Chisel

Chisel turns Blender into a real-time SDF modeling studio. Carve with math, not meshes — every surface is mathematically smooth, every boolean blends like molten metal, and the ray-marched viewport shows the final result as you sculpt.

First-run shader compilation

The first time you enable the Chisel render engine in a session, the GPU compiles the ray-marching pipelines on the fly. Expect a noticeable pause on the first viewport frame — typically a couple of seconds on Vulkan, longer on OpenGL. Compilation runs in parallel and is non-blocking, but the viewport will look empty until the first variant is ready.

A few things to know:

It’s a one-time cost per session. Subsequent renders use the cached pipeline. The compiled binaries are also persisted to disk, so warm starts after the first run are much faster.
Vulkan is dramatically faster than OpenGL. If your status bar shows the OpenGL backend, switch to Vulkan in Blender’s preferences (Edit → Preferences → System → Backend) for a 5–10× compile and runtime speedup.
The pie menu warns you. When you press Q before shaders are ready, the menu shows “Shaders not compiled — first run may take longer” with a manual recompile button.
You can pre-warm. From the addon preferences (Edit → Preferences → Add-ons → Chisel), the Recompile Shaders button kicks off compilation without needing to add geometry first.

If you ever see flat shading, blank silhouettes, or stalls on the first interaction with a new feature (booleans, mirrors, curve primitives), it’s almost always shader compilation finishing in the background. Wait a few seconds and the viewport will catch up.

Why SDFs?

Traditional mesh modeling trades resolution for smoothness. SDFs don’t trade — they compute. A sphere stays spherical at any scale, a blend stays blended through every boolean in the stack, and a rounded corner is a math constant, not a subdivision setting. Production-ready surfaces, no topology headaches.