# Tag Info

Accepted

### Volumetric Windows 10 logo effect

Emulate light scattering using a volumetric emission shader Using Volumetric scatter produces the most accurate results but required a considerable number of render samples to get satisfactory ...
• 44.9k
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### Volume Gods rays are not well defined

Because your light source is too big. God rays are just interesting/complicated shadow patterns hanging in space. If your light is throwing soft, boring shadows, the god rays of those shadows hanging ...
• 9,132
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### How to: Exponential Fall Off for Volume Density?

You can use Vector maths and Maths nodes to calculate the 'altitude' above the planet and from there the atmospheric density and use this to control the density of the Volumetric Scatter. To achieve ...
• 44.9k
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### Create procedural spiral pattern

Final result One method is to create a volumetric cylinder and distort it by rotating it around the origin by an amount that varies based on the distance from the origin. First, create a volumetric ...
• 44.9k
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### Create a gradient effect, like for coffee?

This can actually be done quite easily (and efficiently) using the volume absorption shader: You're correct that this is a volumetric effect - it's dependent on how far the light travels through the ...
• 9,132
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### Distance from the surface as an input node for use with volumetric materials

You can use an OSL shader that measures the proximity of the mesh from within a volume. It works by projecting out rays from each point in the volume to probe the surrounding mesh. Be warned that this ...
• 44.9k
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No, you are confusing volume samples, volume bounce depth, and ray-marching steps, which are all different controls. To start with, a short overview of how volume rendering works. As a ray passes ...
• 9,132

### Using image sequence of medical scans as volume data in cycles

You can use an osl shader to do that. The code in the capture above creates an osl node. Here are its inputs and outputs : The input slots Vector : the mapping position (in this config, this must ...
• 60.5k
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### Using image sequence of medical scans as volume data in cycles

If you don't want to use OSL as in lemon's answer I have created a method to do this using only Cycles nodes. (Remember OSL isn't supported on GPU.) The downside to my method is that it requires the ...
• 25.2k
Accepted

### Creating a Fluffy Cloud

Here's what your file looks like rendered with the Sun lamp strength set to 4 (it was set to 1): The key to having a good "fluff" is a wide dynamic range. Dynamic range is the distance between the ...
• 158k

### Volumetric Windows 10 logo effect

You should look at the sunbeam node in the compositor - after render, you can add several filters and color mix nodes, but a really good way to get this effect seems to be with the sunbeam node to ...
• 8,508

### Emission: Red glow while the object itself is white

If you really want to use Cycles: Add a box which encloses the entire scene, add a principled volume shader to the box and play with Density and Anisotropy: In comp you can add a Denoise node to save ...
• 7,422
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### Emission: Red glow while the object itself is white

From a physically based rendering point of view, the problem you are running into is that Blender's HDR tone mapping is trying too hard to be helpful. The effect you see in the reference image occurs ...
Accepted

### God Rays through window pane: Cycles

Use a cuboid to surround the scene, and use a volume scatter node as volume. Nothing shoud be connected to the surface socket. The default value of 1 for volume scatter is way too dense for practical ...
• 14.1k
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### How to achieve white "fog" effect within an ice cube?

Here's a try using point density for the fog effect. There are two cubes in the image, I just beveled them slightly, the outer cube's material is basically a glass setup, except that I used an image ...
• 12.4k
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### Create a trail effect (Meteor, Comet)

With current experimental build 2.91 you can base this on Volume Object. create the shape from a Mesh Object. add Volume Object and in modifiers choose Mesh to Volume, as source Object choose created ...
• 36.8k
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### Volumetric slicing in Blender

You can get a similar result with a Boolean modifier Create your slicing planes (you can array them using Array modifier) Add a Boolean Modifier > Intersect to your object Target the slicing ...
Accepted

### Colours in OpenVDB volumes

The Principled Volume shader automatically picks up some details from attributes (eg, 'density' or 'temperature' and the Blackbody input can use this to generate the volume. This means it's not ...
• 44.9k

### How to create a hologram projection with light rays?

Here's the result I got: And here are my nodes: Note: the Translate and Scale group nodes are homemade equivalents of the corresponding parts of the mapping node. They are explained here. I am ...
• 25.2k
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### Displaying airflow inside of an engine model

Smoke seems like the correct medium to display airflow. Since Blenders smoke does not support suction, you'll have to fake the flow using multiple Forcefield. Model a simplified collider and mark it ...
• 27.2k

### Emission: Red glow while the object itself is white

That's actually quite challenging. I wonder if the maker of your reference image used some compositing. At least I think separate lights were used for the background objects. And to answer your ...
• 7,422

### Simulating neon: Find angle between two vectors with shader nodes

Much the same method as yours.. A geometry-bevelled curve for the glass, with a Solidify modifier to make it a tube. A duplicate of the curve, with a smaller bevel, for the gas. The glass is just a ...
• 78k
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### Why does refraction + volume scatter cause a much darker result?

Solution Set Properties panel / Scene / Bounces / Volume value to at least one. Explanation Probably your volume bounces is set to zero because it is the default setting. That means only direct ...
• 3,734

### Procedural volumetric texture generated from a script

If the available Maths nodes aren't up to the job of creating your required procedural volumetric you can use OSL to create a new shader node to generate your volume. OSL is based on C/C++ syntax and ...
• 44.9k

### Cycles: Generate 3d coordinates before modifier stack is resolved

It can be done! Approaching it on a Surface Before we try to do this with a 3-dimensional texture, let's attempt it in 2-dimensions. This is actually fairly straightforward. We can create a proxy ...
• 4,483
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### How to make fog in Blender

So lets go on buddy... ...as You could see on the picture above, we have a few steps ahead. 1) Activate MIST in the Render Layers / Passes as could bee seen in the center of the image. 2) Choose ...
• 534