K-Cycles

by K-Cycles in Scripts and Addons


Exciting New Feature: K-Cycles Ultra Lighting (See Video Below)!

Recently added features:

Ultra Lighting - Most complete and powerful lighting system for Cycles (3.2).

Animation Denoiser.

Mist PostFX.

Mask PostFX.

Now available with K-Cycles 3.01 stable, 3.12 stable and 3.2 beta.

Previous K-Cycles 2021 users can use upgrade code "upgrade2022" (Extra 20% off) discount.

What is K-Cycles?

K-Cycles is a highly optimized custom build of Cycles-X render engine, ultra lighting, post FX, ultra denoiser and realtime viewport lighting and effects for Blender. It is fully compatible with Cycles and designed for Nvidia GPUs. Features include:


  • Ultimate rendering performance for viewport and final renders.

  • Amazing Ultra Lighting the most powerful and complete lighting features for Cycles.

  • New Ultra Denoiser with the latest Intel denoiser technology and multi pass for clean and super sharp images.

  • Ultra Denoiser works inside Blender without needing the compositor and has great performance avoiding complicated compositor nodes.

  • Animation Denoiser uses the latest OptiX temporal denoising to improve animation render times up to 2x.

  • Even faster renders using intelligent scene and settings optimizations preset modes with higher K-Cycles performance while still maintaining good image quality.

  • Amazing viewport Ultra Lighting, Post FX including BLOOM effects, FLARES with glare, anamorphic and ghosts, Tone Mapping and Lens effects that elevates your art to the next level.

  • All K-Cycles Ultra Lighting and Post FX effects are animation ready with all the settings fully keyable and with previews on the viewport.

  • The K-Cycles Ultra Lighting, Post FX effects can be done in the viewport or final render both in GPU or CPU.

  • Cycles image quality with less render noise.

  • Fully compatible with Cycles and all Blender addons.

  • Regular stable release and alpha builds updates with the latest features from the Blender.

  • One version optimized for both Optix and Cuda.

  • Easy to use without the need of changing Cycles settings for fast performance.


Ultimate Lighting, Post FX, Denoiser and performance for your Cycles rendering!


Hi, I’m Eric Klein. Some of you may know me from the Blender forums and my focus on creating the most photo-realistic renders possible in EEVEE and Cycles.


I have spent a lot of time on how best to obtain near photo results, with the purpose of speeding up my Archviz interior renders with EEVEE and Cycles. I found Cycles renders to always be better. And of course with Cycles, it’s mostly just pointing the camera and taking a picture– no elaborate steps necessary.


So, for the past two years, I’ve set about creating my own version of Blender, and relentless testing using various settings and optimizations, all focused towards creating the most powerful, complete features and blazing fast Cycles and now Cycles-X rendering, and in many cases it can even compete with EEVEE render times.


Video on K-Cycles Overview:


Who is it for?


K-Cycles is for Blender users who want to speed up their Cycles renderings and improve image quality using the best ultra denoiser and viewport/final render Post FX effects. With it’s automatic “K-Cycles Intelligence,” it is a breeze to use and needs virtually no ramp up time. Just launch it and start rendering. And there are a number of non-destructive presets to work with as well.


K-Cycles is tested with many of the top addons, including Hard Ops, Boxcutter, KIT OPS, SYNTH and many others. It is updated regularly and includes updates to the latest alpha releases.


Why K-Cycles?


K-Cycles is for Blender users who want to speed up their Cycles viewport and rendering and bring art to the next level with ease and immediate results. Using the powerful ultra lighting and Post FX effects both viewport/final render with amazing sharp ultra denoiser. It’s intelligent preset modes

is a breeze to use and needs virtually no ramp up time. Just launch it and start rendering.


K-Cycles is tested with many of the top addons, including Hard Ops, Boxcutter, KIT OPS, SYNTH and many others. It is updated regularly and includes updates to the latest alpha releases.


Plans for adding even more features to the K-Cycles engine. Stay tuned!

What is K-Cycles Ultra Lighting

  • Interactive real-time viewport and final lighting workflow.

  • Ultimate Lightgroups features with ease of use.

  • Solo preview lightgroup mode.

