Questions tagged [volumetrics]

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

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25
votes
2answers
16k views

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-...
20
votes
2answers
2k 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 ...
19
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4answers
27k 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 ...
18
votes
1answer
11k 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 ...
15
votes
1answer
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 ...
15
votes
1answer
7k 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. ...
15
votes
3answers
6k 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 ...
14
votes
2answers
2k 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 ...
14
votes
1answer
2k 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 ...
13
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2answers
16k 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 ...
12
votes
1answer
3k 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 ...
12
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1answer
1k 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 ...
11
votes
1answer
2k 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 ...
11
votes
4answers
3k 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, ...
10
votes
1answer
940 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 ...
10
votes
1answer
818 views

How can I correct this beer material?

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 ...
9
votes
4answers
2k 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 ...
9
votes
1answer
3k 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" ...
9
votes
1answer
8k 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.
9
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2answers
3k 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 more or ...
9
votes
1answer
701 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 ...
9
votes
2answers
10k 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 ...
9
votes
1answer
282 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 "
8
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2answers
1k 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 ...
8
votes
4answers
4k 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 ...
8
votes
1answer
4k 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 ...
8
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3answers
3k 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.
8
votes
1answer
3k 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 ...
8
votes
3answers
1k 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 ...
8
votes
1answer
311 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 ...
8
votes
1answer
3k 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 ...
7
votes
1answer
9k 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 ...
7
votes
1answer
6k 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 ...
7
votes
1answer
940 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 ...
7
votes
1answer
536 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 ...
7
votes
2answers
2k 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.
7
votes
1answer
732 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 ...
7
votes
1answer
1k views

How to make a good glow effect around a sun?

I am trying to figure out how to make the space around the sun glow and than fade away into darkness. The sun was made in blender using cycles render and several noise textures. The glow I have ...
7
votes
1answer
654 views

How can I render Volume Scattering on all my layers?

I have an interior scene in witch I want to have atmospheric falloff (dust effect). I've created an object that contains my room and I gave it a volume scatter shader (I'm working in Cycles). The ...
7
votes
1answer
184 views

Is there a way to determine if a ray is coming from a volume?

I am trying to create a light that only illuminates volume scatters. The input > light path node has "is X ray" outputs for all the various types of rays coming off a surface. However I'd like ...
7
votes
2answers
503 views

3d Volume from 2d Texture

is it somehow possible to generate volumetric information from a 2D Image Texture? I experimented already quite a bit, but with no succes. I thought about using the RGB, or better said, the BW-...
7
votes
1answer
820 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 ...
7
votes
1answer
999 views

Mulitple point density clouds - intersecting each other

for an animation I want to create a fluffy cloud scenery (with the internal render engine) To to this, I created severeal cloud shaped meshes- each of them got a particle system. Over that I build a ...
6
votes
3answers
8k 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 ...
6
votes
1answer
2k views

How can I change the particles density and its direction in volume?

I'd like to have the number of particles greater in the bottom , and they get lower towards the upper parts of the cube, it's because I don't want them to spread homogenously. How can I make it I have ...
6
votes
2answers
2k 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 (...
6
votes
1answer
3k views

Where is the Volume “step size” in Blender 2.78?

I'm trying to adjust volume step size for accuracy in Blender, but cannot find the "Volume Sampling" section in the newest version, 2.78. For reference, here's what I'm referring to: It seems to not ...
6
votes
1answer
4k views

Volumetric Spot Light with Cycles

I'm using blender 2.76 rc1 with an AMD Raedon HD 7900 series, I'd like to create a volumetric spot light with cycles render. I set the volume scatter (density 0.1) in volume and mist pass in world, ...
6
votes
1answer
289 views

Cycles: Generate 3d coordinates before modifier stack is resolved

Im trying to create a volumetric material that uses a 3d texture. I need this volumetric to be animated along a curve. Right now, I have the material using generated coordinates. But the 3d texture ...
6
votes
1answer
1k views

Volume scatter shader causes black spots

I am following Andrew price's video on making clouds but my clouds are rendering with black spots on them. I have tried turning up the maximum transparency value under light paths but there is no ...