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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How does anti-aliasing work in cycles?

As far as I understand, cycles anti-aliasing in cycles (per default), works by sampling around a specific arc/vector determined by the camera position/rotation. This explanation and my experience ...
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1answer
438 views

Fluid Domain disappears in cycles viewport render

I'm experiencing this weird behavior with a fluid domain. It looks like something is occluding the object whilst there's nothing else in the scene. Even if I apply the FluidSim modifier, I still ...
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1answer
1k views

Toon Shader Cycles- Change Color of Shadows

I made a character for a mobile game in Blender, Cycles, and i used a toon material as shader. Now, for each toon material i create, i used an 'Image Texture' as a color gradient. I like the result, ...
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Blender on Windows is skipping python script. (brenda on windows)

We've been using Brenda for quite some time now for rendering architectural stills. Since our editing stations are doing nothing at night, I started making a desktop app that allows you to pick jobs ...
7
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1answer
2k views

File format changes from MPEG to .DVD

I have an issue with rendering an animation. I set the file format to mpeg but when it finishes rendering the output file that it gives me is '.dvd'. How do I solve this problem?
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110 views

Copy scene node tree to other scenes

I have a Blender file wih many scenes and I want to copy the node tree of one of them to the other scenes. From Blender interface it is a very simple task, in python I have tried using bpy.ops.node....
6
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1answer
923 views

Antialiasing textures in cycles (Blender 2.77 and higher)

I would like to get an answer to a frustrating question. https://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.77/Cycles In this link is "Anti-Aliasing is now enabled for baking. (c359343)" ...
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2k views

How to get actual rendering progress and estimation from render_stats python handler?

There is render_stats bpy handler It seem like it is invoked every time rendering engine prints to console smth like ...
5
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1answer
414 views

Force Cycles GPU rendering for a Render Farm

So basically I'm on vacation for 2 weeks with a laptop without a CUDA device. I do have access to a render farm with GPU rendering support. Now the problem is that I can't setup blender to render in ...
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102 views

Is there any way to get single pixel wide aliased lines?

I'm trying to get clean, one pixel wide lines on my renders like the pic below, but nothing I try seems to work. I've tried freestyle with one sample, but I get extra pixels at some parts of the ...
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87 views

Optical flow generated from cycles render is not proper

Scene generated from Blender, and flow is given. As it can be seen the flow generated is not proper, it is in a zig-zag format. I see the scene at and above horizon have more zig-zag. Can someone ...
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35 views

Determining if Cycles light rays provide direct illumination or self-shadow

I am looking to render Saturn and its rings. The sun illuminates the diffuse material of the rings on their sunlit side but their backlit side needs to have an emissive shader. However the rings must ...
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239 views

Visualizing 3D voxel data in Blender 2.8

right now I'm trying to visualize my scientific 3D data in Blender 2.8. So blenders built in textures or smoke simulations do not lead to the goal. I've read that older releases of Blender do support ...
4
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1answer
2k views

Shader to RGB in Cycles

Eevee has introduced a new node, the Shader-to-RGB node. I find this quite useful for using the outputs of shaders in, say, the factor of a mix node or other such things. Unfortunately Cycles does not ...
4
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1answer
6k views

Bake in Blender 2.8

I have a small problem with the new Blender version 2.8. I wanted to bake some gauges with pre-applied textures (digits, aluminum and some basic colors). The problem I have, is that it will not bake ...
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3k views

How can I bake a normal map with smooth, beveled, edges, when the low poly has sharp ~90° edges?

Background I have been trying to solve a seemingly simple problem with normal map baking in Blender 2.9 since last weekend. I wanted to make sure that I read and researched as much as possible before ...
4
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1answer
507 views

Hair partially disappearing in render after combing

I got a weird problem. Patches of hair on a rug for a bathroom scene are disappering in my render, but only if I entered particle edit Mode and combed the hair before. So, I start out setting up my ...
4
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157 views

How do I colour a fluid simulation in Cycles based on velocity?

