Atmosphere and dust particles
Alpha01
Posts: 160
Hi
I am wanting to add dust and atmosphere to my pictures, I have looked at the brushes and effects and am a bit unsure as to which one works best.
I would like to create a room with sun shining through a window, with visible dust particles.
Could someone please offer some guidance or provide a list of which is best to use for Daz 4.5 please.
Thank you for any help
Adrian
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Comments
Volumetrics is a difficult topic. There are ways to do it rendered into the scene, but all require a learning curve and all are subject to some problems. Learning to paint the effect into your image in post gives you the most control, but then you have to learn how to do that convincingly :)
'In Camera' solutions:
DS 4.5 Pro ships with Omnifreaker's volumetric shader. This is a shader you apply to a primitive (say a cone attached to a spotlight) which makes the volumetric effect at render. In the case of a room you'd probably want to make a big cube size it to slightly bigger than the room, and apply the shader to that.
The biggest gotcha with this method is that the camera _cannot_ be inside of the object with the volumetric shader or it won't render the effect.
The second biggest gotcha is that it does not handle transparency maps well. The transparent parts of things like hair and leaves will render with maximum volumetric effect. The consequences of this can range from subtle fringing to outright nasty depending on your scene.
Your other option is to buy "Atmospheric Effects Cameras for DAZ Studio." This provides you with a volumetric camera and full control over the effect, eliminating all of that wrangling of primitives and shaders. It is still subject to gotcha #2 with the transparencies, which can be quite limiting.
Personally I often use a hybrid solution wherein I use the camera to render my volumetric effect as a separate pass, then I hand paint corrections to any transparency issues and composite the volume pass back into the image. It's labor intensive but it works great.
Here's how:
Render your scene with a normal camera. Save that image.
Add a volumetric camera to your scene, copy your current normal camera and paste to the volumetric camera.
Switch to the volumetric camera, tweak and test render until you have the rays and stuff looking the way you want. Save the scene.
Select all of the materials in the scene and drop diffuse strength, specular strength and ambient strength to zero. Save this scene as a different (slightly modified) file name to avoid overwriting your previous scene.
Render this scene. All you will see is the volume effect and black.
Open the volume pass in Photoshop. Use the brush and clone tools to clean up the messy bits.
Open the original, non-volume render in Photoshop. copy the cleaned up volume render and paste it in a new layer over the original render. set the volume layer mode to 'screen.' Adjust opacity to taste.
Or you could just learn to paint the volume effect directly in Photoshop using your mad art skills. Unfortunately this option is not available to me so I cannot help you with it ;)
DAZ Studio does not have a 'particle' system as such, most people add these kind of effects in postwork, but there is a volumetric camera available which will do what you want inside DS using Ubervolume. You will find this under Shader Presets > omnifreaker > Ubervolume in DAZ Studio Formats in the Content Library.
There is a Help file icon for it too, which takes you here :
http://www.omnifreaker.com/index.php?title=UberVolume
Hi
Thanks for the replies.
I got the “Atmospheric Effects Cameras for DAZ Studio.” and have spent all day trying to get the right look.
But as soon as I try to advance the lightening and volume cone Daz either crashes or 3Ddelight fails to render.
Most I can do is the picture below, I just cant get it right. I think I will sleep on it and come back tomorrow with a fresh head.
It's really easy.
Create a new primitive cube and scale it up so that your scene is inside it. Now apply the UberVolume base to the primitive, then select the "Uber Volume dust" preset. Make sure your camera is outside the cube.
Now you have as much dust as you want (adjust the density etc in the surfaces tab until it's how you want it)
Cheers Sertorial
I have success now and my renders are looking right, I was having a stupid moment yesterday and using the cone in stead of sphere .
cheers
No prob.
If you have any view on this one, please reply
http://www.daz3d.com/forums/discussion/17730/P15/#284262