Questions tagged [volumetrics]

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

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7
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426 views

Visualizing 3D voxel data in Blender 2.8

right now I'm trying to visualize my scientific 3D data in Blender 2.8. So blenders built in textures or smoke simulations do not lead to the goal. I've read that older releases of Blender do support ...
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669 views

Import and render raw volumetric data

Is it possible in Blender to import and render raw volumetric data (outcome of fluid simulator)? I have a set of 3d arrays of floats in C/C++ and I used to render it frame by frame with OpenGL using ...
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211 views

Planetary Clouds

Is it possible to create a planetary-volumetric style clouds on the faces of a sphere? Every attempt I try always comes out to look too 2d when approaching the image closely. I tried the volume output ...
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0answers
297 views

Volume rendering an image stack in Blender Game Engine

I'm trying to create an interactive scientific visualization tool using the Blender Game Engine (BGE). One of the things I want to include is a volumetric rendering of an image stack. An image stack ...
3
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1answer
140 views

Transparent object shaddows in volume material [Blender Internal]

Currently I am fighting with lighting artefacts within a smoke simulation, when the lightsource is within the volume and especially also within a transparent object within this volume. (Note this ...
3
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0answers
216 views

Volume scattering is limited by the fire simulation domain

I have a scene with fire and smoke simulation, adaptive domain enabled . Fire is placed inside a cube with the volume scatter shader . But the light scattering around the fire appears to be limited ...
3
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0answers
159 views

Cycles volumetrics: artifacts on edges

I'm creating cloud in Blender/Cycles. While following this tutorial I came across artifacts:. The problem is marked on render (the biggest visible artifact) and seems to appear in areas where faces ...
3
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0answers
165 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 ...
2
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0answers
26 views

Blender 2.81 Eevee lights clipping through objects when using volume shader

I want to use Eevee to render my animation in Blender 2.81. The animation involves lights behind/inside objects with one side open. When I add a cube to the scene with a Principled Volume shader in ...
2
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1answer
138 views

Volume Absorption not working

I am making a cup of coffee. I created the liquid as a mesh with transmission as 0 and applied volume absorption to the mesh in order to create that darker look, however, there is no change in the ...
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0answers
238 views

Atmospheric fog in Blender 2.8

I am a long time Blender user and I built some nice scenes with it. I also love the new 2.8 but ever since I was working with volumetrics in Blender I was never really happy with it. So what I want ...
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0answers
19 views

Is there a way to bake volume density information which is generated from an OSL script?

I am trying to generate volume density information (e.g. a mandelbulb) from an Open Shader Language script in cycles. This however only works when rendering with a CPU. My GPU is much faster but doesn'...
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85 views

Issue with Volume Absorption inside Glass

first time posting here and very new to blender, Im following BlenderGuru's latest tutorial and I'm having some issues with volume absorption, this is of course not a job, I don't have a deadline, so ...
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492 views

Cycles & Blender Render for God Beams / Crepuscular Rays / Sun Beams

I'm having trouble getting the actual beam of light to show in the render of my image. What I want to do is create an image that looks like this: However, In blender render I am unable to get the ...
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0answers
471 views

Cycles Volume: Dynamic Step Size?

I've been thinking about Cycles' Volume Scatter, and how AMAZINGLY SLOW rendering volumes are. Especially so if you have both a very large, very far away volume (like clouds)in your scene and a very ...
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10 views

Cryptomatte from volumetric environment is not fully opaque

World shader is simple Volume Scatter with 0.01 density. When I get matte of default cube I get partially transparent result. Look at red-highlighted values. This is a point near center of the cube's ...
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0answers
16 views

Weird render faillure material volume

I am just starting with blender and am actually in the middle of my first tutorial from Blender Guru. I just rendered a scene with a coffee cup with coffee in it, and suddenly dark tiles appear in ...
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0answers
31 views

(2.81 Evee) Volumetric spotlight shows through solid object

I'm trying to add "real" spotlights to my scene, as in stage lighting. Naturally I want spotlight-looking objects present. Problem is, when I place the light inside the object, it still shows through. ...
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0answers
42 views

Volumetrics - Different results GPU vs CPU

Hey fellow Blendy people, I'm running some benchmark comparisons between various render engines involving a lot of small, simple scenes. Anyway, on my test scene for volumetrics, I'm noticing a ...
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0answers
29 views

Why i cant see volume in Render but can in preview?

Why I cant see volume in renders, just the light. Preview looks ok, but render not. Not even in EEVEE or Cycles.
1
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1answer
80 views

Density texture in Voxel to mesh?

Hi , I am working on a scientific illustration. This is a porous structure of a membrane. How can I create the bottom part of the block? Can I convert the density voxel to mesh?
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34 views

How to add glare effect to a object in volumetrics?

