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Questions tagged [volumetrics]

Questions about rendering with volumes (smoke, fog, etc.). Use this tag for both Blender Internal and Cycles.

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27 votes
2 answers
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How to Create Dust Floating in the Air?

Quite impressed by all of Gleb Alexandrov's scenes with some amazing dust floating around. (To see what I'm talking about > http://www.creativeshrimp.com/lighting-tutorial-atmospheric-effects-dust-...
meed96's user avatar
  • 1,989
25 votes
2 answers
3k views

Volumetric Windows 10 logo effect

I'm trying to recreate the windows 10 background effect on a logo I've made in blender. Half the logo has a glass like material, the other half has a steel like material. And I'm using cycles at the ...
Des Horsley's user avatar
20 votes
4 answers
32k views

Rendering smoke in Cycles?

I am trying to render smoke in cycles, but the relevant blender manual page is designed for Bender Internal. I have everything set up except for the material. I imagine you would set up the material ...
Stephen's user avatar
  • 5,719
20 votes
2 answers
5k views

Distance from the surface as an input node for use with volumetric materials

I would like to create a material that has a volumetric component whose local Density depends on the depth of each volume point below the surface. Can the information "how deep below the surface is ...
Nicola Sap's user avatar
  • 12.9k
19 votes
1 answer
14k views

Using volumetrics in Cycles I have to have the light strength super high

I have to have a spot lamp strength VERY VERY high to have these light rays come through 300000.0 and look good. Sounds crazy doesn't it. Maybe it doesn't matter but it doesn't feel right. Will I ...
yodamon's user avatar
  • 895
19 votes
1 answer
8k views

Correct way to render crepuscular rays in cycles?

While trying to use the new cycles volumetric rending features to create crepuscular rays (with the intention of updating my answer here), I have found this to be a little trickier than I anticipated. ...
gandalf3's user avatar
  • 158k
18 votes
4 answers
5k views

Voxel data in Cycles

Is Cycles able to render voxel data from an external file? I can create the volumetric effects that I'm interested in by plugging a texture node into volume absorption and volume scatter shaders, ...
ajwood's user avatar
  • 10.1k
16 votes
3 answers
5k views

Using image sequence of medical scans as volume data in cycles

I know it's possible to do this in BI, but I need your help to do this in cycles. For now, I have a setup to use an image sequence as volume but it only shows 1 slice/frame. I'm using generated ...
Bithur's user avatar
  • 8,284
16 votes
3 answers
10k views

How to properly render smoke on a transparent background?

When rendering volumes with Film > Transparent enabled, the alpha appears to be the wrong type (premultiplied/straight). In the 3D view it works as expected: This is a known bug. Is there any way to ...
gandalf3's user avatar
  • 158k
15 votes
1 answer
2k views

Volume Gods rays are not well defined

I have a simple scene. Added an icosphere and emission to it. Set the volume scatter nodes. I can't find the rays coming out. Just at the fog and there's no clear light coming out. What setting am I ...
atek's user avatar
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15 votes
2 answers
24k views

Is there an easy way to make volumetric clouds for Cycles?

I'm working on an animation that takes place on a plane. I'd love to include the big detail of clouds moving past through the windows, but I'm using Cycles. I have no experience with the particle ...
user avatar
15 votes
1 answer
5k views

How to: Exponential Fall Off for Volume Density?

I'm trying to create a photorealistic Earth Atmosphere. Several papers written on the topic of atmospheric scattering state that our atmosphere's density has an exponential fall off, with most of it ...
CPLTarun's user avatar
  • 327
14 votes
2 answers
5k views

Create procedural spiral pattern

I'm trying to make a galaxy in blender. If I use an image of a galaxy to get the spiral shape it becomes a 2d image projected into the 3d volume. To avoid this I wanted to use a procedural method, but ...
Sudoadmin's user avatar
  • 163
14 votes
1 answer
6k views

Render semi-transparent volume with cycles

I want to render an image of a fire in cycles, but as a png with a transparent background. Without a transparent background, the output image looks like this: But as soon as I tick the "Transparent" ...
Isa's user avatar
  • 243
13 votes
1 answer
2k views

Is it possible to change the IOR inside a volume?

For instance, is it possible to simulate effects such as heat haze or other kinds of mirages which are caused by air with differing/changing refractive indexes? Plugging a procedural texture into the ...
gandalf3's user avatar
  • 158k
12 votes
4 answers
7k views

Emission: Red glow while the object itself is white

I want to make something like this in Blender: So I created a Torus and I created two emission materials for it (one for the right side and one for the left side) with two different colors and ...
HF_'s user avatar
  • 480
12 votes
1 answer
5k views

Create a gradient effect, like for coffee?

