Questions tagged [cycles]

Cycles is a ray tracing render engine that can be used to achieve photo realistic results in Blender. It was introduced officially in 2.61. Use this tag for any Cycles related posts.

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7
votes
1answer
548 views

Can I use BSDF for the emission pattern of a lamp or light source?

I started to study blender because I want to perform some simulations on bicycle lighting. My goal is to take a picture of a beam pattern against a wall, then use it as the Bidirectional EMISSION ...
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2answers
8k views

Post-processing Lightsabers in Blender

I've been studying JamesVillanueva's lightsabers for a while now, and have tried to recreate the effects in Blender. The trouble I'm having is with the blade in the compositor. Keep in mind that I'm ...
2
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2answers
2k views

Is it possible to simulate Fluorescence in cycles?

It it possible to create a fluorescence shader in cycles? From Wikipedia: Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. More ...
5
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1answer
950 views

How to bake normal map identical to one from cycles?

In my project I have normal map defined by nodes in Cycles which I use to render my scene -- here are relevant nodes: Image texture is a seamless square normal map image. Later I also decided to ...
10
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1answer
5k views

How do you make a lamp light up glossy surfaces?

Working on a candle project to practice: Under the 'world' properties I have turned the strength down to 0 (thus making it pitch black). I then added a lamp to the workspace and adjust its strength ...
7
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3answers
3k views

Fade in action applicable to all objects (in cycles)

I am trying to make a schematic video about assembling a machine. For a lot of objects (bolts, etc...) I use the same delta location action, so they get assembled in their position. This allows me to ...
3
votes
2answers
749 views

Is it possible to visualize ray length info as a black and white map?

Prompted by my previous question, Is it possible to see the output of a node group like this one: (created from this tutorial on blender cookie) as a easy to visualize (and quick to render) black and ...
2
votes
1answer
286 views

Changing tile location

I want to be able to render a tile and then move to the left and render that tile Specify tile size for Blender Cycles rendering via command line So far I have gotten this... I have no idea how to ...
3
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1answer
1k views

Is it possible to get the length of a ray inside an object with nodes?

Is it possible to get the distance a ray travels inside an object with cycles material nodes? Then map it to a 0-1 range to create a map: E.g. to adjust the color of a Glass node to make it more ...
5
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1answer
2k views

How to preserve Cycles material colours when exporting to .obj format?

When I export .obj files from scenes that use Cycles (and thus, materials with nodes etc), the material colours are not preserved in the ...
4
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1answer
2k views

Can I get the object dimensions in Cycles?

Can I get these dimensions: (bpy.data.objects['Cube'].dimensions) in a Cycles node, as a vector? I tried an Attribute node with dimensions[0] as the Name, but ...
13
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1answer
2k views

Dot matrix display in Cycles?

Is it possible to make a dot matrix look with cycles? I attempted this with the following node setup: However, the dots should be round, and each dot should only have one color. As you can see, this ...
7
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1answer
20k views

How to use an object as a mask?

I have a 4 point plane (quadratic) that I would like to use as a mask when rendering.I need this so the mask will be transformed correctly when I move the camera. This plane is covering the area I ...
12
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2answers
3k views

Is it Possible to Create an Opalescence Shader in Cycles?

Is it possible to make an Opalescent shader in cycles? From Wikipedia: Opalescence is a type of dichroism seen in highly dispersed systems with little opacity. The material appears yellowish-red ...
4
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2answers
1k views

While in texture paint, make uv map edges visible (Cycles)

i'd like to see the uv map while texture-painting. But the uv map in the uv editor shows only if the 3d view is in edit mode. I've seen in a tutorial that the map can also be visible in texture paint ...
5
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4answers
11k views

How to save an image without antialiasing in cycles?

I think this question has been raised numerous of times, but I have yet not found an answer that works. I'm rendering game graphics with cycles and I need them to be saved in RGB, without any alpha ...
32
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2answers
25k views

What is branched path tracing and how is it useful?