I want to assign a gradient to the water simulations I have. I want to do this by the velocity in the current voxel, so the fastest moving areas will be red and the slowest blue. How would this be ...
4
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306 views

Particle Instance Modifier : colour each instance based on the emitter texture (like Hair strands materials do)

In cycles, with particle hair strands, I can get the colour from the texture of the emitter object for colouring the entire strand. When I use the "Particle Instance" modifier on a mesh (a simple ...
4
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0answers
291 views

Using Particle systems on an Array Modifier's Cap

I'm new to Stack Exchange, but I've been using blender casually for the past year, or so I'm currently working on a city, for the purpose of learning and fun. To save myself from building a lot of ...
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492 views

Nvidia GPU not showing as Compute Device for Cycles

I have a question concerning my GPU Cycles Compute Device. I am running MacBook Pro 10.12.5 with a NVIDIA GeForce GT 650 M. I have done my research a bit and stumbled upon a confusing area. I ...
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2k views

nVidia skin shader with the Principled BSDF

I've been using a skin shader primarily based on the Brecht skin shader, which is itself based on the Sum-of-Gaussians approach as seen in 14.4.7 from GPU Gems by nVidia. Its Cycles adaptation, which ...
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950 views

Render on Tesla K80

I'm trying to render on a Tesla K80, but it doesn't work. blender --debug-cycles outputs ...
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910 views

Seamless Procedural Texture in Polar Coordinates

I've written a Cycles node tree to convert rectangular (X,Y) to polar coordinates (R,theta) as the basis for a procedural texture with radial symmetry. However, there is a seam in the texture where ...
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1k views

Synchronizing object in Cycles

I have a model of a butterfly that uses a displacement map for most of the detail on the mesh at render time. To get an accurate render, I have it subdividing 4 times for the render before applying ...
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906 views

Setup network render for cycles render on LAN

I am trying to setup network render with cycles as the rendering engine. My use involves rendering hundreds of images and I have already written logic for it in python which is working fine on single ...
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523 views

How to implement a new BRDF in Cycles

I want to implement a new BRDF in Cycles. I've already tried to code an OSL node but I couldn't because the way that BRDF closures are implemented in OSL seem to only permit BRDF closure composition. ...
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3k views

Alpha transparency not showing in cycles viewport

Using cycles I have simple cut out people in the scene: planes with .png textures on them. The transparency shows in the material editor and is rendered correctly but is not displayed in the viewport. ...
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616 views

How can I use a node-based texture for smoke flow in Cycles?

Preface: I'm thinking that this might be a bug, because the behavior's pretty weird. I'm posting it here in case it is the intended behavior and there's some trick I should use. I can successfully ...
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0answers
442 views

Why is this happening when I bake physics to keyframes?

So, I'm trying to do some stuff with physics and cell-fracture, and I need motion blur. When I bake the physics and render w/ motion blur, the objets aren't in the scene. So I tried baking the physics ...
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515 views

Dynamic Paint Brush Erase doesn't work in Render Output

Got some problems when trying erase colors with a Dynamic paint brush. I have plane which is affected by particles Dynamic paint brush (surface & color). When I try erase some spaces on the plane ...
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0answers
39 views

is there any way to get to velocity of a fluid and use it in the cycle material editor

I'm trying to use flip fluids to make lava is there any way to use the motion blur vectors, or get the velocity to mix a material. or in the script editor is there anyway to drive that.
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58 views

Vertex colors with skin modifier

I have some curves that I want to render in Cycles; these are not blender curves, instead they are composed of a set of vertices, each having a color, and edges (but no faces). Using the skin ...
3
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1answer
219 views

2.8 Cycle Render Mode ignore Local view mode

When I try to preview an Object in Local View with Cycles, all my objects are rendered together. It seems that Cycles ignores Local View. Is it a bug or is there another method/shortcut for it?
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163 views

Cycles Render, Looks wrong in Render ViewPort, correct in Material ViewPort

Using Cycles Render! Have tried things for hours on end and can't figure it out, please help! I simply want to bake the texture from the Material Viewport, but it continues to bake the looks of the ...
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55 views

How to remove unwanted refraction (bent-straw illusion) from cycles material?

