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Use rasterization when interactive speed is the priority and its lighting is good enough; add ray tracing when a particular effect such as reflections or shadows needs a more convincing result; choose path tracing when fuller light transport matters more than maximum performance. Many real-time renderers combine rasterization and ray tracing rather than choosing only one.
What makes the three methods different?
Rasterization: an efficient real-time baseline
Rasterization projects scene geometry onto the screen and determines the color of the resulting pixels through shading and other rendering steps. Its efficiency makes it a common choice for interactive graphics. It is not obsolete: it can provide the primary image in a modern hybrid renderer.
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Ray tracing: rays for selected lighting effects
Ray tracing follows rays through a scene to find intersections with objects. Those intersections can be used to render effects such as reflections, refractions, shadows, and indirect lighting. A renderer can apply ray tracing to specific effects without using it to produce every part of the image.
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Path tracing is a more comprehensive ray-based approach that models multiple interactions between light and surfaces. More sampling and light interactions can improve lighting fidelity, but also increase the computational work required to produce an image. The exact result and cost depend on the renderer, scene, and settings.
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Why real-time graphics often combine them
A hybrid renderer can use rasterization for primary visibility—the visible surfaces that make up the main view—and ray tracing for effects where it offers enough visual benefit. NVIDIA’s engine-integration guidance describes uses including reflections, diffuse global illumination, shadows, and ambient occlusion. This lets a renderer retain rasterization where it is effective rather than paying the cost of ray tracing everywhere.
There is no universal performance gain or image-quality ranking that applies across scenes and devices. Compare the actual modes in the application you use, since implementation and settings affect both appearance and speed. See NVIDIA’s overview of ray tracing, rasterization, and hybrid rendering and its guidance on integrating ray tracing into a real-time engine.
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Choose by workload and visual goal
| Approach | Best fit | Main trade-off |
|---|---|---|
| Rasterization | Interactive use where responsiveness is the priority and the available rasterized lighting is sufficient. | Does not provide the same ray-based treatment of effects such as reflections or indirect lighting. |
| Selective ray tracing or hybrid rendering | Real-time use when particular effects—such as reflections, shadows, or diffuse global illumination—meaningfully improve the image. | Those effects add rendering cost; the impact depends on the scene, implementation, settings, and hardware. |
| Path tracing | When fuller light transport and image fidelity matter more than maximum real-time performance, or when the renderer can spend more time per image. | More sampling and light interactions raise computational demand; real-time use can involve visible noise and reconstruction trade-offs. |
For games and other interactive applications
Start with rasterization if it meets your image-quality needs at the responsiveness you want. Try a hybrid or selective ray-tracing mode if a specific effect is worth its cost. Judge the result in the actual scene: the relevant question is whether the visual improvement is worth any reduction in frame rate on your system.
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For images where lighting fidelity matters most
Path tracing is a reasonable choice when a more complete treatment of light is worth longer rendering or lower real-time performance. It is not automatically noise-free: real-time renderers may use denoising and reuse information from previous lighting calculations to manage noise at low ray counts. NVIDIA discusses these sampling and denoising trade-offs in its article on interactive path tracing.
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How to compare the modes in your application
- Set your target. Decide whether you care most about a particular lighting effect, a responsive frame rate, or image fidelity with more time available per image.
- Compare the same scene. Use the same view and, where possible, the same output resolution and other settings. Otherwise, a visual difference may not come from the rendering method alone.
- Check the actual performance. For interactive use, observe frame rate and responsiveness; for offline rendering, consider how long each image takes. The sources do not establish a universal performance threshold.
- Inspect image artifacts. Look for noise, denoising softness, or other reconstruction artifacts, particularly in real-time path-traced modes.
- Verify support on your device. Hardware and software support vary by application and workload. GPU acceleration can enable real-time ray-tracing workloads, but the available sources do not establish a universal hardware requirement or compare current graphics cards.
When hardware support matters
Ray-tracing performance depends partly on hardware and software support. NVIDIA describes GPU hardware acceleration as part of enabling real-time ray-tracing workloads, but that does not establish that every ray-tracing or path-tracing application requires NVIDIA hardware. Check the application’s own compatibility and performance guidance for your system. NVIDIA’s real-time ray-tracing overview describes its RTX technologies; it is not a cross-vendor comparison or a recommendation of a particular graphics card.
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