Lighting & rendering · Intermediate

Render samples

How many light paths a renderer averages per pixel: more means less noise

Also called samples per pixel, sample count

What are render samples?

Render samples are the number of light paths a ray tracer or path tracer averages for each pixel. More samples mean a cleaner, less grainy image but a longer render. The sample count is usually the main quality setting in a realistic render engine.

Think of it like this

It is like asking strangers for directions: one answer might be wrong, but the average of fifty is reliable.

Where it fits in a 3D project

  1. Create
  2. Surface
  3. Rig
  4. Animate
  5. Render
  6. Export

Render: Lighting the scene and turning it into images or video.

How render samples work

  1. 01For each pixel, the renderer traces one random light path, called a sample.
  2. 02It repeats this many times, each path taking a slightly different route.
  3. 03The results are averaged into the pixel’s final color.
  4. 04Noise drops as samples rise, but each doubling helps less than the last.

Render samples vs denoising

PropertyRender samplesDenoising
How it cleansComputes more real lightGuesses and smooths leftover noise
CostMore render timeSeconds after rendering
RiskOnly longer rendersSmeared or waxy detail
Best useFinal detail and fine texturesPreviews and moderate sample counts

Use enough samples to give the denoiser a reasonable image, then let it finish the job; relying on denoising alone can blur fine detail.

Where render samples are used

  • Balancing render quality against time
  • Fast low-sample previews while lighting
  • Clean final frames for animation and stills

Beginner tip

Use a noise threshold instead of a fixed count when your engine offers one. It stops sampling each pixel once it is clean enough, saving time on easy areas.

Terms related to render samples

Render samples FAQ

How many samples should I render with?
There is no single number. Start low for previews, then raise samples for final frames until the leftover noise is small enough for your denoiser. Interiors, glass and fog need more than a simple outdoor product shot.
What is adaptive sampling?
A setting that stops sampling each pixel once it is clean enough, judged by a noise threshold. Easy areas, like a flat sky, finish early while hard areas keep going.
Why do more samples barely change my render?
Noise falls more slowly as samples rise, so going from 1,000 to 2,000 helps far less than going from 50 to 100. If noise persists, look for its cause, such as tiny lights or caustics.

Updated October 29, 2026 · Browse all 3D terms