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Questions tagged [volumetrics]

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

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15 views

Blender crashes when I use volume absorption

I recently began using Blender. I was attempting to add volume absorption to a transparent material, however when I did, Blender stopped responding and crashed. It only crashes when I try to render ...
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14 views

Eevee volume emission texture space is cubic even for a cylinder solid [duplicate]

I created a solid cylinder with an emitting volume material. In render mode, the glow looks cubic instead of following the circular profile of the cylinder. This could be because the texture space is ...
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15 views

Hollow VDB while rendering?

Rendering the VDB in viewport will give me the same, hollow-looking result as in the final render, but messing with the "wireframe" option underneath viewport display will give me a thicker ...
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1answer
109 views

Is there a way to calculate the volume difference between two objects?

I'm relatively new to Blender so apologies in advance in case this is too basic of a question. Trying to come up with a way to compare two files and identify a volumetric difference between them. For ...
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2answers
50 views

Apply volume to a spherical texture?

I have a quick texture applied on a UV Sphere. It is meant to be a spherical nebulae that I animate by keyframing the nodes settings (mostly color ramp, noise textures and color dodge mix shaders). ...
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28 views

Volume Absorption not darkening

I don't understand why my "coffee" still looks like water. What can I change to make the coffee darker but still realistic? I couldn't post my screenshot, so please let me know anything I ...
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18 views

Painting with smoke

I'm trying to paint with smoke. As described in the dynamic paint guide on miikahweb and shown on his Youtube channel. Is this still possible in blender 2.9/2.8? If so, how?
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2answers
62 views

Rendering smoke to texture sheet

Is there a way to bake an explosion in blender as a 3D texture with each slice of the volume rendered to a texture sheet? Here is an example done with Unreal 4. If there is no default way, I made a ...
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2answers
40 views

Why am I unable to color my volumetric clouds white?

I am trying to render a cover of white clouds as seen from above. I am using the Principled Volume shader, using gradient and noise textures. It now looks as follows: However, the clouds are very ...
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1answer
31 views

render animation with eevee, volumetric disappear some frames

i have a bug with eevee when i rendering, my volumetric ambiance disappear sometimes without any reason. I noticed it once a sequence was rendered, some frame, totally random, i haven't my volumetric. ...
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2answers
96 views

Principled volume shader's weird behavior in Eevee

I applied a material with Principled Volume (or Volume Scatter) shader only to the cube but it seems like the whole world is affected too. This only happens with EEVEE render or in Material Preview, ...
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1answer
39 views

Rays emanating from a point on the surface

I am trying to create an effect in cycles (like the attached photo), where points on the surface emit rays (like god-rays). I have tried adding a spot light at the location where I want this, along ...
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0answers
29 views

How to export a volume as a separate render pass and composite it correctly in Photoshop?

I have one render layer with objects and one render layer with a fog volume. The objects are set to Holdout on the layer with the fog. The combined composite output (left image) looks correct. It also ...
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22 views

Object is transparent against background

This scene was nice to work with for a while, but somehow I managed to push a button that makes the objects transparent against the background. How can I get this back to normal?
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21 views

is there way to hide the start of a light and only show it after it touches an object?

I am doing a render in blender and I wanted to add a dusty old feel to a scene so I added volumetrics but as soon as i added it you could see the source of the lights inside and it looks really bad. ...
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2answers
65 views

How to create volume scattering material not throwing shadow?

I'm using Blender 2.83 with Cycles and I'm an absolute newbie to both. I'd like to visualize light rays in a part of the scene (like godrays). For this I put an object using volume scatter material ...
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1answer
60 views

How to make fog with an image plane?

I was trying to remake a scene from Assasin's Creed. It features the main character jumping from a pretty large building. I already have two volumetric lighting in my scene. Its literally impossible ...
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1answer
76 views

OpenVDB does not show in render?

I was trying to render out a sequence with OpenVDBs imported from Houdini and all of a sudden Cycles stopped rendering out the actual volume but only the reflections caused by it along with my model ...
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1answer
32 views

Blender Evee volumentrics aren't working as they are supposed to

why does my cube look so bad while the other one looks so crisp and detailed
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1answer
39 views

Starlight spotlights w/ volume help

I'm trying to create something similar to this image's sky-box. I tried cutting holes into a plane and shining a spotlight through. My attempts end up with the light hitting the ground (which I don't ...
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0answers
17 views

Displacement works in viewport but not in render (Cycles)

My problem is that my noise displacement map is working well in the viewport (Cycles rendered mode) but when I f12 render the image, the displacement just disappears. What am I doing wrong? enter ...
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1answer
30 views

Volumetrics with an alpha background, can it be done in cycles?

I have a scene with an egg cracking slowly. Inside the egg is a bright light. I used a cube to create some volumetrics and the result is great but I need a transparent background. I found a couple ...
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2answers
390 views

Colours in OpenVDB volumes

*For more detailed information; see below I am working with (OpenVDB) volumes in Blender, which I use to create animations. This is an example: Both sides are different .vdb files. Now, I want to ...
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0answers
25 views

Cannot Export as GLTF file with volumetric mesh in Blender 2.83

I am trying to export a personal project I made in GLTF format. The problem I am getting is the volumetric mesh looks black when exported. Is there any way how to overcome this problem[][1
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0answers
81 views

Flame shows in Solid view but not Rendered view (in Eevee)

I'm trying to use Quick Effects -> Smoke to start generating a fire simulation, selectively turning off smoke settings. I work primarily in Eevee. The simulation displays properly when I'm in Solid ...
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1answer
80 views

Where is the volume step size option in Blender 2.83?