I noticed recently that there is a new option in Cycles for "branched path tracing", can someone explain what this does in easy to understand terms? Should we expect faster render times or less ...
24
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4answers
13k views

Cycles hybrid rendering

The Cycles render engine can render both on the CPU and the GPU. I often render over-night so I do not need my computer to be responsive. Is it possible to render with Cycles using both the CPU and ...
35
votes
2answers
18k views

How can I create a convincing sea material in Cycles without using the ocean modifier?

I'm trying to render a sea scene animation, but using the ocean modifier and huge subdivisions isn't feasible due to the large scale. Luckily it's a calm sea and seen from quite a distance, but there ...
6
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1answer
221 views

Separate preview/render border settings possible?

I like to render using the cycles in the viewport. To speed things up I use the render border (Ctrl+B) to mark a small region of interest. However when actually render (F12) the border is still there. ...
5
votes
1answer
585 views

Render Animation on still scene, No BVH reloading

I have a scene I would like to do a fly-through on. There are quite a few polygons. This means that blender spends quite a lot of time loading the scene before it stars to render it. It should not ...
8
votes
2answers
6k views

Efficient way(s) to render point clouds of 3D scan datas in cycles

Problem: I would like to render a 3D scan data (so no volume) containing only vertices (no faces or edges) with colour informations in cycles. Tried so far: I tried particles (spawning spheres on ...
18
votes
1answer
27k views

How can I blend two textures together using Cycles?

I am trying to put dirty material over a concrete material in cycles. Now I am trying to do this using a color ramp and a mix shader, but I don't know if this is the only way or best way to do this. ...
22
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2answers
7k views

Shadowless render pass

I would like to have full control of the shadows in post production. That's why I would like to have A shadow render pass containing only the shadows of my scene A shadowless render pass containing ...
10
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1answer
6k views

How to find which materials use a missing texture?

Menu command File > External Data > Report Missing Files gives output such as: Warning: Path '/foo/sometexture.jpg' not found How do I discover which materials ...
5
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2answers
10k views

Best settings to reduce cycles memory consumption

I'm trying to render a very complex scene with blender and it seems to be using too much memory. I've already tried using tile size as a multiple of total resolution and spatial bvh splits. Can ...
6
votes
1answer
711 views

Why do normal map ridges become grooves in mirrored object?

My model has a pair of objects, one a mirror image of the other, like bookends or a pair of wheels. They use the same cycles nodes material involving a normal map. Ridges on the one object appear as ...
5
votes
2answers
5k views

Rendering freestyle lines in Cycles

I've been using BI to render objects as meshes using freestyle edges. I'm now trying to learn to use Cycles. Is it possible to render freestyle edges in Cycles? If so, how?
0
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1answer
5k views

Installing CUDA for Blender Cycles on Ubuntu 12.04 [closed]

Linux box (Corei7 920, 12 Gb RAM, 1TB hdd, Nvidia GTX 460) running Ubuntu 12.04. I'm enough of a noob that I've hit a wall of discouragement trying to install CUDA to take advantage of Cycles! This ...
12
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2answers
4k views

What is the workflow for compositing Fire/Smoke with Cycles

Since fire/smoke is currently only supported in the internal renderer, what are some good workflow ideas for bringing fire and smoke into a cycles scene. My current idea seems too labor intensive: ...
15
votes
1answer
11k views

Liquid / glass interface IOR and normals in Cycles

When modelling / rendering a glass with liquid inside (in Cycles), which direction do the normals for the glass only surfaces, shared glass-liquid surfaces, and liquid only surfaces point? I have ...
12
votes
4answers
2k views

Why does Cycles sampling give diminishing returns?

