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 ...
8 votes
0 answers
155 views

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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8 votes
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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 ...
8 votes
0 answers
1k 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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7 votes
2 answers
480 views

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 ...
6 votes
0 answers
10k views

cycles stuck at loading render kernels

ever sense I have been using the new LTS version or a newer version of blender its not loading the render kernels or sometimes it will but its just painfully slow even with the default cube scene has ...
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5 votes
0 answers
448 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 ...
5 votes
0 answers
106 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.
5 votes
0 answers
645 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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5 votes
0 answers
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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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5 votes
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4k views

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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5 votes
1 answer
488 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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4 votes
0 answers
177 views

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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4 votes
0 answers
384 views

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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4 votes
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335 views

Understanding Memory Usage Whilst Rendering in Cycles

I am trying to understand memory usage whilst rendering in Cycles with a view to making good upgrade option decisions. I have a large scene which for my system is very heavy to render. I have 32 Gb of ...
4 votes
1 answer
180 views

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 ...
4 votes
0 answers
83 views

Optix rendering appears to actually be doing CUDA instead of Optix

Optix rendering appears to actually be doing CUDA instead of Optix. I selected Optix, but it takes the same amount of time to render as when I select CUDA. I have updated my Nvidia driver to version ...
4 votes
1 answer
634 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
4 votes
0 answers
300 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 ...
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4 votes
0 answers
537 views

Shrinkwrap an image to a cylindrical / slightly conical object with minimal distortion

I have some five gallon buckets of various different dimensions and artwork for a label that would go on them. I'm trying to figure out how I can show the label applied to a bucket accurately. The ...
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4 votes
0 answers
674 views

How do you render lines in EEVEE/Cycles

I am trying to convert my workflow over to Cycles/EEVEE since the Blender Renderer will no longer be available. A fair bit of my product is drawing lines or paths in the scene (such as below which ...
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4 votes
1 answer
2k 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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4 votes
0 answers
202 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 ...
4 votes
1 answer
3k views

Poliigon textures reflection map with PBR

At the moment Im using Blender 2.78. Im using Blender Guru's PBR Workaround for materials. In the scene I'm working on I use textures from Poliigon.com. In the Poliigon help guide it says that ...
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4 votes
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494 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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4 votes
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576 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 ...
4 votes
0 answers
588 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 ...
4 votes
1 answer
419 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 ...
4 votes
0 answers
2k 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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4 votes
0 answers
948 views

Can you link render settings across all scenes so they can all be changed at once?

I have multiple scenes to render and in my "master" scene I have set up the render nodes to output the render of all scenes. This way I only have to hit the Render Animation button once and all of the ...
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4 votes
0 answers
849 views

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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4 votes
0 answers
695 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 ...
4 votes
0 answers
2k 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 ...
4 votes
0 answers
125 views

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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4 votes
0 answers
953 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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4 votes
0 answers
785 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. ...
4 votes
0 answers
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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4 votes
0 answers
704 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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4 votes
0 answers
576 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 ...
4 votes
0 answers
554 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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3 votes
0 answers
55 views

Can I render simultaneously both with EEVEE and Cycles on the same GPU without perfomance loss?

Recently while rendering in EEVEE and Cycles I had a look on my GPU usage in task manager. Unsurprisingly when I looked at CUDA usage when using Cycles it was near 100%, while another tab called "...
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3 votes
0 answers
58 views

Blender Hair System uses different seed on different computers

I am trying to render a pretty complex hair setup on our local network of workstations with cycles X. I use 3.0.0. The machines all render to our production server with placeholders. Works fine ...
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3 votes
1 answer
47 views

Compositing transparency challenge. Particle not part of alpha?

Hey Wicked Smaht people! I have been working on a project that will be super imposed, in photoshop, over another image. So, I have been trying to composite it so that the background is transparent. ...
3 votes
0 answers
85 views

Aperture Science portals using OSL

I am wanting to create Aperture Science style portals, And I’m aware of various compositing techniques to do this, but to make it more flexible I am thinking about using Open Shading Language. I do ...
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3 votes
0 answers
161 views

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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3 votes
0 answers
161 views

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 ...
3 votes
0 answers
50 views

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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3 votes
0 answers
103 views

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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3 votes
0 answers
59 views

How to access new attribute types in render

It appears we can create arbitrary new attributes in blender 2.9: https://docs.blender.org/api/current/bpy.types.Attribute.html This is a great new feature, but I can't figure out how to access these ...
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3 votes
0 answers
44 views

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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