Hi, I have done several tests with the camera inside a sphere, following Enricocerica's advices.
I placed a 1 meter diameter sphere with normals pointing inside, at the camera's location, by copying the Pos value of the camera into a Placement node. I used a second placement node just between the sphere mesh/obj node and the placement node used for location, just for the sphere scale.
I noticed several interesting things :
- The fog is outside the sphere. So, by adjusting the sphere scale in Octane, you can adjust the distance where the fog starts to be visible.
- Adjusting the opacity of the sphere as well as the roughness allow interesting controls on fog density.
- Direct lighting seems to give better rays than Pathtracing, through trees for example.
- For my own, I used AO mode 3 with Diffuse Depth 2-3.
- Reflection 0.0.
- Transmission 1.0.
- Scattering direction is -0.5 on every image.
You may notice some unexpected artifacts on right and left sides of image RangerStation_136.jpg, for example. I tried with Smooth disabled on the sphere, and these artifacts disappeared ! See image RangerStation_137.jpg.
So, Smooth mustn't be used on the sphere !
I also noticed that Pathtracing and PMC kernels almost remove the blue color when the fog is strong.
High grain with Pathtracing and PMC is due to fast render (around 100 samples only).
Don't forget to disconnect the Sphere node to make the point with the focus pointer, otherwize you will be blocked by the sphere surface if your focus point is outside the sphere !
Foggy morning - Fog Tests
Forum rules
Important notice: All artwork submitted on our public gallery forums gallery forums may or may not be used by OTOY for publication on our website gallery.
If you do not want us to publish your art, please mention it in your post clearly. (put a very red small diagonal cross in the top left corner of the image)
Any images already published on the gallery will be removed if the original author asks us to do so.
We recommend placing your credits on the images so you benefit from the exposure too, and use a minimum image width of 1200 pixels, and pathtracing or PMC. Thanks for your attention, The OctaneRender Team.
For new users: this forum is moderated. Your first post will appear only after it has been reviewed by a moderator, so it will not show up immediately.
This is necessary to avoid this forum being flooded by spam.
Important notice: All artwork submitted on our public gallery forums gallery forums may or may not be used by OTOY for publication on our website gallery.
If you do not want us to publish your art, please mention it in your post clearly. (put a very red small diagonal cross in the top left corner of the image)
Any images already published on the gallery will be removed if the original author asks us to do so.
We recommend placing your credits on the images so you benefit from the exposure too, and use a minimum image width of 1200 pixels, and pathtracing or PMC. Thanks for your attention, The OctaneRender Team.
For new users: this forum is moderated. Your first post will appear only after it has been reviewed by a moderator, so it will not show up immediately.
This is necessary to avoid this forum being flooded by spam.
- Attachments
-
- Direct Lighting - Sphere scale 20 - Scatter 0.05 - Scale 0.5 - Sphere opacity 1.0 - NO SMOOTH.
-
- Path Tracing - Sphere Scale 20 -Scattering 0.047 - Scale 0.5. - Sphere Opacity 1.0 -
-
- Direct Lighting - Sphere scale 50 - Scatter 0.5 - Scale 0.5 - Sphere opacity 0.8 - NO SMOOTH.
-
- Direct Lighting - Sphere scale 50 - Scatter 0.5 - Scale 0.5 - Sphere opacity 0.8 - SMOOTH.
-
- Direct Lighting - Sphere scale 150 - Scatter 0.5 - Scale 0.5 - Sphere opacity 0.8
-
- Path Tracing -Sphere scale 150
-
- Path Tracing -Sphere scale 300
-
- Direct Lighting - Sphere scale 1 - Very low scatter and scale (0.15-0.15)
-
- Direct Lighting - Sphere scale 1 - Very low scatter and scale (0.15-0.15)
French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.
-
p3taoctane
- Posts: 1418
- Joined: Mon Jan 25, 2010 12:53 am
Bloom'n fantastic Roubal
Would you mind sharing a screen shot of your Octane Render node structure.
I have tried doing this camera in a sphere and am getting mixed results. I think my scale is wrong.
Nice job... some of the fog looks like snow.. well done!!
Peter
Would you mind sharing a screen shot of your Octane Render node structure.
I have tried doing this camera in a sphere and am getting mixed results. I think my scale is wrong.
Nice job... some of the fog looks like snow.. well done!!
Peter
Windows 7 Pro_SP 1_64 bit_48 GB Ram_Intel Xeon X5660 2.80 GHZ x2_6 580GTX_1 Quadra 4800
@ p3taoctane : I am not on my workstation, so I can't do a screen shot right now, and I don't know if I will have time tomorrow. So, I give you a simulated image made in Photoshop Elements.
- Attachments
-
- Sphere placement for fog, in Octane.
French Blender user - CPU : intel Quad QX9650 at 3GHz - 8GB of RAM - Windows 7 Pro 64 bits. Display GPU : GeForce GTX 480 (2 Samsung 2443BW-1920x1600 monitors). External GPUs : two EVGA GTX 580 3GB in a Cubix GPU-Xpander Pro 2. NVidia Driver : 368.22.
-
p3taoctane
- Posts: 1418
- Joined: Mon Jan 25, 2010 12:53 am
Thanks mate
I like the two placement nodes... one for scale and one for placement.... great idea
Peter
I like the two placement nodes... one for scale and one for placement.... great idea
Peter
Windows 7 Pro_SP 1_64 bit_48 GB Ram_Intel Xeon X5660 2.80 GHZ x2_6 580GTX_1 Quadra 4800
Great job thanks for sharing
Win 11 64GB | NVIDIA RTX3060 12GB
-
r-username
- Posts: 217
- Joined: Thu Nov 24, 2011 3:39 pm
thanks for sharing your learnings.
-
teecee2107
- Posts: 210
- Joined: Thu Oct 28, 2010 6:45 pm
- Location: Liège - Belgium
Very useful, thanks for sharing !
Core 2 Quad Q9400 | 8Gb | Zotac 580 GTX 3 Gb | Windows 7 64bits | Octane 1.11 | Nvidia Driver 310.70