Questions tagged [cycles-render-engine]

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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Floating point precision problem with transparency?

I guess this is a question of understanding, but perhaps I'm overlooking something which might solve my hassle with rendering of objects with transparency in cycles. I'm working on a project with ...
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how to write a custom projection type?

Is it possible to create a lens shader with EEVEE/Cycles ? I'd like to have the control over the camera position and the ray direction per sample. This allows to simulate various conventional lens ...
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Cycles Renderer - Updating Shaders and Images Every Frame?

This question is more of a curiosity to the potential of increasing render times, however, after finding very little out about this anywhere else, I am thinking it may be an intentional feature. I am ...
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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 ...
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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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1answer
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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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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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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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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 ...
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537 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 ...
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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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2answers
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Why does this add shader create so much noise?

This question is based on the shader in this answer. When I render the scene using plain glass for the material ball, it takes about 500 samples to converge. Here is the node setup and the result at ...
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1answer
452 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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1answer
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How to cast/teleport a ray in a material for a squinching illusion?

In short I'm wondering if there's a way to not only refract a ray, but also moving it, or somehow cast another ray from a different position in a material shader for an illusion I'm working on. This ...
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Creating CMYK Printing Simulator/Shader

Out of curiosity, I wanted to see if I could develop a quick little CMYK print shader in cycles. So that I could plug different images in to the shader and have it display as if it had been physically ...
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How to write EXIF data in rendered images?

I'm trying to render an image in cycles. version 2.83.5. trying to write metadata or Exif data into the image. In the output channel, I ticked every box on metadata. But I didn't find the EXIF data ...
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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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1answer
408 views

Fluid simulation only shows the domain

I was making a fluid simulation, but when I try to bake it, it only bakes the domain. The fluid doesn't appear from the inflow. Do you know why? Thanks. This is what appears when i render
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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 ...
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433 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 ...
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1answer
1k 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 ...
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154 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 ...
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420 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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543 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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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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How to create an all-around night sky in Cycles?

So I created a night sky following this video https://youtu.be/9vbq6HOgA2w It was going pretty well until I noticed that only half of the world actually looks decent. The bottom half/ middle is this ...
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How can I render a proper normal pass for smoke in cycles

I would like to render a normal pass for smoke in Cycles like this one: I'm aware of this method mentioned in Blenderartists but the result is far from the result needed to relight in post (via ...
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643 views

Copy node tree from one material to another in cycles using python

I have two cycles materials (say source and target). I want to copy the Shader Nodetree from the source material to the target material after clearing any currently present node tree(s) in the target ...
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Make object not receive cast shadows

I know you can make an object not cast shadows on others by disabling Shadow in Ray Visibility. But how can you make an object not receive shadows cast by other objects?
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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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Is there a way to get the vector to the closest UV seam?

I am looking for a way to get the distance to the closest UV map seam in UV-space as a vector in the node editor. Like this: The blue dot is the current point of reference, i.e. the point where the ...
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924 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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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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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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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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531 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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541 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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Recreating colored glass shader from VRay/Max to Blender/Cycles

Edit: Blend file: I am converting a somewhat simple scene from 3DSMax/VRay to Blender/Cycles. I'm almost done with the conversion, but I am having trouble with matching the glass shader used in the ...
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Blender hair in viewport looks nice and in render deformed

Essentially that's it, I have styled the hair and everything and my viewport is set to display the same amount of hair as in the render, so I was expecting the same shape as in the render, but when I ...
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Odd shadow cutout

I'm very new to Blender (10 hours in!), and I'm coming across a problem I haven't been able to successfully google. I have an object casting a shadow on a plane. I'm using an Area light pointing ...
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How to stabilize Random Per Island for Meta Objects

I have a very basic AN setup where I vector jiggle the position of meta ball instances for a lava-lamp-like motion. I wanted to change the color as soon as an individual Meta Ball disconnects from ...
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Is it possible to shade objects in Cycles based on Z gradient, to highlight/darken edges?

I'd like to shade the edges of my objects darker, like a toon shader, based on abrupt Z depth transitions to neighboring pixels -- in other words wherever the Z gradient is high, darken the image. I ...
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Weird refractions appear when I use the Emission BSDF with Cycles

Im working on a material for a visual effect i want to recreate. It divides the surface of the object into squares where some light up randomly (comparable to this: https://www.youtube.com/watch?t=16&...
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Accessing the Render Engine Type as a String from a Driver Expression

I am trying to make a Render Engine switch for node-trees, that will give control over ignoring or using certain node-chains depending on what render engine is used. This is basically an improvement ...
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Cycles - How to transfer information from a shader to another non-destructively ? (no baking)

How can we non-destructively (witouth baking anything into vertex color nor bitmap) transfer information from one shader to another within cycles ? Here's an example : Here is a simple proximity ...
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1answer
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Blender 2.82a cannot use CUDA or OPENCL

I am running into an issue that I am unable to solve! I am using blender 2.82a, I have an NVIDIA GT630 installed in my system, and am using Ubuntu 20.04. I want to use my GPU to render my scene, but ...
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Custom vertex attributes?

I would like to define a vector-valued custom attribute at each mesh vertex. I would like to define a vector direction at each vertex, and use the interpolated value across the face for anisotropic ...
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Cycles and EEVEE strange polygon problems

to the point: Why are polygons visible when rendering on cycles (Attention to the wheel), but not on eevee? hdri is same on both renders. The wheel has a smooth shade. In solid mode, everything is ...
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Black squares showing up in render

I’m following a tutorial right now and I have a problem with my final renders. I’m using open cl with my AMD RX 5700 XT and AMD RYZEN 7 3700X since it faster, but the problem that I found out that is ...
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How can I model this Body in Blender?

Hello Blender Community, I am new to Blender. In the past, I only used CAD Programs (Inventor, Fusion 360). Because of the Rendering and Animation, I try to recreate my models in Blender. One of my ...

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