Questions tagged [volumetrics]

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

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6
votes
1answer
1k views

Volume scatter shader causes black spots

I am following Andrew price's video on making clouds but my clouds are rendering with black spots on them. I have tried turning up the maximum transparency value under light paths but there is no ...
6
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3answers
17k views

Domain boxes show up in cycles render

So I recently made the switch to cycles rendering and smoke modifiers, but it's been giving me loads of problems already. This is what the model looks like: And then when I go to render it, this is ...
6
votes
1answer
413 views

Is the w-coordinate of the UV coordinate system supported by Volumetric materials?

I want to calculate the density of a volumetric Emission material using the distance inward from the mesh surface. I've been able to do this with a cube and several coordinate systems: generated, ...
6
votes
1answer
2k views

cycles volume rendering 3D image texture (CT or MR dataset)

Is it possible to render with cycles a 3D texture from discrete image data (eg. image sequence)? Basically I'm trying to get volume rendering of medical data with cycles.
6
votes
1answer
646 views

Applying gradient texture to deformed volume based on Z coordinate

I'm trying to apply a fog to my grass plane, which is deformed in multiple ways (plane is subdivied + waved by hand + 2x modifier: displace. The fog is supposed to be dense at the bottom and disappear ...
5
votes
1answer
1k views

Creating a Fluffy Cloud

I am trying to create a cloud like this (taken from Is there an easy way to make volumetric clouds for Cycles?) The closest I am able to get is I have taken these steps: Switch to Blender Render ...
5
votes
1answer
4k views

Why there's not homogeneous volume scatter in 2.72?

There was an option to render volume in blender 2.71. I was used to doing that like in this tutorial: http://www.blenderguru.com/tutorials/make-atmospheric-lighting-blender/#.VKkh0CuG_h4 But now, in ...
5
votes
4answers
2k views

transparent background for volumetric smoke? Bug?

I'm trying to use transparent background in a simple smoke simulation. As soon as I check transparent, in the film settings (cycle), the image loose the color (it is indeed transparent but black). ...
5
votes
1answer
577 views

Smoke hi-res fire artifacts in Cycles?

When rendering smoke/fire simulations with cycles I sometimes get some random lines/artifacts on my render. Do you have any idea what might be causing this? There are also some issues with ...
5
votes
1answer
316 views

How to simply find the code/script behind the volume scatter node so I can see the math?

tl;dr I need help finding the code or OSL script for the volume scatter node. Not asking how it works, just a specific, noob-friendly instruction how to find it, or a link to it. Blender is big, and ...
5
votes
1answer
135 views

Lighting a volume with a bi-color point light

I would like to light the center of a cylinder volume with a gradient light White -> Red -> Blue radially from the center to the border. I created the cylinder normally and applied a volume material: ...
5
votes
1answer
2k views

Rendering a 3D volume

I'm playing around with ways to visualize an MRI image of my head. I've extracted my brain, so there are non-zero brain voxels in the center, and zeros to the edge of the image. I'm imagining having ...
5
votes
1answer
664 views

Making Emission Object Invisible with Volume Scatter

I am desperately trying to animate a 'tour' through an interior space and am having trouble getting enough light in the space. I have added emission to mesh shapes to light the various areas and even ...
4
votes
1answer
5k views

Volume Scatter goes Black

I've followed some tutorials on Volume Scatter material in Cycle like this one : http://www.blenderguru.com/tutorials/make-atmospheric-lighting-blender/ But I can't go any further because of this : ...
4
votes
1answer
240 views

Displaying airflow inside of an engine model

Okay so basically I have a model of an engine. The purple shows where all the gas and yes gas not liquid should go. It must collide and be held in by a couple moving parts. The first thing I tried ...
4
votes
1answer
2k views

Volumetric gradient based on density?