Here is a picture of what I see in the volumes dropdown: I tried going through all of the dropdowns in the render settings but still, no such luck.
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1answer
32 views

3d reverse masking of volumetric

Is it possible to create a volumetric cube but mask only the space of that volumetric cube by a mesh? Hence if I put Suzanne inside the volumetric I only see her? The effect I am looking for is how at ...
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1answer
981 views

God Rays through window pane: Cycles

I'm creating a scene for a project and I wanted to go for the god ray effect achieved by the lights passing through the window. I added a mesh onto which volume scatter node was added, but still, even ...
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0answers
55 views

2.83 Volumetric Light flickers when camera moves

Volumetric light always flickers in Eevee when the camera is moving. There's also DOF, but it flickers even when it's off. In this particular video it does not seem that horrible of an issue, but in ...
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1answer
26 views

Eevee volumetrics different in render

When I was trying to make a cloud in Blender, I began to notice a strange issue. When the cloud is rendered using Eevee in the viewport, it looks fine. But when I render it, it looks much more ...
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1answer
36 views

How to create moving, dynamic/animated fog/clouds?

I watched tutorials on how to create fog within bounding boxes, but the fog is static. I'm trying to create a scene of an airplane where the camera is looking down on the clouds, and the clouds should ...
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0answers
14 views

Blender 2.8.3, Volume Scatter Fog, Does not scale up with mesh

I am using Blender 2.8.3 and am watching this video to create fog in my scene. However, the after applying the volume scatter node to my material output, it appears but not to the scale of my bounding ...
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0answers
27 views

Principled volume looks completely different between Eevee and Cycles

I am having an issue getting a volume shader to render properly in cycles. It looks essentially how I expect it to in eevee, but for some reason the black part of the render becomes a little distorted ...
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1answer
68 views

Fog in Blender: Through World node or Object Node?

I recently started to work with the volume shader in Blender 2.83. I've got two questions: What is the difference between connecting Volume Scatter to WORLD NODE and OBJECT NODE? Which shader is ...
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0answers
22 views

Black cubes appearing using multiple VDBs

Hi wonderful Blender folks, I've imported multiple VDB files to create smoke in this scene, and in Evee it renders fine, in solid it looks normal, but in Cycles these weird black cubes appear, and in ...
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1answer
39 views

Volume Absorption is only applied to the “top” of a mesh

I am following the BlenderGuru tutorial of making a cup of coffee, but when I make the coffee liquid using volume absorption, the coffee only appears to absorb light from the top. When I adjust the ...
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2answers
304 views

Sunbeams! But without blurring of the rest of the scene?

I have a scene, rendered in Eevee! I also have some sun rays, with a spotlight and cube that provides volumetrics! But... The cube providing volumetric also makes the rest of the scene really blurry....
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1answer
44 views

Flames show in viewport but not in render

I've been trying to render out a simple fire/smoke sim. Everything looks fine in viewport but when rendered the flames do not show. I'm using cycles with optix in blender 2.83 steam release, on ...
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0answers
44 views

Import volumetric data to Blender 2.83

Dear Blender Community, since Blender has a brand new volume object type, I'm trying to import volumetric data which is not in openVDB file format because it was generated during a physical ...
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1answer
101 views

How to access the list of volume grids using python?

I wanted to access the attributes imported with a vdb file but I have no idea how to do that. Actually what I was trying to do is - In the attribute node in material for the vdb file I wanted to get ...
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0answers
22 views

Is there any way to use Cycles for 3D data visualization?

I have a CSV file containing coordinates for stars in a galaxy and I want to plot them through volumetric data inside a cube. I have tried the voxel data type in blender 2.79 with blender render (it ...
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0answers
15 views

Precise control of fog falloff/density?

Is there a way to set up a fog volume (in Eevee) so that you get zero fog for a set distance, and then a way of controlling the density with a color ramp for another set distance?
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0answers
16 views

Problem on creating fogs

Hi want to create a fog in blender 2.82 but when I add principle volume or volume scatter to the cube , the fog remains in the original size of the cube and I can't scale.
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0answers
35 views

Problems with transparent glass image output in Cycles

I'm working on illustrations for a chemistry curriculum. The background world setup is a very light grey with some rough studio lighting approximation. I'm using a volume inside the glass beakers as ...
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0answers
31 views

Is there any support in Cycle or Eevee for volumetric data rendering on a non-uniform grid?

I have some volumetric data (on a non-uniform grid) in files and I would like to be able to use blender to make volume rendering of them. The difficulty here is that the data is actually sampled on ...
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0answers
14 views

Volume shader always makes a cube [duplicate]

Whenever I add a volume shader (of any type) to a mesh, the resulting fog effect always appears as a cube, regardless of the shape of the mesh itself. How do I get volumetric effects to conform to any ...
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0answers
38 views

Adding distant fog with the sun lamp

I've been using a sun lamp to light an outdoor environment in the Eevee engine. I've got a HDRI but only as an image (no lighting data) because I didn't enjoy how it lit up the environment and I ...
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0answers
12 views

Shadows disappear when you turn on volume absorption in gpu render (Open CL)

Blender: 2.82a Gpu: rx5700 Whenever I try to turn on volume absorption in the glass I'm trying to render the shadows disappear. It doesn't matter if I use the principal shader or the glass one the ...
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1answer
46 views

Why is my Eevee viewport render different from my full render?

I'm a little confused why my Eevee render looks different from the viewport preview. Above - Preview Above - Render Just a bit confused here. Any help appreciated.
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16 views

Smoke not Rendering in Eevee but Does Render in 3D Viewport

I am tearing my hair out with these smoke simulations. It's very difficult to get the right texture and colour of smoke simulations when the object is moving or there is a wind force field. In this ...

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