Blender EEVEE Ray Tracing Settings: An Interior Rendering Guide

This guide is based on the EEVEE render settings in the Blender 5.2 LTS manual and the Blender Manual’s ray tracing documentation. Ray tracing in EEVEE aims to improve the accuracy of indirect lighting from surfaces. It offers settings that affect results such as reflections, light leaks and noise in interior visualizations. Since the manual does not prescribe a fixed quality recipe, settings should be evaluated according to the needs of each scene.

1. Choose a ray tracing method

The settings are in Render › Raytracing. When ray tracing is disabled, EEVEE switches to a faster rendering pipeline that uses pre-filtered light probes. The Blender manual describes this as a more stable and optimized alternative when visual accuracy is not a priority.

There are two methods for enabling ray tracing. Light Probe finds scene intersections using light probe spheres and planes. According to the manual, this method has the lowest tracing cost, but relies on manually placed light probes. Screen-Trace traces rays against the screen’s depth buffer. When a ray leaves the field of view, it falls back to light probes.

1. Open Render › Raytracing.

2. Choose Light Probe to work with probes, or Screen-Trace to trace using screen depth data.

3. Check the result with the same scene and camera view. When using Screen-Trace, account for rays that leave the field of view falling back to probes.

2. Understand resolution and Screen-Trace options

Ray tracing resolution determines the resolution at which the process runs. The manual states that lower options render faster and use less memory, but can produce blurrier results. So, lower settings may be worth considering when speed and memory use are priorities during work; if blurring is visible in the final image, reassess the resolution choice. The documentation does not recommend a specific resolution value.

Additional controls are available when Screen-Trace is enabled. Increasing Precision can improve intersection accuracy and reduce artifacts. The trade-off is higher performance cost and a shorter maximum tracing distance. Thickness determines how thick surfaces represented in the depth buffer are assumed to be during ray tracing. Higher values may reduce missed intersections, but can extend reflections and cause flickering. Lower values can make intersections more accurate, but increase the likelihood of thin surfaces being skipped.

When Backface is enabled, rays that hit the back faces of visible geometry are treated as valid intersections. According to the Blender manual, this can reduce light leaks when using screen-space global illumination. Radiance Scale controls how much front-face lighting is used to approximate indirect lighting at back-face intersections.

3. Evaluate Fast GI and denoising

Fast GI Approximation is an alternative to the ray tracing pipeline for rough BSDFs. It can produce less noisy images than tracing individual rays and capture bounced lighting more efficiently. Since this feature works as a screen-space effect, it also has the limitations of screen space.

You can choose Ambient Occlusion or Global Illumination as the method. Ambient Occlusion shades distant lighting from light probes using scene intersections and, according to the documentation, is the fastest option. Global Illumination accounts for light reflected from surrounding objects. With Fast GI resolution, lower options improve speed and memory use but can increase blurring.

Increasing Precision can make GI rays intersect the scene more accurately, but comes at a performance cost. Thickness Near accounts for the geometric thickness of surfaces and helps reduce light leaks and missing contact shadows; its effect decreases with distance from the shading point. Far can reduce energy loss and missing shading from distant geometry. Values that are too high for very thin objects can cause excessive light blocking or reflections. Bias offsets the shading normal to reduce self-intersection artifacts.

4. Checks for interior and archviz workflows

First, review the effects of method and resolution choices separately; changing multiple settings at once can make it harder to identify which one affected the result. Check different camera views with Screen-Trace. In particular, remember that for reflections and lighting tied to surfaces outside the field of view, the method falls back to light probes. On thin surfaces, compare how Thickness affects missed intersections, extended reflections and flickering.

When using Fast GI, evaluate resolution, Rays and Steps for noise and blurring. Higher Steps can reduce noise and improve quality; the manual does not specify a performance cost for this setting. A performance cost is explicitly noted for higher Precision.

Denoising can reduce noise in raw ray tracing output and help stabilize the image, but may cause excessive blurring. Spatial Reuse reuses rays from neighboring pixels, but can create light leaks between surfaces. Temporal Accumulation reprojects and accumulates previous ray tracing results. This method can reduce Fireflies; it can also introduce color bias and may be used to improve viewport stability or make the render converge faster. Bilateral Filter blurs the resolved ray tracing output by filtering it.

For architecture firms, interior designers and visualization artists, these controls help tune lighting and reflections to the goals of the project. However, the documentation does not provide specific hardware requirements, licensing terms or render-time guarantees. Rather than estimating performance on a workstation, check the visual impact of the options and how well they fit the workflow using the same scene.

Common mistakes

• Ignoring the possibility of blurring when choosing a lower resolution.

• Forgetting that Screen-Trace rays fall back to light probes when they leave the frame.

• Failing to account for how increasing Thickness can extend reflections and cause flickering.

• Not checking for blurring or light leaks after denoising and Spatial Reuse.

• Overlooking the performance cost of increasing Precision.