Questions tagged [volumetrics]

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

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19 views

volume shader inside of a glass material

I am trying to create a scene of nebula trapped in a glass cube,I have sucessfully created nebula by using principled volume,however whenever I try to put a transsimisive cube around it,cycles ...
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Problem with volumetric lighting

I'm trying to replicate a problem I'm having in a scene I'm working on, simpler but the same issue. I have a scooter wheel with leds inside the wheel and a basic volumetric cube surrounding it. If I ...
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Adding Volumetic to a scene changes the alpha transparency around my vegetation

I've imported some vegetation from the "tree vegetation addon" Here's what it looks like When I add a volumetric cube (not to the world), to add some fog, It messes up the transparency ...
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how do i keep dense volumetric effects staying sharp, mine keep going fuzzy when i change unrelated parameters

i have a dense volumetric scatter (happens with absorption too) shader with very fine details that i want to keep sharp, it stays sharp when i connect the nodes but it goes fuzzy and different when ...
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27 views

Why do the clouds look blocky?

I imported vdb clouds into Blender and noticed in the viewport they looked very blocky. So I rendered it out and it looks like this. I tried changing the light path and volume settings but nothing ...
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Atmospheric falloff for volumetric materials?

I have a scene with volumetric clouds, and would like to have atmospheric falloff on them using the mist pass, however, as you'll see in this simplified scene, that didn't work. Here's the scene. As ...
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21 views

volumetrics not visible through glass / refraction

Cycles. I have a cube with a volumetric scattering shader in a room with ceiling lights. the volumetrics look good inside, but when viewed through a glass pane (principled bsdf with Transmission or ...
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1answer
32 views

Volumetrics not rendering/previewing in Cycles but working fine in Eevee [duplicate]

Hello Blender Stack Exchange! I seem to have a problem where my fog node setup doesn't display in the scene using Cycles engine (not working in 3D viewport nor in the final rendered image) but ...
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1answer
131 views

Cycles: Strange effect on glowing object

I have the arrow with glowing shader. Rendered by cycles it looks like this: You can see the light rectangles, I don't want there. Geometry of the arrow looks fine: My shader: The ...
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28 views

Look up vertex' attributes, given a 3D texture position (in shader nodes)

Is there a way to access the (possibly interpolated) vertex attribute of the closest vertices in a shader node, given a 3D position? In a CPU-based program, I'd use a k-d tree and search for the ...
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47 views

Stoll no solution for noisy volume in cycles?

I've created volumetric clouds and tried to get them to have no or at lest usable noise, NO WAY!!! I tried everything for 2 straight days now and I#m about to go up the walls.... I tried follow ...
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Cycles fog not working when rendered

I have tried following a few tutorials to get fog using nodes when rendering with cycles but they all turn out with the same result. This is a screenshot of the node setup for the fog. When I go to ...
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19 views

specific volume should not block light

is it possible to set a certain volume so that it does not block the light of the world wallpaper in Cycles. It is a cloud that is overhead, but not supposed to block the light from above. Yes sounds ...
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1answer
19 views

Manipulating a volume cube via it's mesh -- Volume remains unaffected

Attempting to manipulate a volume cube by manipulating the mesh. I've subdived / pinned the top face of the mesh to an ocean sim with a shrinkwrap (trying to simulate an underwater volume so I can pan ...
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27 views

Volumetric Project Image from Center

I've got a volume being generated from an image texture, I just need it to come from the center instead up straight up and down. Here's what I have so far. I tried using UV for the texture coords, but ...
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1answer
52 views

Multiple smoke materials which have intersecting domain

I have two objects which are smoke generators and their domains are unfortunately overlapping. Now, when I apply one material to one smoke, it gets applied to the other smoke as well. I have baked ...
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1answer
109 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?
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1answer
71 views

Why is my volumetric lighting shown in the viewport but not in the render?

I am working on Blender 2.93.0, using EVEE as a render engine. My friend (and all the tutorials I've seen) did the exact same thing than I did and has no problem seeing the volumetric lights rendered. ...
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29 views

How to fix background issue with cycles fog?

So, I used a cube to create the volumetric fog with volume scatter. The problem is that in the camera, the background is black instead of matching the fog. Is there any way to fix this? Is there ...
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21 views

Get evaluated Node tree values from cycles/eevee

I know that shader nodes in blender are just visual representation and which is compiled into svm stacks and then evaluated. https://blenderartists.org/t/node-tree-evaluation/1205276 What I have in my ...
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1answer
73 views

How to reproduce this kind of bright effect animate on Blender?

I need help to reproduce this kind of bright effect on Blender, but I want to animate it as well, the animation could be it just turning around in circle. What do I need to search about to recreate ...
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1answer
29 views

Link volume to collection

Helly everyone, How can I correctly link a volume object to a collection? When I'm creating a volume like this: vol = bpy.data.volumes.new('Thing') I wanted to ...
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33 views

How to get each voxel's density of Volume object from Python code

First of all, my purpose is exporting/generating raw volume data from triangle mesh. Latest blender (2.93) has "Mesh To Volume" modifier so I tried it. When I created Volume with "Mesh ...
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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 ...
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21 views

Make a light ignore a specific volume [duplicate]

In Blender 2.93 / Cycles I have setup with 3 lights, a smoke volume and a Volumetric Scatter. I want a light to ignore the smoke volume completely, but still shine through the volumetric scatter. is ...
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27 views

Creating a custom glossy volume shader with reflections?

