0, brightness 4_.jpg
Four Colors Fluid Simulation in a Tube_difference 500 to 461 samples, pgi_with_caustics path_depth 6 to pgi_no_caustics path_depth 42; gamma 2.0, brightness 4
This time total path depth showed an impact of render speed (approx. 25%) but also very obvious on image quality. For me it is a little mistery how good the bubbles are visible and how wrong the glass tube looks like. One may know the tube is multi layered, it cconsists actually of two similar glass tube of which one is slightly smaller. This way collision detection quality is increased but does not make much sense for the final render. The next shot is with total path depth 6 and the other three depths set to 5. The same setting as for the picture in this post but with second tube set invisble.

Code: Select all

time		Samples	mSamples/s
11:32:53	461	25.9
06:20:13	238	24.2
10:52:59	445	25.3
08:58:28	500	29.7

Re: Different Works in Progress

Posted: Wed Apr 10, 2019 7:55 pm
by Fox
The bubble line is not straight with glass wall. Can you boolean modifier cut the bubbles with glass mesh and ctrl-L delete all bubbles that got unmanifold?

Re: Different Works in Progress

Posted: Thu Apr 11, 2019 9:25 am
by FarbigeWelt
Fox wrote:
Wed Apr 10, 2019 7:55 pm
The bubble line is not straight with glass wall. Can you boolean modifier cut the bubbles with glass mesh and ctrl-L delete all bubbles that got unmanifold?
With particles from simulation it is not so easy to follow your suggestion. It is easier to increase the size of the tube to avoid overlapping with the bubbles. I will set up this as next.

Strange look with Bubbles Not Touching the Tube

Posted: Thu Apr 11, 2019 9:23 pm
by FarbigeWelt
Total path depth 22, the other dephts 20.
Four Colors Fluid Simulation in a Tube_GPU path_166 samples, 22 depth_dnpg with caustics_larger tube_64'000 bubbles_3h40m19s.jpg
Four Colors Fluid Simulation in a Tube_GPU path_166 samples, 22 depth_dnpg with caustics_larger tube_64'000 bubbles_3h40m19s
Not really what the image is supposed to look like. :(

Further ivestigation is required, to understand what is going here with the bubbles in the water inside the tube. Might be a priority issue of volumes or so. Thought up to date this should follow air p=0, tube p=1, liquid p=2, bubbles made from water with air outside and inside. Because it is actually an at least three phase problem I don't know exactly what to set here.

The tube contains a liquid (water). Around tube and above the liquid is air (clear volume).

The liquid has a top surface, the first outer volume (air), the liquid is in the tube, the second outer volume (glass) and the liquid has its own inner volume.

The bubble is made from water and air. Its inner outer volume is air, its inner volume is water, is outer outer volume is the liquid (water) or air (if the bubble is on the surface of the liquid).

I am bit lost due to missing logical solutions of these two trilemas.

Re: Different Works in Progress

Posted: Thu Apr 11, 2019 10:39 pm
by Fox
p2 glass
p1 air
beer 0 :ugeek:

Re: Different Works in Progress

Posted: Fri Apr 12, 2019 12:30 am
by FarbigeWelt
Fox wrote:
Thu Apr 11, 2019 10:39 pm
p2 glass
p1 air
beer 0 :ugeek:
Well, thank you, at least it was a try worth. I permuted the few possibilities but none of them showed just any close to real image.

It was not me if I did not try a new approach by following my intuition after the first not appropriate looking pictures. I should not have rejected this solution. The first 175 samples look promising. I will post it as soon I am confident with the result.

Thanks for the little punch. :)

Four colors liquid

Posted: Sat Apr 13, 2019 8:14 am
by FarbigeWelt
All path depths are 16. The gif is animated.
EDIT: first version of gif replaced, due to wrong sized frames.
Four-Colors-Bubbles.gif
Four-Colors-Bubbles

Re: Different Works in Progress

Posted: Sat Apr 13, 2019 11:32 am
by Fox
Collisions still look dark, :roll:
Can you share the scene?
------
EDIT

I guess it's the material color, when red green blue get in same area, light can't get through. So it's correct.
With null material and small absorption for bubble volume, the light path depth would continue forever and the speed should be much slower with high path depth.

Example:
Bubbles_Fox.jpg

Re: Different Works in Progress

Posted: Sat Apr 13, 2019 5:24 pm
by FarbigeWelt
Fox wrote:
Sat Apr 13, 2019 11:32 am
Collisions still look dark, :roll:
Can you share the scene?
------
EDIT

I guess it's the material color, when red green blue get in same area, light can't get through. So it's correct.
Yes, absorption of the colored liquid-air bubbles is a bit too strong, what leads to black if r,g,b is substractive mixed.

My actual idea was always to share the scene as soon as I am confident with it. The scenes is close to be ready to be shared.
I will reduce the absorption and setup two or three particle systems ready to be simulated if has one enabled plugin ‚Molecular Script‘ in Blender user preferences.

Four colors liquid: The scene

Posted: Mon Apr 15, 2019 5:44 am
by FarbigeWelt
Few Bubbles in Reaction Tube.zip
Few Bubbles in Reaction Tube
(547.75 KiB) Downloaded 26 times
Change the amount of bubbles in each emitter to the value you wish.
Run the plugin 'Molecular Script' simulation and then render the image or the animation.