Questions tagged [volumetrics]

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

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Manual Render of volulmetric pass

I would like to render a volumetric pass separately in cycles. Usually I render a single beauty pass and a separate volumetric to composite in photoshop to minimize the amount of compositing of the ...
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Can Blender bake emissive volumes with alpha and bloom? Composite glare? How about using SimpleBake addon?

I've never baked anything in Blender. I've watched many videos and read lots. But nowhere can I find anything that talks about baking/SimpleBake combining emissive volumes with alpha and bloom. And ...
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Principled Volume not working

As a beginner I am trying to follow a tutorial and learn by doing. My principle Volume doesnt work the way it is inteded to. Everything above 0 density makes everything appear white. I have searched ...
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strange noise in volumetric render

hi. Cycles, blender 3.3.0 I have bug in volumetric. in light path volum is 10. 4096 samples. In scene volum is cylinder. Noise on the left up side. I have denoisers - in render and in compositor.
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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 ...
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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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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
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1 answer
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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 ...
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Load VDB via python

I'm trying to find how I would load in a VDB via python. Is it possible to do this without ops? Some sort of analogous function to D.images.load()
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How to make volumetric fog darker in the compositor?

So I rendered this glacier scene in layers and I am trying make the volumetric fog darker. However, whenever I try to make the fog darker (i.e. with either the color ramp, color balance, RGB curves, ...
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Volume Artefac on animation, how to remove?

I got some weird artifac on my animation (See gif, couldn make it longer due to size), which I assume comes from the volumetric fog I have. It almost seems like there is a static overlay image on it. ...
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Why does my volumetric atmosphere not have an orange sunset region?

So this is the effect I'm looking for: This orange glow in an atmosphere, right where the shadowy and the light side meet. However, my material (which should be pretty physically accurate as far as I ...
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Dark spots at intersection of volumetric spotlights

I have a bunch of volumetric spotlights in my scene. These are Spot Lamps parented to cones with a Principled Volume material. When several of these lights shine at the same spot or when one light ...
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Is is possible to use grid volume as 3D texture?

I have been able to convert and import 3D MRI brain image in Blender 3.2.2 using OpenVDB format. The result is a volume grid. Now, I would like to be able to use this volume grid (in fixed world ...
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Cycles makes weird stripes artifacts when Volume is instanced

I wanted to make a smoke trail like in this video So basically I made a Particle System and chose as the particle Object a Volume cloud. In the Render Viewport Everything looks nice, but if I render ...
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Why Won't My Gradient Volume Work?

I'm trying to make a fog that is so thick you can hardly see through it at the bottom, and becoming invisible up top. I've made this setup but for some reason my volume seems to be ignoring my ...
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How do I taper the density of volume edges?

I'm creating a smoke cloud just run by the displace modifier, and want a simple volume texture, but would like to have softer edges all around the model. I have tried gradient textures (quadratic ...
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Increasing the density of a volume that is masked with a procedural texture. (Cycles)

I´m trying to create a Volumetric Shader with a detailed mask, that should then result in a lot of very small but dense (almost completely dark) areas throughout the volume. I can´t figure out though, ...
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How can I make this fog more dense in the middle?

I want to have the legs gradually disappear into the fog so how can I make the fog denser in the middle? Here is the image:
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Overlapping volumes in Cycles create huge render time. Is there a solution?

I’m creating volumetric clouds in Cycles. The result is good visually speaking, but the render time is terrible. Yet, I have an RTX 3080 Ti. The problem is concerning overlapping volumes. The render ...
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blender Volumetric rendering - disappearing at the end of the render

I am trying to render this pic of a Bugatti Veyron in EVEE. I am trying to make the headlight beam visible by introducing a simple volumetric cube in the scene. As you can see from the first pic I the ...
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I have a 3D vector math equation that makes hard white/black shapes. How do I use this to make an opaque volume?

Passing the 3D output to Principled Volume's density input yields 3D, correct results, but I'm looking for an opaque volume, which it does not give. Any tips?
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Eevee Volumetrics disappears when increasing Samples

When I set the Volumetrics Samples to 3 or less the image is visible but a bit grainy. When I set it to 4 or more the whole volumetrics image disappears. This is a test file. In my actual project the ...
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Mantaflow Fire very blocky?

i made a Mantaflow Fire+Smoke Simulation and have to problem, that the fire looks very blocky and large. The Smoke looks pretty good nonetheless. It´s a Fire + Smoke Emitter and the Domain Resolution ...
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Making Wind Tunnel

i just need a wind effector, which is limited in the width. It has a setting for min and max Distance, but i want to control the width so that i have a specific wind tunnel. Is that somehow possible? ...
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3.2.2 Anyway to taper volume scatter so the boundary is less defined/more blended; cycles

My volume scatter 'fog box'/cube has a hard edge that I would like to soften. Is than an easy way to do that? I am trying multiple 'fog boxes' with decreasing density but am wondering if I could do ...
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2 votes
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difference between seperate xyz and combine xyz?

