Questions tagged [volumetrics]

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

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Import Mantaflow VDB Cache Files into Bleder doesn´t work correctly

I made a Smoke Simulation with Mantaflow and then tried to import the vdb files from the data folder in the cache folder, but the imported vdb sequence doesn´t look the same. It looks simplistic and ...
1 vote
0 answers
39 views

I am having problems with VDB volumes that intersect, it just leaves random patches that look like the volumes aren't there

So I did a smoke simulation in Houdini, exported i and imported it into blend and I need to place it six times around 1 point but for some reason the places the volumes intesect have random patches ...
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0 answers
52 views

Weird Volumetric Lighting Issue with Emissive Texture

I'm using a couple of emissive textures to light a scene, and I added a cube (volume scatter) for volumetrics. Before scaling everything up, the volumetrics looked fine. However, now I'm getting this ...
0 votes
1 answer
1k views

Artifacts in cycles clouds and volumetric atmosphere

I am shading a planet, made up of three ico spheres, one for the planet itself, one for the clouds, and one for the atmosphere. However, the cloud layer is introducing this weird band/artifact on the ...
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Strange artifacts when using Volume Scatter + Volume Absorption

I always get these streaks (on cork and left side of this render too) when using volume scatter with volume absorption, they start happening during the render process and it's glowing because I have a ...
5 votes
1 answer
3k views

Principled Volume VS. Volume Scatter VS. Volume Absorption - Key Differences, how they affect the scene and when to use them?

So recently I've been experimenting with an underwater scene in blender and came across a few options for creating the volumetric. I usually go around applying one of the three shaders and see which ...
3 votes
4 answers
9k views

Blender EEVEE not rendering smoke simulation

For some reason the EEVEE viewport is actually rendering the smoke simulation, however, on the actual render, it does not seem to render it at all as if it's excluding it. I have checked Volumetrics ...
3 votes
2 answers
232 views

Voxel Data Animation Issue

Original Question: I am trying to render a time voxel data set. I have my 8 bit RAW file, with time series as still frames. I am using BI rendering, as voxels aren't supported in Cycles yet. When I ...
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0 answers
193 views

Volume godrays way too noisy

I've been trying to make godrays but they take a lot of samples in my scene. It's an interior and I wanted to have some god rays from the windows, I know volumetrics are expensive, but is there a way ...
0 votes
1 answer
279 views

Making volume clouds sharper

I am creating a nebula-like environment. This is my workflow: I create a simple mesh with displace modifier applied to it. I then create a volume empty, apply mesh to volume modifier to it using the ...
0 votes
1 answer
444 views

How to ease the edges of a volumetric texture?

I have a volumetric texture, and I don't know how I can ease the edges of this texture, to rub the "cube shape" of the volumetric texture. I also need this to be keyframed. I tried to use ...
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23 views

Volumetric effects not working

I have a black hole, and the accretion disk is a volumetric, however when I added noise to the density there wasn't any result. This is what I want: vs what I have: This is my node setup:
3 votes
0 answers
265 views

Lighting a volume with a bi-color point light (2)

This question is a following of this one I would like to light the center of a cylindric volume with a gradient light White -> Red -> Blue radially from the center to the border. I made a test of ...
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519 views

Blocky VDB artefacts when combine with principle volume?

I notice when i have a VDB volumetric sequence inside a standard blender principle volume setup, this renders with large blocky artefacts that only appear when the principle volume is enabled. Ie if i ...
1 vote
0 answers
83 views

Rendering a volumetric material in cycles causes a full system crash [closed]

before I get to the details of my problem, I should probably make a few things clear Firstly, I am not a regular Blender user. I'm not completely new to Blender, but I don't have much experience with ...
1 vote
1 answer
199 views

Principled Volume Shader shows edges of its Domain/Object

When I use a material comprised of a Principled Volume shader on an object used as the volume domain, I see the outline of the object/domain. Is there a way to "pad" the edges of the domain ...
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0 answers
67 views

Volumetric cloud not responding to emissive body

Hi I am trying to make an effect of the cloud being lit up by the emissive object, but it doesn't seem to be responding to the light whatsoever. If there anything that i need to toggle on or sth? ...
1 vote
0 answers
52 views

How to I get this type of mesh in Blender?

