Cycles Source Layout

Modules

High level overview of Cycles modules

The source code is organized into folders as follows:

app/	Standalone session and network rendering server applications.
blender/	Python module and C++ extension to integrate with Blender.
blender/addon	Python scripts for the Blender addon.
bvh/	Bounding volume hierarchy constructions for raytracing.
cmake/	Build and release files.
device/	Device abstraction.
device/cpu/	CPU device.
device/cuda/	CUDA device.
device/dummy/	Dummy device.
device/hip/	HIP device.
device/hiprt/	HIP RT device.
device/metal/	Metal device.
device/multi/
device/oneapi/	oneAPI device.
device/optix/	Optix device, based on CUDA.
doc/license/	Licenses.
integrator/	Host side code for path tracing integrator, invoking rendering kernels.
graph/	Generic scene node graph.
kernel/	Rendering kernel, that can run on the CPU or GPU.
kernel/closures/	BSDF closures used by svm and osl shader backend.
kernel/device/	Kernel code specific to CPU and GPU devices.
kernel/integrator/	Path tracing integrator kernels.
kernel/svm/	Shader virtual machine to execute shader graphs on the CPU and GPU.
kernel/osl/	OSL render services and shading engine, only runs on the CPU.
kernel/osl/shaders/	OSL shaders used in the shader graph.
scene/	Render scene and its nodes.
session/	Render session and associated data structures like drivers and render buffers
subd/	Tesselation and subdivision surfaces.
test/	Unit tests.
util/	Utility code.