Author Topic: Hollow Cloud Possible?  (Read 166 times)

Offline WASasquatch

  • Member
  • *
  • Posts: 1790
  • to = ( be ) ? be : not;
Hollow Cloud Possible?
« on: April 12, 2018, 03:37:03 AM »
Like the tittle suggests. Is this possible?
Art can be a window into the soul

Offline cyphyr

  • Terragen Alpha Tester (Win)
  • ***
  • Posts: 3802
    • richardfraser
Re: Hollow Cloud Possible?
« Reply #1 on: April 12, 2018, 03:48:10 AM »
A distance shader attached to a camera will give you a spherical void. and there are some blue function nodes that could be leveraged ... Bit of a challenge though.
www.richardfraser.co.uk
https://www.facebook.com/RichardFraserVFX/
/|\

i7 5930 @3.5Ghz, 32Gb
i7 2600k @3.4Ghz, 16Gb
i7 980 @3.33Ghz, 16Gb

Offline Oshyan

  • Planetside Staff
  • *
  • Posts: 12225
  • Holy snagging ducks!
Re: Hollow Cloud Possible?
« Reply #2 on: April 12, 2018, 05:24:45 AM »
A Distance Shader as the Mask for your Density Shader (or Final Density Modulator) should work fine, although it would only create a spherical "hollow" inside the cloud, not one the exact shape of the exterior but shrunken, so to speak. But what exactly are you wanting to achieve? If you're in the center of a hollow cloud you'll just see... gray around you, right? And if you're seeing it from the outside, you wouldn't even know it's hollow, except maybe by odd lighting interactions, right?

- Oshyan

Offline WASasquatch

  • Member
  • *
  • Posts: 1790
  • to = ( be ) ? be : not;
Re: Hollow Cloud Possible?
« Reply #3 on: April 12, 2018, 06:30:36 AM »
A Distance Shader as the Mask for your Density Shader (or Final Density Modulator) should work fine, although it would only create a spherical "hollow" inside the cloud, not one the exact shape of the exterior but shrunken, so to speak. But what exactly are you wanting to achieve? If you're in the center of a hollow cloud you'll just see... gray around you, right? And if you're seeing it from the outside, you wouldn't even know it's hollow, except maybe by odd lighting interactions, right?

- Oshyan

Basically I think the problem I am having with lighting in my galaxies is when I create my galactic core, there are tiny cloud "particles" right near the actual light source; creating shadows/effecting light scattering, that casts out, growing exponentially due to closeness to the light source.  And this ruins the appearance of the scene. I have to ramp down density until the effect I want is lost, also.


*Twiddle thumbs waiting on a preview render example...*

These artifacts don't exist if there is no galactic core (that is an example, I deleted the original two sided depth one), and the clouds creating haze are a solid colour and do not use a PF to create shape. Usually this "core" would have a PF shape (not just base density with max coverage), which is larger scale and like water caustics, almost like a sun but more dense clouds.
« Last Edit: April 12, 2018, 06:33:08 AM by WASasquatch »
Art can be a window into the soul

 

anything