This may seem like a obvious/basic question, but I am still curious, and I don't know the answer. There will obviously be a big difference between an image rendered with a single sample and one ...
22
votes
3answers
31k views

Convert Cycles Hair Particle System to Mesh Object

I'm hoping this community can help me solve a issue. I have created a cycles hair particle system to render grass. This is successful in rendering and works great. However I want to convert this ...
22
votes
3answers
4k views

What are the technical differences between F12 render and viewport preview?

What are the technical differences between F12 render and viewport preview render, if any? This is all the documentation I could find about Cycles viewport rendering: interactive rendering can be ...
5
votes
3answers
2k views

How to get Cycles viewport output in compositing

I'm rendering with Cycles in the viewport (not with F12) and would like to get that viewport output as an input node into the Compositor. How can this be done?
9
votes
3answers
15k views

Hair won't render in cycles?

I just followed Andrew Price's video tutorial on how to render hair in cycles, and I have followed every single direction, but no hair gets rendered. Is something not enabled or activated? It is ...
2
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0answers
95 views

Use multiple UV maps in Cycles? [duplicate]

I want to define two different UV maps for one object. One will have the nodes pushed around to match features in an image for dents and scratches, intended to affect the displacement of the material....
8
votes
2answers
2k views

Using a mapping node to disable tiling is streaching texture?

I'm having a bit of an issue getting started with UV mapping in Cycles. It works fine initially, but when I add the mapping node and set min/max to the default values to turn off repeating, I get the ...
11
votes
3answers
8k views

Is it possible for a emission shader not to cast shadows?

Is there an option, like on lights sources, to tell the object that has an emission shader to not cast shadows in the scene?
8
votes
1answer
2k views

Is it possible to use the output of a Renderlayer in the material nodes of another RenderLayer?

Is it possible to use the rendered output of one renderlayer in the materials on another render layer? How can I achieve this?
6
votes
1answer
868 views

Difference between the scale and the size of a light in cycles?

To adjust the shape of area light in cycles, there is the Scale, or there is size in the light properties. What is the best way?
3
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0answers
2k views

Holographic Material - Cycles [closed]

How would I create the following in Cycles: Holographic Material - Video In Blender there is no Mograph Alternative so not sure how to build the spatial animating sphere effect. Hopefully no ...
7
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1answer
2k views

Microscopic Material in Cycles

How would I make this material in cycles? Thanks
43
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6answers
33k views

How to illuminate the darkness inside glass objects in Cycles?

My model has a clear plastic (or glass) dome with objects inside. The objects appear dark. I've tried the glass shader with color 100% RGB, with very small IOR, and using just a refraction shader. ...
13
votes
3answers
10k views

Creating volumetric lighting (crepuscular rays) in Cycles

Crepuscular rays (a.k.a. "god rays" and many other names) can be created in Blender Internal by checking the Halo checkbox in the lamp properties box. How can I create a similar effect using Cycles?
5
votes
2answers
2k views

Change Image sequence frame only every nth scene frame?

Is it possible to only change the frame on a image sequence on every nth scene frame? For example, if I have a 6 frame image sequence, and I want it to last 30 frames, It should only change to the ...
13
votes
3answers
2k views

Transparent motion blur in Cycles

I'm rendering an animation with motion blur (Shutter: 0.7) of a flyover of a bridge with moving cars on it. The problem is that the cars get transparent as seen in the image. Can this really be the ...
6
votes
1answer
713 views

Using wrl data in Cycles

I'm importing .wrl data from matlab that I would like to display. When I'm using the Blender render, I can see the colors as I wanted ( the object already has a ...
12
votes
1answer
5k views

What is the Reason Cycles Creates Incorrectly Colored/Firefly Artifact Pixels?

When it casts a ray, shouldn't it calculate the color and return that? Why would it create incorrectly colored pixels?
20
votes
2answers
6k views

Why can't cycles cast one ray per image pixel, instead of rendering progressively to infinity?

I am wondering why Cycles renders progressively to infinity. Why is it not possible to do one ray per pixel in the image, letting you have a finished result with ...