I am trying to make a material that is translucent at the surface and opaque in the middle. How can I control the gradient? I would like the gradient to correspond with the mesh; i.e. not simply ...
4
votes
4answers
4k views

Using cycles volumetrics to make planet's atmosphere

I have seen the tutorials involving the use of the compositor to produce an atmosphere, but I wanted to be more authentic. Since Cycles now has volumetrics support, I have tried using the sphere ...
4
votes
1answer
6k views

How to make fog in Blender

I want to create a scene with some fog. I need the fog to get stronger the further form the camera it is. I already have volumetric lights in the scene, but thats not good enough. The result should ...
4
votes
1answer
3k views

Using 2D / 3D textures with volumetrics?

I've tried multiple times to get clouds into Blender. However, my scene has too many vertices for it to handle objects with multiple subdivision modifiers. I thought that, as an alternative, I could ...
4
votes
1answer
533 views

How do I make volumetric light fade to nothing

I'm trying to make some beams coming out of the headlights to give the render a bit of atmosphere but I only want it to come out the headlights so I created an area in which to do so but it fades from ...
4
votes
1answer
404 views

Apply a volumetric texture tangentially on a torus

I'm trying to adjust a volumetric texture on a torus object. Some details on this object: The material is a volume whose density is driven by a texture. This texture is a procedural one such as ...
4
votes
2answers
444 views

Cycles volumetric object with intersecting mesh

Hi I'm trying to make a character that looks like he's made of mist or smoke in Cycles. The Volume absorption works pretty much as I'd hoped. But once the character is posed, any little mesh ...
4
votes
1answer
1k views

Efficient empty volume rendering in Cycles

Suppose I am rendering a smoking torus from above in Cycles: (at laughably bad resolution, of course, but that's not the point) Cycles spends a lot of time rendering the empty space, even though the ...
4
votes
1answer
176 views

Why does cycles' volumetrics leave stepping artifacts?

When I render out my rather sharp volumetrics, I get the kinds of artifacts shown in the images and links below. They are obviously produced by step size, and samples stepping through the volume, and ...
4
votes
1answer
939 views

Volumetric Lighting not showing very well

I'm making an old dusty attic render and I've come across a bit of a problem. (Or several) I'm using 300 samples and the Denoiser, and as you can see in the following picture the rays are not showing ...
4
votes
1answer
4k views

Nice smoke in EEVEE

I made the smoke get rendering in Eevee, but I cannot make it looking pretty. I try to achieve a liquid nitrogen effect, but it's hard to make beautiful motion and nice colors. Even more, all the ...
4
votes
0answers
204 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 ...
4
votes
0answers
648 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 ...
4
votes
1answer
2k views

How do you make a cycles volume material fade to invisible at the edges?

I'm trying to model a spark using Andrew Price's tutorial (Blenderguru), but the sparks always look wrong. You can always see the outline of the ico sphere. I'm wondering if there's a way to soften ...
4
votes
0answers
293 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
votes
3answers
2k views

How can I soften my Volumetric Light borders?

I made a volumetric light based on a sphere, the borders are too notorious, it even looks like a texture. Is there any way to soften the borders like adding a blur, but in the single object, without ...
3
votes
2answers
3k views

Volumetric Lighting is not working

I have a simple setup to try out Volumetric Lighting. I have a spot lamp and Volume Scatter set for the World. The cube has a window for the light of the spot lamp. But no Volumetric Lighting. I ...
3
votes
1answer
4k views

Why doesn't an Environment texture appear when the world has a Volume Scatter shader?

I'm working on lighting a scene in which I need to have both an Environment texture for the background and Volume Scatter for light cones, but when I check the volume section in World setting and ...
3
votes
2answers
2k views

Why doesn't Volumetric follow the shape of Mesh in Eevee?