I've imported a whitewater fluid simulation made in Houdini as a VDB and have managed to render it using the Principled Volume BSDF, but without the specular/reflection highlights that whitewater ...
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44 views

Volumetric Light Cache in Blender Cycles

I have been using some pretty heavy volumetrics in Blender Cycles recently, and I am planning on making an animation with them that will most likely take ages to render at any quality level. I know ...
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33 views

Eevee Volumetric Scatter Stepping/Banding

I'm trying to make a scene for rendering a comet in Blender, as seen by spacecraft camera (i.e. realistically). The comet is done using voluminetrics, with density (and as such, reflectivity) falling ...
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41 views

Use volume float vector velocity field for motion blur in Vector pass

I simulated a pyro sim in houdini that generated three vector field (vel.x, vel.y, vel.z) and then merged them into one velocity field that I exported to a vdb. I applied a basic shader to the volume ...
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21 views

Shading with Float Vector Volumes

Houdini 18.5 has a volume Bake sop that computes the internal scattering of emission based on the density. This is used to minimize the render times because the volume bounces can now be set lower and ...
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27 views

Sorting out eevee crash?

I have a simple cube, quite a complex node setup involving volumetric lighting, but when eevee renders, either to viewport or image, my windows manager freezes and blender crashes. The output to stdin ...
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1answer
525 views

why isn't volumetrics showing up in the viewport in cycles x? [closed]

volumetrics isn't showing up in the viewport. Can anyone try it their self to view any volumetric object in blender 3.0.0 alpha(cycles x)
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1answer
66 views

How do I fade a procedural clouds on the edges of a bounding box?

I have procedural clouds made following Default Cube's tutorial, the node group looks like this: The whole thing is bounded by a large cube, and I want to fade the clouds near the edges so that they ...
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1answer
78 views

Why does my volumetric jet material appear so low res?

I'm trying to make a jet material for my rocket ship but the volume appears low res no matter how much I scale up the voxels. I also played with the size of the object and that seemed to do nothing as ...
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1answer
105 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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1answer
58 views

eevee smoke/volume not being occluded

Been touching upon EEvEE every so often depending on what kind of image quality I'm looking for at the moment, and for the first time I am adding smoke. More specifically Glowing Smoke, as in "...
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25 views

How to stretch out animation time for a volume object

Blender volumes are great; particularly when I've got a scene (as I do right now) with a number of fluid effects going on. I can simply save them into a directory as a bunch of OpenVDB files and ...
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35 views

The effect of volume absorption is not visible

The effect of volume absorption is not visible
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26 views

Volume emission without texture when using UV coordinates

I am trying to follow this tutorial for creating laser beams in Blender, but I can't get the Noise Texture to work as the Emission strength. When I plug the Emission output into the surface input, the ...
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15 views

Is there way to Import a VDB sequence other than the add volume (single file) operation?

I am currently running a quick script and manually changing the the file name (ie. copied the first import and copy pasted from the info window. I'd love to make a variable driven loop, but, my python ...
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1answer
39 views

Why my volume nodes not working in blender? [duplicate]

I tried experimenting with volume nodes in blender but none of then seem to work. Every node just produces a rough volume cube. This includes for every type of volume node like Principled Volume, ...
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58 views

How could I make a VDB volume not cast shadows?

I imported a VDB volume from Houdini into Blender 2.92 and it creates some weird shadows. How could I make it not cast any shadows? I went into Visibility > Ray Tracing but there's no Shadow ...
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1answer
96 views

Smooth Volume Rendering without Denoise in Cycles

I am trying to get my volume to render smoother without using denoising in Cycles. Testing various render settings for volume I can't seem to achieve the desired result. I figured the volumes step ...
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70 views

Rendered image saving as blank image

I rendered volume ok, but it saves as a blank image. I've tried save-as PNG and exr and also tried the output in compositor. When I render as a combined image the volume acts as expected, however ...
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41 views

Volumetrics look good in viewport but render weird

So I'm creating an underwater scene in Eevee using volumetrics for light rays. It has dark and deep colors with shadows and stuff in the viewport, but once I render it, it looks terrible. I'm pretty ...
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1answer
55 views

What 3D texture formats does OSL support?

So I'm playing with OSL right now, and have had a lot of luck in the past with texture and most of its key-value optional parameters. I've moved on to ...
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1answer
115 views

Get vdb motion blur in blender (from embergen)

I made a basic fire and smoke simulation in embergen and exported it as a vdb sequence (with the velocity data). When I put it into blender I get three velocity float values instead of one float ...
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1answer
67 views

Is it possible to add holes on volumetric clouds in eevee 2.92?

I'm trying to figure out if it's possible to add a hole/s in volumetric clouds whether it be in the mesh or some kind of texture trick, but I'm having no luck at all. I also need it to be able to be ...
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27 views

Eevee, lighting, Volumetric lighting crosses a mesh

I created two light spots with volumetric to get a beam of light with eevee in a real-scale scene. My light passes through my luster mesh despite having turned the shadow mode to none for the various ...
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1answer
89 views

Cloud with volumes renders blurry

I have been struggling with this problem for a while. I am trying to create clouds using volumes. I have figured out settings that works great and the outcome is like I want it to be except it renders ...

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