3D rendering and lighting terms
How a 3D scene becomes an image: the lights, the camera and the render engine that works out what every pixel should show.
Beginner 3D rendering and lighting terms
- Active cameraThe one camera a scene renders through, out of all the cameras in it
- Anti-aliasingSmoothing the jagged stair-step edges in rendered images
- Cel shadingA style that makes 3D look hand-drawn, with flat color bands and outlines
- Depth of fieldHow much of the scene, front to back, looks sharp
- Field of viewHow wide a camera sees, set by its lens
- Focal lengthThe lens setting that controls zoom and perspective
- HDRIA 360-degree image that stores real light levels, used to light 3D scenes
- Image sequenceAn animation saved as numbered still images, one per frame, instead of one video file
- Light typesPoint, sun, spot and area: the four lamps in Blender and how each casts shadows
- Motion blurThe streak a fast-moving object leaves in a frame
- Orthographic projectionA view with no perspective, where objects stay the same size at any distance
- Real-time renderingDrawing 3D images fast enough to react instantly, as in games and viewports
- Render engineThe software that turns a 3D scene into finished images
- RenderingTurning a 3D scene into finished images or video frames
- Specular reflectionMirror-like reflection that creates shiny highlights on a surface
- Turntable renderA looping animation that spins a 3D model so you see every side
- World environmentThe sky and background around a 3D scene, which also lights everything in it
Intermediate 3D rendering and lighting terms
- DenoisingCleaning the grainy speckle out of a fast render
- FirefliesBright speckled pixels that scatter across a path-traced render
- Fresnel effectWhy surfaces turn more mirror-like when you view them at a glancing angle
- Global illuminationLight that bounces between surfaces, filling shadows and carrying color
- HDR (high dynamic range)Images that hold a much wider range of dark to bright
- Image-based lightingLighting a 3D scene with a panoramic image of its surroundings
- Index of refractionThe number that sets how much glass, water and gems bend light
- LightmapA texture of baked lighting that lets real-time scenes look richly lit
- Path tracingRay tracing that follows light through many bounces for photoreal images
- Phong shadingA classic per-pixel lighting method for smooth surfaces and soft highlights
- RasterizationThe fast way games and viewports draw 3D, by filling in triangles on screen
- Ray tracingRendering by following rays of light for true reflections and shadows
- Render farmMany computers rendering an animation together to finish it faster
- Render passesSeparate images of a render’s lighting, shadows, depth and masks
- Render samplesHow many light paths a renderer averages per pixel: more means less noise
- Screen-space reflectionA real-time trick that builds reflections from what is already on screen
- Shadow mappingHow real-time engines draw shadows fast, using a depth image from each light
- Subsurface scatteringLight soaking into skin, wax or marble and glowing out nearby
- Tone mappingFitting a render’s huge brightness range onto a screen without losing detail
- View transformThe curve that turns raw render light into colors a screen can show, like AgX or Filmic
- Volumetric lightingLight made visible in fog, dust or smoke, creating beams and haze
Advanced 3D rendering and lighting terms
More 3D glossary topics
3D rendering and lighting terms FAQ
What is the difference between offline and real-time rendering?
Offline rendering takes as long as it needs per frame, from seconds to hours, for the best quality. Real-time rendering draws many frames every second, as games do, trading some accuracy for speed.
Why do my renders look noisy?
Noise means too few samples: the renderer has not traced enough light paths per pixel. Raise the sample count, turn on a denoiser, or add light so each sample carries more information.
What lighting should a beginner start with?
An HDRI for overall light and reflections, then one key light to shape the subject. That simple setup looks natural and is easy to adjust before you add more lights.