I am trying to make a galaxy with shader nodes, and I am using a gradient texture to distort the rotation on the z-axis. I am wondering why in my setup (see below), the combine XYZ gives me the ...
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Principled volume makes entire scene grey

I am following a tutorial to create fog in Eevee using Principled Volume. After I plug the Principled Volume to the volume of Material Output, the entire scene becomes one flat colour. If I adjust the ...
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how to add a volume cube

I can't seem to add a volume cube in blender 3.2.2. I don't understand cause I am new but I saw a video called blender getting crazy at 0120 he added a volume cube in geometry nodes but that option ...
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camera coverage simulation

I am trying to create a camera coverage simulation where I will put multiple cameras inside a room with some objects to block the coverage of some cameras. Now, My job is to change the number and ...
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Casting Volumetric Shadows in Cycles Fastest Way

I am experimenting with trying to combine Eevee for volumetrics and Cycles for everything else. I have found a way to produce smoke that is really effective and much more efficient than using cycles ...
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principled volume does not accept my black color

so i have this little car scene here: and just to prove that my volume shader "works" i rendered it out in blue. Here is my result with black (nothing else than color changed): Now, if i ...
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4 votes
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Making complex-shape volumetrics

I'm trying to create a fog in the shape of infinity symbol (ထ). Another goal is to animate it flowing cyclically. I managed to achieve this on the surface of a mesh, but failed when trying to apply it ...
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Is this the correct way of compositing volumetrics?

The Blender documentation shows a neat diagram of how to composite the different render passes together in the compositor (bottom of page): https://docs.blender.org/manual/en/latest/render/layers/...
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Add extra details to VDB

Is there any way to add extra details to VDB For example, I have a vdb cloud. For the background it is enough details on it. But if I get closer to it with the camera, than there is no enough details. ...
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Using Proximity from Curve to control Volume Shader in Cube

I'm experimenting with the Geometry Proximity node in Geo Nodes, using Blender version 3.2.1. The effect I want to achieve is a volumetric shader within a cube domain that is controlled by the ...
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Render Point Density to Texture

Was curious if anyone knows of a way to render out a point density to a 3dTexture for use in a game engine? Usually these are just rendered to a red channel and then imported into a 3d texture in ...
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Make one material visible only in dense part of volumetric material?

Sorry if the question is a little confusing There are some similar questions like How can I make an object only visible through certain material and Material that's only visible if seen through ...
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1 answer
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How to use textures to influence point density node?

I want to take the shape that is being output by the point density node and displace it with other texture nodes, as described in Gleb Alexandrovs talk about Nebulae: https://youtu.be/4w8_SBxCOxo?t=...
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Make Volumes only visible when light overlapps it

I wanted to know if there is a way of telling blender that volume objects should only show the volume, the fog and stuff when it is overlapping with a light source. I was trying to replicate the ...
2 votes
0 answers
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Weird artifact/cube shapes when I put flame shader on imported vdb [closed]

I've been seeing these weird cube shapes when I import an embergen vdb and the flames run out, via clicking on the flame attribute channel. details: it only happens after all the flames in the flames ...
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Fog without volumetrics or emission

i´m currently working on a movie and need dark fog in my scene. It has to look more smoky, so it can't be as bright. With Volumetrics, the image is unfortunately still too noisy, even at high sample ...
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cube appears bright white when trying to do volumetrics

been trying to create some fog by using a volumetric cube, although keeps appearing as what is seen in the image below
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Volumes are not displayed correctly when point lights are activated in the scene?

On the right is the volume incl. nodetree, on the left are exactly these objects appended. On the right everything looks great, on the left it's broken and the cubes almost delete each other out. I ...
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Principle volume shader broken?

I have this large scene (20-30 meter domain) with smoke and fire. And wind. In object mode simulation looks fine, in render view with Principled volume shader it looks fine as well. But when i try to ...
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1 answer
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Volumetric Bullet Trails?

I'm trying to create a volumetric bullet trail for a stylistic piece. I'm struggling with how to continue with what I have, which basically amounts to stretching out a glowing noise volume. I assume ...
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1 answer
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Ground shadow is rendering out volume voxels instead of smoke shadow

I am rendering out a simple fluid (smoke) simulation, and when I render it out, instead of the smoke's shadow rendering out, the shadow is the voxel blocks that house the smoke simulation (See image 1)...
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principled volume connects to volume and the object is invisible

version is3.1.2 Follow the tutorial, but don't know why the results are completely different (:з)∠)
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Why I can't see Godrays and How to Improve my overall scene

I'm making a scene for commercial curtains and I thought of using Godrays but for some reason it doesn't show up as I want and also I feel like something is lacking from my Scene I'll attach the basic ...
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Is using a volume absorption shader on the world incompatible with transparent background renders?

I'm using Cycles in Blender 3.1.2. I'm trying to get the light volume effect over transparency for compositing later using a 2D program. The goal is to get the window and the light beams coming ...
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