I'm trying to create a nice little mug with some coffee in it: I can't quite figure out how to describe the issue, but I guess the coffee looks too dense. There's usually a gradient falloff effect on ...
Josh Silveous's user avatar
12 votes
1 answer
2k views

Why is this transparent material rendering black?

I have a beer setup in my blender scene. It's a basic glass shader for the glass containing a fluid mesh with a glass + volume absorption material with a tint. I don't understand why the fluid is ...
Cubit's user avatar
  • 761
12 votes
2 answers
2k views

Is there any way to convert generated volumetric shader into the mesh?

Now that we've got Volume to Mesh modifier - which is so cool - we can make meshes from the simulations, like Open VDB sequences, etc. But it seems that it doesn't work with procedurally generated ...
Andrey Sokolov's user avatar
11 votes
4 answers
10k views

How to make Volumetric Scatter fade adjustable

In Cycles, I'd like to create a misty torus. Create torus, Volume Scatter note into the Volume Material Output node. Done. But I'd like to be able to adjust the density of the scatter with respect to ...
OroNZ's user avatar
  • 1,217
11 votes
1 answer
19k views

How to do volumetric lighting for a forest scene?

I have scene that looks like this: And I want to add volumetric lighting to it so that light forms a rays of light when it go through the trees like on this example that I found in youtube: But the ...
Dead By Deathweed's user avatar
11 votes
4 answers
5k views

How to create a hologram projection with light rays?

I am attempting to make a template for holographic effects in blender for a project I'm working on, however I'm not sure how to create a lighting effect for the projection of the hologram (The god ...
Sookendestroy's user avatar
11 votes
1 answer
2k views

Procedural volumetric texture generated from a script

I need to render a 3D density plot of custom mathematical functions as part of a scientific visualization. I've seen some demos and it seems that Blender is capable of volumetric rendering. My ...
BarbaraKwarc's user avatar
11 votes
4 answers
29k views

Domain boxes show up in cycles render

So I recently made the switch to cycles rendering and smoke modifiers, but it's been giving me loads of problems already. This is what the model looks like: And then when I go to render it, this is ...
Gh0stRunner's user avatar
10 votes
1 answer
5k views

Question about volume samples

I just want to know if I am understanding this correctly. Lets pretend my domain is 18 vox wide, if I want Cycles to render all the way through, do I need to set the volume samples to 18? Below I ...
icYou520's user avatar
  • 5,489
10 votes
3 answers
2k views

How to achieve white "fog" effect within an ice cube?

I modelled a set of ice cubes. I'm content with the result, but when I look at an actual ice cube from my fridge, it has a white foggy cloud within, like a microstructure. I'm trying to recreate that ...
Aardo's user avatar
  • 1,582
10 votes
1 answer
4k views

Create light rays in Cycles [duplicate]

I am trying to create something like volumetrics with a falloff: beams of light that shine visibly into the air from an emissive object, becoming gradually less visible as they get farther from the ...
PythonNut's user avatar
  • 242
10 votes
2 answers
8k views

How to create fire materials using the new Principled Volume node that visually look the same as the "old method" of fire materials?

There is a new volumetric shader node called "Principled Volume" in Blender 2.79 as of this commit. It appears to support a new temperature attribute, using blackbody temperature. Using the ...
Timaroberts's user avatar
  • 12.4k
10 votes
1 answer
2k views

Visualizing 3D voxel data in Blender 2.8

right now I'm trying to visualize my scientific 3D data in Blender 2.8. So blenders built in textures or smoke simulations do not lead to the goal. I've read that older releases of Blender do support ...
JnkBrnzn's user avatar
  • 141
9 votes
1 answer
18k views

Atmospheric lighting in cycles

How would I go a about making volume light beams? I have have tried various tutorials, but they must be for a older version. as applying them does seemingly nothing. A link to a functioning ...
a million little polygons's user avatar
9 votes
2 answers
2k views

Colours in OpenVDB volumes

*For more detailed information; see below I am working with (OpenVDB) volumes in Blender, which I use to create animations. This is an example: Both sides are different .vdb files. Now, I want to ...
Roy's user avatar
  • 85
9 votes
1 answer
9k views

cycles node setup for volumetric shader

I downloaded blender 2.7 to to do some volumetrics in cycles. How to set up material nodes because I have no idea, everything I do gives me a black diffuse.
Director78787's user avatar
9 votes
2 answers
15k views

Scattering and anisotropy usage

Apart from artistic purposes, what are some practical uses of negative, zero or positive anisotropy? I do understand how it affects the scattering direction but I am not sure when is it useful.
user40079's user avatar
  • 598
9 votes
1 answer
5k views

How to eliminate Cycles artifacts with many overlapping volumes?