I created this mesh in Cinema 4d, making use of Shader field and volume mesher: I am trying to recreate this type of mesh "(liquid)" in Blender. I first try by using geometry nodes, by ...
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133 views

EEVEE - make shadeless "image as plane" not effected by volumetrics and bloom like "grease pencil"

I'm making an environment that mixes 2D images and 3D objects. I want to give it a cartoon-ish look with uniform line art around each object. For the 2D images, I created the lineart in Photoshop, ...
1 vote
0 answers
59 views

Volumetric / Atmosphere Cutoff Problem

I am rendering a landscape scene with realistic scale values (about 6000 meters) in cycles. I need a very fine atmospheric effect, but below a certain density value the volumetric shader abruptly cuts ...
1 vote
1 answer
249 views

Volumetrics and why mine is not working so well

So I have a light that is shining through some Gobos behind my sword. Now the problem is the cubes are not really blocking the light enough to provide nice effect. Why would this be ? I am new to ...
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0 answers
17 views

Volumetric Shade coming out ultra low resolusion [duplicate]

any ideas why my Volumetric shader is doing this to the monkey? Thanks a lot :)!
0 votes
1 answer
314 views

Get cryptomatte for volume objects

How can I get a cryptomatte or another form of mask for an volume object in Blender? All volume objects are just missing from the cryptomatte and aren't selectable in the compositor using the ...
2 votes
0 answers
35 views

Set specific values for ray visibility on lights

In other software (houdini, 3ds max) there is a way to set lights to have specific Ray multiplier values. For example having diffuse at 1.0 but volume scatter at 15.0. This would make its volume ...
1 vote
3 answers
422 views

Principled volume material renders incorrectly when exported as PNG with alpha channel

I made a very simple volume object to create an atmosphere for my scene, however, when I save the render, all the color is gone from the volume. Also the alpha of the image is wrong. I tried to ...
0 votes
1 answer
75 views

Activating bounding box for a volumetrics

is there a way to make volumetrics a basic bounding box in solid view mode? it keeps blocking out all the other objects in my scene so i always need to keep turning off and when when i need to access ...
2 votes
0 answers
150 views

Grease pencil is showing through objects when I turn on volumetrics

This is with volumetrics on, you can see little pixels of the grease pencil bleeding through objects in the foreground. This is with volumetrics off, here you can see the grease pencil is displaying ...
2 votes
1 answer
95 views

Geometry Nodes: Color gradient on moving instanced volume

I'm trying to get a candle flame to be colored with a gradient. My problem is that the candle flame move as the candle melt. Everything is made in Geometry Nodes. And the flame is a volume. And so I ...
0 votes
1 answer
166 views

How can we create this gold nanoparticles structure? [duplicate]

How can we create the molecular structure (AuNPs) below? Using a volume cube can be a solution but I couldn't achieve it properly. Kindly help
3 votes
0 answers
185 views

How can I create custom texture coordinates for a volume?

My ultimate goal: I’d like to create procedural cirrus clouds (long, thin, feathery high altitude clouds), ideally shaped fairly directly, e.g. with a curve. There are some very good procedural cloud ...
1 vote
0 answers
187 views

Why Is My Volume Emission So Blocky?

Can someone explain to me what is happening here and how to get around it? I have a volume object (cloud) that I want to give a soft glow. However the glow is very blocky, yet the mesh that the ...
1 vote
1 answer
70 views

Eevee spot light volumetric lighting not starting or stopping at right location

I'm trying to have a spot light in a dark room with volumetric lighting in Eevee. The trouble is the cone of light starts past where it should and stops before it should. Below is the first example. ...
2 votes
1 answer
1k views

Fastest way to make a fog gradient?

