# Details

Description

What is Cycles?
Cycles is a ray tracing renderer focused on interactivity and ease of use, while still supporting many production features.

Contacts

Documentation
Manuals for both Artists and Developers are available.

Development
Cycles is officially under the Blender Foundation umbrella, and so is developed on developer.blender.org. Source code is available either as standalone repository or as bundled into Blender sources.

To clone Cycles together with blender please consult BF Blender project.

git clone git://git.blender.org/cycles.git

To clone as read-write (needs ssh key):

git clone git@git.blender.org:cycles.git

Browse code
Online browse of sources is available for:

# Today

Jeroen Bakker (jbakker) triaged T61736: Cycles OpenCL: Remove Mega kernel as Normal priority.
Michael Dingwall (macgeek21) added a watcher for Cycles: Michael Dingwall (macgeek21).

# Yesterday

Jeroen Bakker (jbakker) updated the diff for D4375: T61513: Refactored Cycles Attribute Retrieval.

That render time difference is really quite odd.

Jeroen Bakker (jbakker) added a project to D4376: T61463: Separate Baking kernels: Cycles.
Brecht Van Lommel (brecht) requested changes to D4375: T61513: Refactored Cycles Attribute Retrieval.

When committing this, please see the notes from:
https://developer.blender.org/rB9800837b987930e6152c2dc27cae5bd55873d306#218533

Artyom Abgaryan (AbgaryanFX) added a comment to T61628: Black Objects in LookDev mode.

This mostly happen with BSDF Surface / Shaders

I had the same problem last week. One of my files cashed at random while rendering in cycles. I tried rendering on CPU only but it crashed too. It was impossible to reproduce. Then with an older Beta version of Blender 2.8 it rendered.
I will have a look on it. I have to render a lot in the next weeks, maybe I can reproduce the problem or it is solved already.

I had the same problem last week. One of my files cashed at random while rendering in cycles. I tried rendering on CPU only but it crashed too. It was impossible to reproduce. Then with an older Beta version of Blender 2.8 it rendered.
I will have a look on it. I have to render a lot in the next weeks, maybe I can reproduce the problem or it is solved already.

Jeroen Bakker (jbakker) triaged T61700: Cycles OpenCL: When baking the kernels seems to be compiled twice as Normal priority.
Jeroen Bakker (jbakker) updated the task description for T61463: Cycles OpenCL: Split bake functions in their own program..

D4349 has been committed.

I'm rendering in Cycles and it does regularly crash in the first 50 frames. Although I did start at frame 16 and made it all the way through 160 once. Once. *sigh*

Windows 10 Home 64-bit
Intel i9-9990k
Nvidia RTX 2070
32 GB memory
Blender version 2.807d792976e100

# Mon, Feb 18

Windows 10 Home 64-bit
Intel i9-9990k
Nvidia RTX 2070
32 GB memory
Blender version 2.80.7d792976e100

Brand new Blender user here looking to dive in and found this thread for my crashes for animation.

Hmm, not sure why that is happening. Can you try the Blender 2.79 build from here: https://builder.blender.org/download/ ?

Hmm, not sure why that is happening. Can you try the Blender 2.79 build from here: https://builder.blender.org/download/ ?

Search for cmd in the windows search. Then execute this command C:\\path\\to\\blender.exe --debug (with the correct path of course).

Search for cmd in the windows search. Then execute this command C:\\path\\to\\blender.exe --debug (with the correct path of course).

Then try to start Blender from the console with the --debug option and post the output here.

If the bug still exists in the newer version, upload the .blend file if possible (so that we can reproduce the issue).