Sun Problem

Kevin F · August 06, 2016, 05:52:46 AM

Does anyone know why the sun in this clip is in front of the clouds? I've tried and tried to get the clouds to partially obscure the sun but without success. All values are "normal" i.e. sun strength 4, redsky decay 8 etc. using TG4 beta with just one easy cloud layer of Altocumulus Castellanus.

Or is this just an artifact of having "visible disc" enabled. I never normally have this option on, I have presumed that positioning the sun behind clouds would obscure it. I would have thought you could have visible disc selected and have clouds covering part of the face of the sun (as in real life!). see eg. pic from photo.

Kevin F · August 06, 2016, 07:29:17 AM

I'm an idiot!
I had Defer amto/clouds enabled.

please ignore me, I'll go away!

AP · August 06, 2016, 07:36:22 AM

Using your settings and had Defer atmo/cloud on and this is the result.

Kevin F · August 06, 2016, 09:08:08 AM

Thanks AP! Guess this means I'm not an idiot?
Back to the problem then. $:-\$

Oshyan · August 06, 2016, 03:57:48 PM

Turn off Visible Disc.

- Oshyan

Kevin F · August 06, 2016, 04:30:27 PM

But I want a visible disc!

Quote from: Oshyan on August 06, 2016, 03:57:48 PM
Turn off Visible Disc.

- Oshyan

Oshyan · August 06, 2016, 04:38:33 PM

Evidently you don't because it's behind clouds.

Have you tried it?

- Oshyan

Kevin F · August 06, 2016, 05:58:14 PM

yes I've tried it.
What I want is in the original post as eg.
i.e. A visible sun partially covered by cloud.
I have a working version now anyway which I'm working on.
Thanks

icarus51 · August 10, 2016, 07:55:04 AM

Hi Kevin F,

I tried this issue and i have obtained this:

This is a crop of the full render. I hope the image is visibile.

No post process, no Photoshop or other graphic editor. Simple render by Terragen 4 BETA
The full render is big and lenghty but if you want to try is in attachment below.

Some parameters used.

Defer Atmo/clouds: Off (i don't know the reason but if you check this the Sun disc is visible through the clouds).
Visible disc: On
Cloud density: 0.85
Edges Sharpening: 23.8
Parameter C: 0.25
Sun disc size: 1.44°
Render quality: 0.45
AA: 3

I hope this helps.

Greetings.
Claudio

Ps: If sun results partially visible through Cloud you play with Parameter C and Light transmission in Clouds tab.
I used the RTP also.

Kevin F · August 10, 2016, 08:33:57 AM

Thanks for this Claudio,
I managed to get it to work anyway.
see - http://www.planetside.co.uk/forums/index.php/topic,21944.msg220670.html#msg220670

My problem was that I had tweaked the atmosphere settings to levels that were giving the "wrong" results. I reset everything to default settings and it worked!

It did highlight the need however, for a quick method to return to default values for shaders and other variables (like the atmosphere tab" that have numerous parts all with variable values. The tweaks panel in the atmosphere tab has a "Reset Tweaks" option, for example and I think it would be a good idea to have this in more places.

Thanks for your input.

icarus51 · August 10, 2016, 08:48:26 AM

Hi Kevin,

Happy for you. I also think that Reset to Default would be useful in many situations.

Claudio

Ps: About the lines on water i found that if you move the camera laterally until the lines become oblique to the line of sight the same disappear.
Sometimes also the lines of the boundary of the horizontal water can be seen on the sea, in this case moving the camera higher up or expand the radius of the water to the Infinite or vary the roughness of sea. Via post process then you can delete any problems.
Test it.