Hey guys I need your help!! I want to add the glare effect (fog glow) while volumetrics is turned on in world tab but unfortunately I am not able to do so.
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0answers
87 views

Render 3D probability volume (3D texture) cycles / eevee

I'm looking to render photorealistic volumes from 3D textures (think MRI scans) together with geometry. So far, everything I've seen to do this is specific for BI, not for cycles or eevee. However, ...
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1answer
552 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 ...
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0answers
260 views

Eevee - Volume Scatter shader doesn't render but shows on preview

I also tried baking indirect light with a light probe and, the volumetric option in the render tab is activated but I still couldn't figure out how to make it appear also on render. Maybe it's not ...
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0answers
25 views

How to turn normal lights in a video to have more volume

So I saw this video on Aquaman-style Visual Effects, and I kind of understood how that worked. The problem was that the tutorial was made in After Effects, which I do not have access to, so I decided ...
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0answers
606 views

I can't render volumetric lights in Eevee with an orthographic camera

So this is the problem I'm having, when I render volumetric lights in Eevee, they don't show up with an orthographic Camera, but they do when using a perspective camera. Why is that? is there a way to ...
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0answers
63 views

Black spots on Z-Buffer (Depth Pass)

To begin, I'm using a MacBook Air 13" early 2005 model. I cannot render high-quality images with ease. I can only render on the iMacs my school has allowed me to use. If samples/quality is a part of ...
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0answers
56 views

Volumetrics material not showing in final render (Cycles)

I have a scene with a sphere that has a Volume Scatter (Anisotropy 1; Density 0.1) material. When I preview it in the viewport (at 750 samples), it seems to be in the scene fine and how I like it. ...
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0answers
156 views

Multiple volume scatter objects - smoke and fog

Hello I have a problem in which my smoke simulation is inside the giant box which has volume scatter and absorption shaders. During rendering the smoke domain is visible as shady object around the ...
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0answers
194 views

Volume+Caustics?

Is there any way to make caustics work in a volumetric environment? When using the Cycles render engine, light passing through a Glass BSDF in a volumetric world will not show through on the other ...
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0answers
44 views

How to make volumetrics work

I've been reading a lot about this, but I can't find the solution. Anything I've tried so far hasn't helped at all to solve my problem. The scene is simple. There's a sun light outside which is ...
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0answers
79 views

Problem with Volumetric and Compositing in a Complex scene

I am new to the Blender community. Recently, I'm working on a school animation project which I created some animations and applied volumetric scatter in the scene to create depth. Unfortunately, due ...
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0answers
247 views

OSL Volume in 2.79

I'm learning to work with OSL but it seems something has changed between Blender 2.79 and previous versions regarding OSL Volumes... ...
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0answers
122 views

Adding a Texture to a Volumetric Drastically Increases Render Times?

so, I've been trying to render clouds using Cycle's Volume Scatter node in a way that doesn't murder render times. Plugging Volume Scatter into the Volume option of a Material Output, works fine, ...
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0answers
262 views

“Inside & Outside” volumes IE glass within glass (cycles)

How can we manage "glass" interfaces which have a different volume (absorption) on each side of the interface. For example colored liquid within a colored glass. I understand that to manage correct ...
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0answers
221 views

Does GPU volumetric rendering work with Mac Pro Radeon D700s?

Has anyone successfully rendered smoke (or any volumetric shaders for that matter) with GPU on a Mac Pro with Radeon Firepro D700s? I saw that smoke/fire is supported on Open CL (as listed here: ...
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0answers
133 views

Why is my beer black?

I've been following this blender guru tutorial (Link to relevant section of tutorial) However, once I try to render the beer material it is coming out black I've followed very closely with the ...
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0answers
190 views

Volume material is not rendered onto environment map

I have an object with a volumetric material in the scene which renders a bunch of clouds correctly from my camera. I set up a cube to create an environment map by setting up the texture as environment ...
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0answers
926 views

Voxel data as image sequence in cycles

I have image sequence of an object. How to render it in cycles as voxel or volume? Image sequence represents a slices of 3d object. Images are in .png. I would like to turn theese slices in 3d object ...
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0answers
15 views

Is possible reflections for voxel in eevee Blender 2.8x?

Ok, i tryed to make reflections for fire/smoke in eevee, but meet a problem with it. In cycles all is good, but in eevee it not working, even if i use a reflection probes. Also, there is a question ...
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0answers
18 views

How to write custom volume attributes using python?

I was wondering how I could write a custom attribute just like density and flame using python. My intention is to use it for volume rendering so if there's a strict data structure I have to follow it'...
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1answer
27 views

How to render a world position pass that includes volumetrics?

I've found the 'how to render a world position pass' Q&A on here, but I'm stuck at how to render one that includes volumetric objects (smoke in a domain object), it does not show in the render ...
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0answers
40 views

Object ID or Material ID using Volume Scatter

If I have volume scatter in the scene both the object ID and material ID passes are affected by the volume scatter: with the volume scatter off, ID passes look fine: is there a way to get clean ID ...
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0answers
73 views

Cycles Volumetric Lighting Render Issue (2.81)

I have a simple volumetrics setup for a nebula-esque scene. Now, the render has to loop, so I used multiple boxes with the same noise textures in them. In Eevee, this works great, but in cycles, each ...
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0answers
49 views

Volume Absorption density of whiskey

In fluid in a glass it mentions using a volume absorption node. Below are the settings suggested for red wine in the answer from @gandalf. Any clues re what settings, particularly density, to use ...
0
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1answer
18 views

Lines appear volumetrics

I am using a Volume scatter node to get a foggy effect, but I get these lines showing up on the floor.
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0answers
24 views

Fire bleeding in eevee

I was messing around with fire in realtime with eevee, but I was cornered by this strange comportment, with the original size of the model the fire seem to bleed through the geometry, but when a scale ...
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0answers
19 views

Get smoke color from flow object Vertex Color

I have an alembic cache of an animated object with animated vertex color and I'm using this as a flow object for a smoke simulation. All that is generating smoke well, but... Does anyone know how I ...
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0answers
10 views

Discrete Version of OBJ Mesh for physical simulation

I am using SOFA physics simulation to deform a yarn, first i have to get a discrete. version of the OBJ mesh. which is know in the format of VTK There is an example in SOFA tested on bunny.obj and it ...