So I was in the middle of making a ball-shaped smoke, but the volumetric effect didn't work following the basic shape. It remains cube in Eevee Blender 2.8; while in Cycle it works, but in Cycle it ...
3
votes
1answer
10k views

Is it possible to make visible spotlight lightrays? [duplicate]

I'm using a Spotlight on one of my scenes, first I planned to make the effect of the lightrays on other editing software, but maybe it's possible on Blender. It is possible to make a spotlight look ...
3
votes
1answer
215 views

Noise appears locked to the camera, as if looking trough a dirty glass [duplicate]

I am attempting to animate entering a theater on a foggy or rainy night: I used cycles rendering with a world volume setting of volume scatter to have the two spotlight cones appear as if they are ...
3
votes
1answer
479 views

How to show Point Density data in 3D viewport the same way a smoke simulation is visualised?

I'd like to visualize Point Density cycles node in 3D view with python. Something basic - iterate through all vertices or particles and draw a (voxel?) sphere for each of them. How is smoke ...
3
votes
1answer
327 views

Can I use Vertex paint with volume shaders?

Simple question: Can vertex paint be used with volume shading in Cycles? When you plug the vertex-colors into any volumetric node (emission, scatter absorption) and plug the output of that node into ...
3
votes
2answers
103 views

Bug? Voxel Data Animation Issue (Still Frame Number Keyframe not rendering)

EDIT: I found a workaround to this (see post below), however, the keyframe input with Still Frame Only, does not work. So I can only setup a scene of duration my number of frame in the texture. Any ...
3
votes
1answer
159 views

Subtle smoke under light ( eevee )

I know how to add volumetrically fog but I have no idea how to do this slow-moving smoke? that barely visible under light. above image is a sample only. thank you
3
votes
1answer
1k views

Volume Scatter is changing colour

I want to add fog to a blender scene (in Cycles), so I created a cube and applied a Volume Scatter Shader. I changed the color to white, but the cube is black now. When I change the color to red, it'...
3
votes
1answer
319 views

Volumetrics behind transparent objects in eevee

I have a scene where I want to put an object with a volume renderer under glass, but I've discovered that my volumes don't seem to render when they're behind a transparent object. I'm new to eevee, ...
3
votes
1answer
260 views

Blender Cloud Generator Edges

I am trying to figure out how to solve a rendering issue with using the Cloud Generator plugin. The image below is the result of applying the cloud generator (addon that comes with Blender) to a ...
3
votes
1answer
200 views

Efficient Rendering of Many volumetric particles

I am working on a research project utilizing blender to visualize realistic clouds generated from a Large Eddy Simulation. I've been able to do so in limited respects. These images, while pretty, ...
3
votes
1answer
620 views

Voxel Data texture in Blender (Especially for Cycles/EEVEE)

What I'm up to? I would like to render some CT/MRI data. The data is represented as a 3d array with float values. (Or a sequence of 2d images) My scheme As the blender manual describes, procedual ...
3
votes
2answers
630 views

Cycles displacement with Volume scatter

I'm not sure if it's a bug, but when I apply a volumetric shader in an object with adaptive subdivision+displacement, the final render on Cycles ignores the displacement. Render with surface shader (...
3
votes
1answer
469 views

Volumetrics data into mesh

Is there any way to convert volumetrics into mesh? I managed to recreate 3D structure from 177 serial images (confocal microscopy) using volumetrics, using guidelines found here I'm not satisfied ...
3
votes
1answer
526 views

How to create dynamic clouds?

Specifically dense clouds that move really slowly, just fast enough to be noticeable in a 15 sec animation. They'll need to be 3d, interact with some floating buildings and reflect the sky. I found ...
3
votes
1answer
508 views

Volumetric Scatter ignoring World lighting

I'm having trouble getting Volumetrics to respond to the World environment lighting. I'm using a standard node setup combining Volumetric Absorbtion and Volumetric Scatter and it appears to work as ...
3
votes
1answer
1k views

Animate floating dust particles

I wish to create some floating dust particles for animation using a thread here but that doesn't go into the animation part, only the look dev. Could someone tell me how to animate those particles to ...