  • Remainder lightgroup mode.

  • Complete accurate lighting setup.

  • Real-time light mixing for viewport and final render

  • Light linking in real-time with many options.

  • Tone mapping per lightgroup.

  • Full and fast denosing for all the lightgroups.

Ultra Lighting

The most complete and powerful lighting system for cycles. Lighting is critical in bringing your art to the next level. Using ultra lighting features like lightgroups, light mixing, light linking and tone mapping lightgroup with ease of use to get amazing lighting results. Fully denoise lightgroups layers to continue work in the compositor if needed. See below all ultra lighting options:


Video on K-Cycles Ultra Lighting:




What is K-Cycles Animation Denoiser

  • Uses the latest OptiX temporal denoising technology

  • Improve animation render times by 2x or more.

  • Easy to use interface.

What is K-Cycles Ultra Denoiser

  • New Ultra Denoiser with the latest Intel denoising technology.

  • Multi pass feature for noise free and very sharp detail.

  • Has amazing detail at very low render samples.

  • Artifact free and smooth volumetrics.

  • Works inside Blender without needing the compositor.

  • Has great performance avoiding complicated compositor nodes.

Ultra Denoiser

Using the best denoiser technology with the addition of Multi Pass. Get great results without the compositor. Noise free and sharp images at very low render samples save valuable rendering time. High quality volumetrics and great performance inside Blender.


Example of the Dark Interior by Entity Designer.


Denoise with Cycles-X at 9 render samples:



Using “Ultra Denoiser” with Multi Pass at 9 render samples:


Example of volumetrics from the Hall Scene by GREEZEBEAR.


Denoise with Cycles-X at 16 render samples:


Using “Ultra Denoiser” with Multi Pass at 16 render samples:



What is K-Cycles Flares

  • K-Cycles Flares is the only Cycles lens flare implementation in the viewport.
  • Lens flare types include glare, anamorphic and ghosts effects.
  • Flares are physically based on light brightness, size and color.
  • K-Cycles Flares have many artistic controls to create all types of amazing flare effects.
  • Animation ready with all the settings fully keyable and with previews on the viewport.
  • Works with Cycles "Sky Texture” like Nishita and others, commercial sky addons, HDRI’s, or real and emission lights.
  • EASY to use and design to give great results without the need of Photoshop or compositor.

Flares effects on Cycles viewport preview and final render!

Dynamically interact with the scene in the viewport. Adjusting quickly the lens flare settings with fast performance in the preview render viewport. Create great lens flare effects as seen in movies, tv shows or photographic stills. Improve the visual quality with realism to your art with Flares effects with speed and ease of use. The Flares settings have the most useful options that are needed for your image to stand out or have the final polish without the need of Photoshop or compositor right in the viewport.


Vanke Future by 3D Shaker - Render with K-Cycles Flares and Bloom:


BMW scene K-Cycles Flares and Bloom:


Video on K-Cycles Lens Flares:



What is K-Cycles Lens

  • K-Cycles Lens is the only Cycles Lens effects implementation in the viewport.
  • Lens allow you to add realism to your scene with lens and photographic effects.
  • EASY to use and design to give great results without the need of Photoshop or compositor.


        Lens effects on Cycles viewport preview and final render!

        Dynamically interact with the scene in the viewport. Adjusting quickly the Lens settings with fast performance in the preview render viewport. Improve the visual quality by adding lens and photographic effects with imperfections to your scene. Add a new level of realism with Lens effects with speed and ease of use. The Lens settings have the most useful options that are needed for your image to stand out or have the final polish without the need of Photoshop or compositor right in the viewport.

        “Monster Under the Bed” scene by Metin Seven adjusted with K-Cycles Tone Mapping and Lens effects with distortion, chromatic aberration, vignette and film grain for a more photographic and realistic image:

        Video of K-Cycles Lens Effects:


        What is K-Cycles Tone Mapping

        • K-Cycles Tone Mapping is the only Cycles Tone Mapping implementation in the viewport.

        • Tone Mapping controls allows you to create a more dynamic scene or change the mood of the scene in no time.

        • EASY to use and design to give great results without the need of Photoshop or compositor.


