Questions tagged [volumetrics]

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

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15 views

Volumetrics different results between viewport and final render

So I have a background behind my scene with a nebula made out of Principled Volume which looks spectacular on the viewport but when on the actual render 90% of it is nowhere to be found... I'm using ...
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1answer
11 views

Object affect volume shadow only

I'm trying to have an object cast volume shadow only, but it should NOT cast shadow nor be visible to the camera. Is this even possible? Here's my test file
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14 views

Point density and volume material woes in Blender Internal

I'm currently working on an underwater mermaid scene, and I ran into several problems, first is that I can't usually get the halo particles to fade over time, which made me resort to putting the ...
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13 views

Procedural Cloud missing detail

I want to make a cloud, but one that looks more like it was made out of absorbent cotton (reference). I think the difference is that the absorbent cotton cloud should be denser and more detailed. But ...
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16 views

Blocky fire in rendered view

In the render view my fire is kinda "blocky". No matter it is in Eevee or Cycles. When I change Emission to 0 and Blackbody Intensity to 1, is better, but this is not the result I want to ...
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24 views

Firefly in EEVEE in Volume

I have firefly in EEVEE. Denoise is not helping in compositor neither. Bloom is off. Blender 3.0 beta. and 2.93 have it too. How can I fix it without using Photoshop, since it is an animation ...
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18 views

Shadow Catcher does not work when Volume Scatter is enabled on the cube

Shadow Catcher does not work when Volume Scatter is enabled on the cube. The thing is that I add a plane on which I turn on shadow catcher. When activating a camera with a built-in Background Image (...
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24 views

Object outlines suddenly clearer partway through render (Eevee) DOP issue?

I've rendered 2 animations in Eevee, and they both have a similar problem where at first the subject of the animation has a nice sort of light wrap/depth of field soft edge sort of thing or I don't ...
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14 views

Fix lines in volumetric in EEVEE

I render space scene in EEVEE. Density is 0,01. Scene have two light - fill sun and blick point. And in scene I have this lines. I up all samples, but dont have clean pic. What i do wrong? settings, ...
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12 views

Slicing doesn't work for Volume/OpenVDB file

When loading my vdb-files in Blender, I can't make the "Slice" functionality work. Nothing happens when I try to apply it. I'm using Blender 2.93.5. The vdb-files is generated from a 3d ...
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1answer
29 views

Block Shadows appearing in volumes

I have these strange shadows emerging from a smoke simulation. I circled them with the red. They don't seem to be correlated with any actual density of smoke in the simulation. Placing a plane above ...
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21 views

Export Volume as VDB ( when using mesh to volume modifier)

is it possible to export a volume as vdb when using a modifier on an empty volume to convert a mesh to volume, and using a volume displace modifier? Thanks a lot for your help!
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32 views

Is there any way of manually creating volume grid data?

I would like to know if there is a way of manually creating volume grids. Like the data we obtain from mantaflow simulations or import from external vdb files. For example, is the creation of volume ...
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8 views

Volume dynamic paint

Is there a way to dynamically paint a volume like a 2D mesh? For example, I'd like to pass a geometric shape through a volume and mark the path. I've checked the API's and documentation can not find ...
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26 views

Make volumetric mist finer - and perhaps even let it drift a little?

On the advise of several youtube-tutorials, I made mist with the following setup But as you can see here, the mist is rather lumpy, and since it doesn't drift, it doesn't really look like mist. ...
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1answer
19 views

Huge scene - scatter wont work / cant scale scene down

I am a bit stuck here. I have a very large scene (scifi concept art with 2km tall building + 150km environment). I started with realistic sizes, but now I have to deal with this incredibly large scene....
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1answer
24 views

Volume Not Visible Against World Background

I can see the volume and distant haze in the viewport, but the render the volume is not visible against the black background, and nothing visible against the objects which look in constant haze. ...
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3answers
770 views

Simulating neon: Find angle between two vectors with shader nodes

I am attempting to simulate neon inside a glass tube (a real neon light and not those florescent ones), and am having difficulty making the innermost portion of gas look brighter than the outermost ...
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1answer
35 views

Having Issues with Volumetric Fog

how are y'all doing? I have a slight problem going on with creating volumetric fog. Here's the story: I was following along with a tutorial from Ducky3D and he got to a part where he started showing ...
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21 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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15 views

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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25 views

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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18 views

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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38 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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14 views

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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26 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
54 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
135 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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0answers
34 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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64 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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69 views

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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20 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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29 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
112 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
132 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
137 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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39 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
90 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
35 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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42 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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66 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 ...
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0answers
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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33 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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57 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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42 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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77 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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22 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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34 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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