Lighting & rendering · Intermediate
Path tracing
Ray tracing that follows light through many bounces for photoreal images
What is path tracing?
Path tracing is a rendering method that follows many random paths of light from the camera as they bounce from surface to surface. Averaging those paths captures direct light, bounced light, soft shadows and color bleeding in one process, which is why the results look so close to a photograph.
Think of it like this
It is like rolling thousands of marbles from your eye into a room and tracking how each one bounces until it reaches a lamp or a window.
Where it fits in a 3D project
- Create
- Surface
- Rig
- Animate
- Render
- Export
Render: Lighting the scene and turning it into images or video.
How path tracing works
- 01For each pixel, the renderer sends a ray from the camera into the scene.
- 02At each hit, the ray bounces off in a random direction the material allows.
- 03The path ends when it reaches a light or runs out of bounces.
- 04Many paths per pixel are averaged, so noise fades as samples rise.
Path tracing vs ray tracing
| Property | Path tracing | Ray tracing |
|---|---|---|
| Scope | Full light simulation with many bounces | A family of methods that trace rays |
| Bounced light | Included by default | Optional, often skipped |
| Noise | Grainy until enough samples | Cleaner when only tracing direct effects |
| Speed | Slowest, most realistic | Faster, depending on the effects |
Path tracing is a kind of ray tracing: choose it when you want the whole picture of light, and simpler ray tracing when you only need sharp reflections or shadows.
Where path tracing is used
- Final frames for film and animation
- Photoreal product and interior renders
- Reference images for checking real-time lighting
Beginner tip
Set up lights with a low sample count and a denoiser, then raise samples only for the final render. Most lighting decisions do not need a perfectly clean image.
Terms related to path tracing
- Lighting & renderingRay tracingRendering by following rays of light for true reflections and shadows
- Lighting & renderingGlobal illuminationLight that bounces between surfaces, filling shadows and carrying color
- Lighting & renderingRender samplesHow many light paths a renderer averages per pixel: more means less noise
- Lighting & renderingFirefliesBright speckled pixels that scatter across a path-traced render
- Lighting & renderingDenoisingCleaning the grainy speckle out of a fast render
- Lighting & renderingRender engineThe software that turns a 3D scene into finished images
Path tracing FAQ
Updated October 29, 2026 · Browse all 3D terms