Questions tagged [volumetrics]

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

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11
votes
1answer
1k views

How can I correct this beer material?

I have a beer setup in my blender scene. It's a basic glass shader for the glass containing a fluid mesh with a glass + volume absorption material with a tint. I don't understand why the fluid is ...
5
votes
1answer
823 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 ...
6
votes
1answer
3k views

How can I change the particles density and its direction in volume?

I'd like to have the number of particles greater in the bottom , and they get lower towards the upper parts of the cube, it's because I don't want them to spread homogenously. How can I make it I have ...
1
vote
1answer
1k views

How to create volumetric/smoke material in blender game engine?

I would like to create a hologram of sci-fi ship. I created materials in blender render and hoped, that they will be easily used in game engine too (my mistake). And I have been unable to create the ...
1
vote
0answers
1k 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 ...
13
votes
1answer
4k views

Render semi-transparent volume with cycles

I want to render an image of a fire in cycles, but as a png with a transparent background. Without a transparent background, the output image looks like this: But as soon as I tick the "Transparent" ...
7
votes
1answer
822 views

Horizontal lines showing in volume scatter shader

I am creating a landscape scene, and to get clouds I scaled a cube by a lot in x/y directions and set its material as follows: A quick render resulted in the following pattern: It is possible to see ...
3
votes
0answers
182 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 ...
7
votes
1answer
921 views

How to assign colors to Point Density based on data values?

I have a file containing approximately 900,000 x,y,z data points, each with a list of physical values at that position (temperature, density, chemical composition, etc.) I have written a Python ...
2
votes
1answer
1k views

I can not have environmental map and volume lighting at the same time?

I am doing a scene, where I need to have a environmental texture as the background,and that texture is called an equirectangular map. I also need to have a volume lighting in the world as well. But ...
3
votes
1answer
521 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 ...
10
votes
3answers
24k 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 ...
1
vote
1answer
342 views

Volumetric Lighting

I have Blender version 2.74, and I just can't find a way for myself to create volumetric light, I tried setting in world properties the Volumetric Scatter and then at the bottom enabling Homogeneous, ...
6
votes
1answer
5k views

Volumetric Spot Light with Cycles

I'm using blender 2.76 rc1 with an AMD Raedon HD 7900 series, I'd like to create a volumetric spot light with cycles render. I set the volume scatter (density 0.1) in volume and mist pass in world, ...
1
vote
1answer
2k views

cloud generator add-on with cycles

I'm trying to have a helicopter flying above some clouds. The most elegant way to create clouds that I've seen is using the cloud generator add-on that comes included with blender. When rendering with ...
1
vote
1answer
349 views

Rendering smoke and volume object which is emitting light causes black spots

I'm creating animation with shooting gun. I've created gun model, smoke emitter which is placed at the end of the barrel and muzzle flash - volume shader with emission. Everything looks fine until ...
6
votes
2answers
3k views

How to make an object transparent to the freestyle pass?

In Blender 2.75a, I'm making a render using Cycles and the Freestyle pass. My scene contains a mesh with a smoke modifier that I'm rendering through a volumetric shader. The boundaries of this mesh (...
7
votes
1answer
212 views

Is there a way to determine if a ray is coming from a volume?

I am trying to create a light that only illuminates volume scatters. The input > light path node has "is X ray" outputs for all the various types of rays coming off a surface. However I'd like ...
7
votes
1answer
1k views

Mulitple point density clouds - intersecting each other

for an animation I want to create a fluffy cloud scenery (with the internal render engine) To to this, I created severeal cloud shaped meshes- each of them got a particle system. Over that I build a ...
3
votes
1answer
3k views

Volumetric cloud render noise in Cycles

I'm rendering volumetric clouds using Procedural cycles Clouds shader. I'm getting a good result, but with a strange noise (middle bottom screen): It's about 180 passes. As you can see everything is ...
4
votes
1answer
2k 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 ...
9
votes
1answer
3k views

Create light rays in Cycles [duplicate]

I am trying to create something like volumetrics with a falloff: beams of light that shine visibly into the air from an emissive object, becoming gradually less visible as they get farther from the ...
2
votes
1answer
1k views

How to voxelize and extract blender data?