I have encountered an issue with Cycles Volumetrics in a recent scene. I am using Blender 2.72, and both CPU and GPU render options. In both I get a solid black artifact when I have two volumes ...
J Sargent's user avatar
  • 19.3k
9 votes
3 answers
20k views

Atmospheric fog in Blender 2.8

I am a long time Blender user and I built some nice scenes with it. I also love the new 2.8 but ever since I was working with volumetrics in Blender I was never really happy with it. So what I want ...
Fabrice Magdanz's user avatar
9 votes
2 answers
12k views

How can I make a simple volumetric light on Cycles?

I'm trying to do a volumetric light on Cycles, and I've followed tutorials, but nothing has worked yet. How can I make a proper volumetric light in Blender, like the following one? But to leave the ...
beavoru's user avatar
  • 5,397
9 votes
1 answer
3k views

cycles volume rendering 3D image texture (CT or MR dataset)

Is it possible to render with cycles a 3D texture from discrete image data (eg. image sequence)? Basically I'm trying to get volume rendering of medical data with cycles.
xalpha's user avatar
  • 191
9 votes
1 answer
344 views

How to get the current step number in volume render

I need to get the current step number while rendering a volume object the step used for sampling the volume : something like in light path node " transparent depth , ray depth "
Chebhou's user avatar
  • 19.6k
8 votes
3 answers
19k views

Why doesn't Volumetric follow the shape of Mesh in Eevee?

So I was in the middle of making a ball-shaped smoke, but the volumetric effect didn't work following the basic shape. It remains cube in Eevee Blender 2.8; while in Cycle it works, but in Cycle it ...
Jodhy Satriawan's user avatar
8 votes
1 answer
13k views

Controlling volume density

How can I control the volume density values at different locations in a mesh with volume shaders? I know that noise textures can be plugged in to the density factor slot of a volume shader (producing ...
Qutorial's user avatar
  • 3,322
8 votes
2 answers
2k views

How to shift noise texture without distortion?

I am struggling with understanding how to shift the noise texture connected to another noise texture without distorting the overall shape. I have tried connecting them to same mapping, and to separate ...
Paul Pieless's user avatar
8 votes
3 answers
4k views

Volumetric Shading in Cycles

I understand that there is no proper way of doing volumetric shading in cycles yet, but I'm curious to know if there is a way to fake it. Effects such as clouds or fire.
Mellow Almas's user avatar
8 votes
1 answer
937 views

Render 3 dimensional scalar field

I have a function which assigns to "every" point in space (x,y,z) a scalar value d. I want to, somehow, visualize this function ...
VoidStar's user avatar
  • 297
8 votes
2 answers
1k views

How to create high altitude clouds? (cirrus and cirrocumulus)

Pretty much all cloud tutorials show how to make Cumulus clouds, or some random blob of a cloud, but I'm looking to create high altitude clouds, which you can see below. I'm most interested in the ...
Geri's user avatar
  • 1,363
8 votes
1 answer
540 views

Volumes with space-dependent light intensity

I would like to use Blender to render pictures of atomic orbitals like in the following picture or like in this video. This seems to need some light-emitting volume whose intensity is described by ...
Jjm's user avatar
  • 305
8 votes
1 answer
1k views

How to assign colors to Point Density based on data values?

I have a file containing approximately 900,000 x,y,z data points, each with a list of physical values at that position (temperature, density, chemical composition, etc.) I have written a Python ...
astrogeek's user avatar
  • 733
7 votes
3 answers
12k views

How can a light cone (volumetric) be setup with cycles?

I tried to reproduce the results from the Docs on volumetric lighting unfortunately the video link is broken. And I might have overlooked some related settings. The spot light is barley visible on ...
stacker's user avatar
  • 38.7k
7 votes
2 answers
3k views

Why does refraction + volume scatter cause a much darker result?

I've noticed that glass objects tend to turn really dark when adding volume scattering. It seems the volume scatter shader gives a much different result when a refraction shader is used in the ...
gandalf3's user avatar
  • 158k
7 votes
2 answers
4k views

How to make an object transparent to the freestyle pass?

In Blender 2.75a, I'm making a render using Cycles and the Freestyle pass. My scene contains a mesh with a smoke modifier that I'm rendering through a volumetric shader. The boundaries of this mesh (...
Nicola Sap's user avatar
  • 12.9k
7 votes
1 answer
2k views

Horizontal lines showing in volume scatter shader

I am creating a landscape scene, and to get clouds I scaled a cube by a lot in x/y directions and set its material as follows: A quick render resulted in the following pattern: It is possible to see ...
Mirac7's user avatar
  • 401

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