I am working on a render of Saturn as part of a scale model of the solar system, and have run into a problem with the transparency of the rings. I am using an alpha-mapped png image which seems to ...
3
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0answers
231 views

Rendering with OpenGL in Blender does not show the intended rendered image or animation

I am trying to render animations and images fast using the OpenGL feature in Blender but even though I want it to render a fully rendered image or animation, it only renders the solid image, or the ...
3
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0answers
63 views

Light / Mesh inconsistency in one area - Cycles

I'm trying to understand what's wrong with the lights in my scene. I've made some kind of sci-fi corridor, inspired by the interior of an aircraft cabin. The main mesh is first mirrored and then ...
3
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0answers
66 views

Setting particle color with generated m x n image texture

I have a large particle system in which the particles (stars) are colored according to a generated image texture. The image texture was originally 119,617 wide and 1 px high. No matter what I did, ...
3
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0answers
189 views

Artifacts when rendering irregular mesh in Cycles (black lines)

when I render with Cycles any mesh (specially planes) with a bit of irregular shape (by using previously, for example, a displacement map) some black lines appear on it. Those black lines are not ...
3
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0answers
195 views

Nodegroup: Missing data block

A Cycles node group in a file of mine seems to have lost its data block somehow. The group still shows its inputs and outputs properly, but the name of it has changed to Missing Data-Block, and no ...
3
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0answers
236 views

GPU Rendering Stopped Working

I was using GPU CUDA rendering with Cycles and it was working fine, but part way through the render it stopped working and I had to continue the render with the CPU. Now the "GPU Compute" option in ...
3
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0answers
219 views

Strange Rendering Behaviour…Branched Path Tracing

I started rendering with Branched Path Tracing after learning about the benefits. However, after waiting for hours for a render to finish, the renders always end up with some blocks looking like they ...
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0answers
83 views

Why is there a difference in coordinate system Cycles obj normals vs. Blender Render obj normals?

Baking normals of a geometry in Cycles and in Blender Render results in two different colours (coordinate systems), although both are set to "object space". When I calculate normals with C++ code, I ...
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0answers
94 views

Strange light from glass

I'm doing a scene with a room with a table. On the table I have some wine glasses, but I get this strange light from some of them. The glass to the left looks OK, but the other are not OK. It seems ...
3
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0answers
453 views

Is there a way to solve terminator artifacts?

Has anyone found a way to fix the problem? Increasing the subdivisions the artifacts remains, less visible because the polygons are smaller. I have also attached Arnold image (Redshift is very similar)...
3
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0answers
150 views

OpenCL GPU rendering with AMD Carrizo?

I just got a new laptop that said it had the AMD Radeon R7 mobile graphics in it. Ubuntu recognizes it as "AMD Carrizo", and Blender 2.79 doesn't have the "OpenCL" GPU rendering option in the System ...
3
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0answers
224 views

How to apply a after-render 2-D image filter on cycles shader?

I'm interested in the implementation of the polka-dotted non-photorealistic shading in this video in Blender. I know how to code the filter if I have the final rendering result (image) seperated by ...
3
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0answers
312 views

black displacement artifacts using micro-displacement and adaptive subdivision

I am currently using micro-displacement along side with adaptive subdivision. However I have stumble upon a weird artifact. As you can see there are some black pixelated artifacts along side the ...
3
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1answer
295 views

Mesh emission strength to Area lamp strength

I've three emissive mesh planes in my scene which I'd like to convert to Area lamps. I've set my new Area lamps to use precisely the same size, location and strength as the planes were. But when I ...