I am trying to use Blender as a CAD tool for electromagnetic simulations. I have modeled the geometry, but now would like to export it to a format that I can read for the simulation (external Python ...
16
votes
3answers
7k views

How to properly render smoke on a transparent background?

When rendering volumes with Film > Transparent enabled, the alpha appears to be the wrong type (premultiplied/straight). In the 3D view it works as expected: This is a known bug. Is there any way to ...
7
votes
1answer
599 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, ...
1
vote
1answer
2k views

How to make the light from the flashlight in Blender Cycles? [duplicate]

How to make the light from the flashlight in Blender Cycles? The Emission node doesn’t give volumetric light: I'll use it in animation, example: .
9
votes
2answers
11k views

How can I make a simple volumetric light on Cycles?

I'm trying to do a volumetric light on Cycles, and I've followed tutorials, but nothing has worked yet. How can I make a proper volumetric light in Blender, like the following one? But to leave the ...
4
votes
3answers
3k 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 ...
2
votes
1answer
124 views

Combine 2 Scenes / Volumetric Fog from BI to Cyles

I have a complex scene rendered in cycles and now like to add some volumetric fog rendered in BI. I have linked some objects from my cycles scene to a new BI scene and added a cube with a volume ...
8
votes
2answers
6k views

Scattering and anisotropy usage

Apart from artistic purposes, what are some practical uses of negative, zero or positive anisotropy? I do understand how it affects the scattering direction but I am not sure when is it useful.
25
votes
2answers
23k views

How to Create Dust Floating in the Air?

Quite impressed by all of Gleb Alexandrov's scenes with some amazing dust floating around. (To see what I'm talking about > http://www.creativeshrimp.com/lighting-tutorial-atmospheric-effects-dust-...
4
votes
1answer
471 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 ...
3
votes
0answers
184 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 ...
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 ...
5
votes
1answer
147 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: ...
9
votes
1answer
305 views

How to get the current step number in volume render

I need to get the current step number while rendering a volume object the step used for sampling the volume : something like in light path node " transparent depth , ray depth "
3
votes
1answer
12k 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 ...
5
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 ...
5
votes
1answer
5k 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 ...
7
votes
1answer
787 views

Render 3 dimensional scalar field

I have a function which assigns to "every" point in space (x,y,z) a scalar value d. I want to, somehow, visualize this function ...
2
votes
0answers
604 views

Transparent background hide volume emision (cycles) [closed]

Why transparent background option hide volume emission? I use Cycles render. Blendfiles: http://www.pasteall.org/blend/33111 http://www.pasteall.org/blend/33112
3
votes
1answer
6k 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 ...
8
votes
1answer
3k views

How to eliminate Cycles artifacts with many overlapping volumes?

I have encountered an issue with Cycles Volumetrics in a recent scene. I am using Blender 2.72, and both CPU and GPU render options. In both I get a solid black artifact when I have two volumes ...
9
votes
1answer
3k 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.
7
votes
3answers
10k views

How can a light cone (volumetric) be setup with cycles?

I tried to reproduce the results from the Docs on volumetric lighting unfortunately the video link is broken. And I might have overlooked some related settings. The spot light is barley visible on ...
3
votes
1answer
416 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 ...
4
votes
2answers
547 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 ...
2
votes
1answer
824 views

How to render in cycles volume with camera inside

I know there were tricks like cutting inside the volume object with another object with boolean modifier (this one I'd like to avoid) and another with putting the camera inside some sort of a bubble ...
6
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 ...
17
votes
4answers
4k views

Voxel data in Cycles

Is Cycles able to render voxel data from an external file? I can create the volumetric effects that I'm interested in by plugging a texture node into volume absorption and volume scatter shaders, ...

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