I need to do a fog that's dense at the bottom and gradually disappears to the top of the box. I adjusted a gradient texture with mapping, but is there a more straighforward way?
0 votes
1 answer
382 views

Shading Imported VDB to look more like Embergen Shading

This may not be the right forum. But I was wondering if someone knew a good node set up for shading a VDB simulation to have "translucency" like it has in Embergen. this is kinda what I'm ...
1 vote
0 answers
59 views

I'm looking to make a volumetric material only show up when Light hits it

I've done this with a Principled BSDF to make a light cycle on my earth scene, and I want to do the same with the volumetric atmosphere, but it doesn't seem to work with volume the same way a material ...
2 votes
1 answer
545 views

Cycles Volume Scattering with Voxel Data

Problem I am trying to visualize the electron density of some simulations. The data would consist of a file with the density of electrons at each point in space. From reading documentation I have ...
3 votes
1 answer
1k views

Voxel Data texture in Blender (Especially for Cycles/EEVEE)

What I'm up to? I would like to render some CT/MRI data. The data is represented as a 3d array with float values. (Or a sequence of 2d images) My scheme As the blender manual describes, procedual ...
16 votes
3 answers
4k 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 ...
2 votes
0 answers
249 views

How can I load OpenVDB files with correct scaling and translation

Dear Blender community, I have been trying to use Blender to visualize molecules and volumetric data from molecular dynamics simulation. I managed to save my data in OpenVDB format using the pyopenvdb ...
1 vote
1 answer
111 views

Liquid material shading problem

I am beginner with blender and I'm currently trying to create some liquid (coffee for example) inside a cup. The cup is not a problem, shading of the liquid is. I've tried to follow few tutorials on ...
4 votes
1 answer
780 views

How make clouds less square?

I am trying to create clouds using cycles, but they are looking too squared. I am using volume and the modifiers are: The mesh I am using is a simple meatball. How can I create clouds with more ...
4 votes
3 answers
1k views

Soften/Feather Edge of 3D Sphere (Cycles)

How can I soften the edge of a 3D Sphere? Using Volume? I've tried searching for the answer but I can't find a way to completely soften the edge. I'm using Cycles. Any help is greatly appreciated! (...
1 vote
1 answer
440 views

How do you achieve volumetric fall-off, inside a cylinder?

It is a cyl with volume inside it. I want to have this fog fade away from bottom to top. I have tried using separate XYZ as previously suggested - this is what happened and it is not what im wanting: ...
4 votes
3 answers
2k views

Volumetrics in EEVEE working in viewport but not in final render

Hey so I'm working on a scene with volumetrics enabled in the Eevee render setting (volumetric lightning is on as well). It shows up in the viewport and it looks fantastic, but as soon as I press F12 ...
0 votes
0 answers
57 views

Bounding object with volumes casts shadows and causes artifacts

I'm making a scene and bounding boxes with volumes in them cast their own shadows instead of the volume shadows. I've tried setting "Shadow mode" to None, but it doesn't change anything. I'm ...
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0 answers
117 views

How to vary the density of instances within a mesh volume in geo nodes

What I want is to alter the 'density' of instances within a mesh volume, I don't believe there's a way to directly do this, but I'm instead attempting to translate the instances to mimic the effect. ...
0 votes
0 answers
276 views

Imported VDB Fire Simulation Isn't Rendering on Transparent Background

I have this render of a fire simulation I made in Embergen. When I would render out the animation on a transparent background, everything would be fine until when it would save the final frame to my ...
0 votes
0 answers
324 views

How to fake a volume when you can't use volume? GLB export only supports meshes

I want a cube exported to a GLB file to look like a volume. Think "smoke," not "hard-edged box." Sadly, GLB format only supports meshes --> hard-edged boxes. So how might I fake ...
0 votes
1 answer
275 views

Volume Scatter doesn't seem to change density

I've been staring at this for a while now, testing densities and changing settings on. Feeling like the answer is right in front of me. 3.0.1 - Cycles
1 vote
1 answer
195 views

Rendering an underwater scene - with depth fall off and surface caustics

I've been working on an underwater scene for a project and now reached a standstill due to an issue that I encountered. I'm trying to render a scene such as the ones in the images below, I tried using ...

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