        Tone Mapping effects on Cycles viewport preview and final render!

        Dynamically interact with the scene in the viewport. Adjusting quickly the Tone Mapping settings with fast performance in the preview render viewport. Improve the visual quality or change the mood of your scene with Tone Mapping effects with speed and ease of use. The Tone Mapping settings have the most useful options that are needed for your image to stand out or have the final polish without the need of Photoshop or compositor right in the viewport.

        Pavillon scene adjusted to a warmer tone and and vivid colors with K-Cycles tone mapping:



        Video of K-Cycles Tone Mapping:


        What is K-Cycles Bloom 

        • K-Cycles Bloom is the only Cycles implementation of Bloom in the viewpoint.

        • BETTER implementation of Bloom than the compositor, many more controls for manipulating your bloom PLUS more accurate bloom as well.

        • EASY to use and works just like you would expect.

        Bloom effects on Cycles viewport preview and final render!

        A feature that Eevee users have used and enjoyed is now available with K-Cycles. Dynamically interact with the scene in the viewport. Adjusting quickly the Bloom settings with fast performance in the preview render viewport. Creating beautiful Bloom effects in no time. The Bloom settings has all the options that are needed to design and easily create and customize your Bloom effect.

        Higher quality than Eevee. Eevee blurs and loses the light definition. See below:

        Eevee Bloom:

        K-Cycles Bloom:


        Chipp Walters (chippwalters) KIT OPS, SYNTH, BEVEL, BATCH, SMART SKETCH, CHALK STYLE PRO, QUICK SHOT, EEVEE Materials System and SIMPLE TABS creator

        "Bloom is always so hard to get just right in post. Now, you can achieve superior results in the viewport!" -- Chipp Walters 


        Bloom Render Images without compositor


        Vanke Future by 3D Shaker - Render with K-Cycles and Bloom

        Splash Fox by Daniel Bystedt - Render with K-Cycles and Bloom 


        What the Artists Say

        Jerry Perkins (masterxeon1001) hardOps and boxcutter creator

        “K-Cycles provides an alternative way to utilize the power of the RTX in ways vanilla Cycles cannot. From the moment you begin rendering with it you’ll notice an immense difference in speed and performance. I am proud of the work that has gone into optimizing such a classic renderer. Even in a post EEVEE work Cycles can prove itself competitive and giving a result that just can’t be matched. And with K-Cycles you’ll get there in a fraction of the time”

        Chipp Walters (chippwalters) KIT OPS, SYNTH, BEVEL, BATCH, SMART SKETCH, CHALK STYLE PRO, QUICK SHOT, EEVEE Materials System and SIMPLE TABS creator

        “I created the very first course on Interior Rendering with EEVEE, and what luck it was to have Eric as a beta tester. There is no one who knows more about Interior Rendering in Blender, both EEVEE and Cycles, than Eric. His technical expertise is unsurpassed. So, when he asked me to test K-Cycles, I jumped at the chance. Most will tell you I almost always render in EEVEE– but not anymore. I can’t believe the speed increases I now have rendering in K-Cycles. It’s a must have for any serious Blender artist!”

        Andrew Markert (GREEZYBEAR) KPACKS creator:

        “K-Cycles has been an awesome addition to my workflow by utilizing my GPU in order to render Cycles. I have a Nvidia RTX Titan graphics card and this is such a LEAP from CPU rendering to now GPU rendering! My render times have increased 3-4x faster than my current Blender 2.91. I feel this is a solid build and runs very smoothly. The image quality is also better to me and the viewport display has much more detail in it when in dev and render views. I am seriously impressed with the render times in K-Cycles and would definitely recommend this to anyone who loves to use the GPU for rendering!”

        Artists Render Images

        Here are examples of images rendered in K-Cycles.

        Evermotion vol.49 render with K-Cycles

        Evermotion vol.50 render with K-Cycles

        Evermotion vol.54 render with K-Cycles

        Andrew Markert


        Please visit us on Discord at: https://discord.gg/XTPB8tcase

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        Sales 3900+
        Customer Ratings 69
        Average Rating
        Dev Fund Contributor
        Published about 1 year ago
        Software Version 2.93, 3.0, 3.1
        License GPL
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