hi
in the following image you can see blue spill from the sky, which IMO, is far too strong, there is no haze in this scene (see attached)...I've goofed around with as many settings as I can and the only on that seems to have any effect on it is Atmosphere > Bluesky Density, but if I lower this the sky goes dark... ???
any advice woul dbe great
thanks
The atmosphere effects the color of the landscape. This is a distance effect. I would render the atmosphere separately, then render the landscape with the atmosphere turned off. This may fix the difficulty.
thanks, I understand the reason it's happening, and I do want the sky to tint the terrain - just not nearly as much - there doesn't seem to be a way to control this...
I want this:
(http://farm1.static.flickr.com/7/8634107_fec9aac92b.jpg)
rather than this:
(http://www.zakopane-life.com/media/pics/tatra-mountains-zakopane.jpg)
The issue we're talking about here is called Aerial Perspective see the Wikipedia entry for more http://en.wikipedia.org/wiki/Aerial_perspective (http://en.wikipedia.org/wiki/Aerial_perspective)
In mountainous environments the sky due to its high UV content tends to be dark any way and the snow tends to pick up the color of the sky, also the higher in altitude the darker the sky: an example would be the death zone of MT.Everest where the sky is as dark blue as you can get without turning black.
Terragen, I would suggest colors its terrain too much form what I have seen natural daylight, due to complex interactions between it the oxygen and ozone layers and atmospheric particulates (0.01 to 0.03mm in size) tends to fall off in gradually throughout the day with the ground getting gradualy dimmer, rather than an abrupt color cast as in Terragen.
Regards to you.
Cyber-Angel
Schmeerlap once suggested giving the snow some luminosity on one of my images. It canceled out the color I did not want.
What about changing the global illumination lighting or ambient lighting color to white, what ever one you may be using. If you are using any of them are they blue in color. Look in your lighting tab and see what is going on there.
Agreed, have you changed any of your lighting settings?
- Oshyan
Haha I had a kind of a little grin/laugh when reading this because you want to solve this issue where I want to have this in some of my renders I'm working on :)
First I also thought it's the hazes, but apparently it's the lighting.
I don't think it's the lighting...
the file I posted has this:
<enviro_light
name = "Enviro light"
gui_use_node_pos = "1"
gui_node_pos = "320 0 0"
gui_group = "Lighting"
enable = "0"
mode = "1"
ambient_strength_on_surfaces = "1"
ambient_colour_on_surfaces = "0.6499999762 0.8000000119 1"
ambient_strength_in_atmosphere = "1"
ambient_colour_in_atmosphere = "0.6499999762 0.8000000119 1"
global_strength_on_surfaces = "0"
global_tint_on_surfaces = "0 0 0"
global_strength_in_atmosphere = "0"
global_tint_in_atmosphere = "0 0 0"
strength_on_surfaces = "0"
colour_on_surfaces = "0 0 0"
strength_in_atmosphere = "0"
colour_in_atmosphere = "0 0 0"
>
</enviro_light>
<sunlight
name = "Sunlight 01"
gui_use_node_pos = "1"
gui_node_pos = "320 -60 0"
gui_group = "Lighting"
enable = "1"
heading = "300"
elevation = "25"
colour = "1 1 1"
strength = "3.5"
cast_shadows = "1"
shadows_of_surfaces = "1"
shadows_of_atmosphere = "1"
soft_shadows = "0"
soft_shadow_diameter = "0.5"
soft_shadow_samples = "9"
glow_in_atmosphere = "1"
specular_highlights = "1"
visible_disc = "1"
angular_diameter = "0.5"
>
</sunlight>
The mountains are affected by the atmosphere because they are in the distance. It's a question of scale. There are two ways you can try to reduce the atmospheric affect on the distant mountains with minimal change to the sky:
1) Reduce the scale of your terrain (this might be difficult)
or
2) Reduce atmosphere densities (bluesky density, haze density), and increase the scale of the atmosphere to compensate so that the sky remains similar. You can increase the scale of the atmosphere by increasing bluesky exp height and haze exp height.
Bluesky exp height and haze exp height control the rate of falloff with altitude. Doubling these values would result in doubling the density of sky if you were looking up at the zenith from a camera altitude of 0, so it's an effective way of separating the appearance of the sky from the appearance atmospheric effects on local features like mountains.
As a quick experiment try, multiplying your bluesky density and haze density values by 0.25 and multiplying your bluesky exp height and haze exp height values by 4. The sky should look reasonably similar to your original render as long as your camera altitude is not too far from 0.
(The 'blue sky' component and the 'haze' component both affect distant objects, just like they affect the black of space to give the sky colour.)
Matt
thanks Matt, I'll give that a try.
@matt
thanks this seems to work well....