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title: How do you use the Ray Tracing Effect?
description: How you use the Ray Tracing Effect
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1. [Knowledge Base](https://support.lumion.com/knowledge-base?hsLang=en-us)
2. [Movie & Photo Mode Questions](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us)

# How do you use the Ray Tracing Effect?

![](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13138181946780_1753905336465-Aug-19-2025-12-28-46-5399-AM.png)

*Ray Tracing* (implemented using the ***Path Tracing*** method) is a rendering system that accurately simulates the behavior of real-world lighting by calculating and tracing the paths of light rays as they interact with objects in a scene. This results in lifelike shadows and reflections, drastically enhancing photorealism and fidelity of visualizations. 

**1. Here's how to use it:**

In Lumion, the *Ray Tracing*  engine is enabled via an *Effect* in *Photo* or *Movie Mode*.

The *Effect*  can only be enabled if your PC has a Ray Tracing-capable graphics card. Please consult section **1.6** for compatibility:

- **Knowledge Base:**  [Which graphics card do you need for Lumion 2024 and 2025?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/12614095715868.json?hsLang=en-us)

Also, Windows must meet at least minimum requirements, preferably fully updated.  See:

- **Knowledge Base:**  [What kind of computer does Lumion 2024 or 2025 need?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/12614080933660.json?hsLang=en-us)

If your graphics card supports this technology, simply add the *Effect* to a *Photo* or *Clip* to enable the *Ray Tracing* engine. You can find it in the *Featured* or *Lighting* categories:

![](https://support.lumion.com/hs-fs/hubfs/Knowledge%20Base%20Import/13112871159580_1753905340775-Aug-19-2025-12-28-35-6004-AM.png?width=665&height=246&name=13112871159580_1753905340775-Aug-19-2025-12-28-35-6004-AM.png)

You'll instantly notice a great improvement in shading, reflections, and overall ambient lighting:

![fallraster.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13104376048156_1753905342189-Aug-19-2025-12-28-41-0365-AM.jpg)Ray Tracing OffRay Tracing On

![fallrt.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13104376054940_1753905343605-Aug-19-2025-12-28-37-7629-AM.jpg)

 

 

 

Other benefits of using *Ray Tracing* :

- *Area Lights* and *Emissive Materials* now cast shadows.
- All light sources interact better with *Subsurface Scattering*.
- You get perfect *Reflections* without the need to manually add *Reflection Planes*.
- *Glass* casts shadows and can now be used with *Depth of Field*.
- No screen-space effect, which means *Emissive* surfaces that are not facing the camera still cast light.
- More natural colors.

![dinner\_Raster.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13120433797404_1753905344812-Aug-19-2025-12-28-36-6117-AM.jpg)Ray Tracing OffRay Tracing On

![dinner\_RT.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13139608527772_1753905345892-Aug-19-2025-12-28-39-8699-AM.jpg)

 

 

 

Since *Ray Tracing* takes care of emulating how the light behaves with greater precision and realism, the following *Effects* will get disabled when the *Ray Tracing Effect* is applied to the *Photo* or *Clip*. 

- *Global illumination Effect*. (Lumion 2023 only, this *Effect* has been deprecated (no longer available) for Lumion 2024)
- *Hyperlight Effect*.
- *Reflection Effect*.
- *Skylight Effect*.
- *Shadows Effect*.

![Effect\_-\_Ray\_Tracing\_\_with\_5\_Other\_Effects\_auto-disabled.png](https://support.lumion.com/hs-fs/hubfs/Knowledge%20Base%20Import/8066896535068_1753905346802-Aug-19-2025-12-28-43-1500-AM.png?width=271&height=228&name=8066896535068_1753905346802-Aug-19-2025-12-28-43-1500-AM.png)

 

 

**2. The Effect's settings:**

In Lumion 2024, there are now 6 adjustable options in the *Ray Tracing Effect* :  
 

![](https://support.lumion.com/hs-fs/hubfs/Knowledge%20Base%20Import/13139613403292_1753905347488-Aug-19-2025-12-28-44-2452-AM.png?width=658&height=285&name=13139613403292_1753905347488-Aug-19-2025-12-28-44-2452-AM.png)

 

### 2.1: Quality Presets

The *Ray Tracing*  comes with 4 different preconfigured *Quality*  settings*.* The *Samples* , *Bounces* , and *Fully Ray-traced Glass*  toggle will change depending on what preset you choose:

**Photo Mode:**

 

**Quality**

**Setting**

*Fast*

*Balanced*

*High*

*Extreme*

*Samples*

16

64

256

512

*Bounces*

3

5

7

8

RT Glass

Off

Off

On

On

**Movie Mode:**

 

**Quality**

**Setting**

*Fast*

*Balanced*

*High*

*Extreme*

*Samples*

1

4

16

64

*Bounces*

5

6

7

8

RT Glass

Off

Off

On

On

The preconfigured settings are different in *Movie Mode* because videos use a different *Denoiser* that renders faster while requiring fewer *Samples* .

Changing any setting will set the *Quality*  preset to *Custom* .

 

### 2.2: Samples

This slider adjusts the number of rays shot per pixel per frame to control the accuracy of light: the bigger the *Samples*  value, the higher the number of rays shot and intersections calculated, which results in greater rendering accuracy and level of detail:

![INT16samples.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13139809473564_1753905348473-Aug-19-2025-12-28-50-4734-AM.jpg)16 Samples256 Samples

![INT256samples.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13139809474332_1753905349931-Aug-19-2025-12-28-53-7019-AM.jpg)

 

 

 

Note that a higher *Samples*  value will boost quality but will also result in longer rendering times, so increase it only when necessary, for example, on low-lit indoor scenes (which usually produce more noise).

However, for well-lit interior environments and exterior scenes, (or quick draft renders), a low number of *Samples*  (around 16) usually does the job. Example below:

![museum16samples.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13136889874332_1753905351160-Aug-19-2025-12-28-38-8033-AM.jpg)16 Samples256 Samples

![museum256samples.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13136906225564_1753905352533-Aug-19-2025-12-28-45-3134-AM.jpg)

 

 

 

So, if you don't see much of a difference when increasing *Samples* , you might as well reduce the setting to save valuable rendering time. 

This is especially the case in *Movie Mode* , as it uses a different *Denoiser* that can produce usable videos even at 1 *Sample* .

### 2.3: Bounces

The number of *Bounces*  simulates the interaction of light with reflective surfaces of objects. When a light ray hits an object, it is randomly deflected in a certain direction and the result is a converged image with smooth 'blending' between different surfaces in the rendering whose colors affect each other. 

The higher the value, the better the global Illumination:

![2bounces.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13137452452124_1753905353899-Aug-19-2025-12-28-51-5849-AM.jpg)2 Bounces6 Bounces

![6bounces.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13137469004828_1753905355294-Aug-19-2025-12-29-02-0849-AM.jpg)

 

 

 

You will usually need more *Bounces*  in indoor scenes, where you want to have as much realistic light bounce as possible.

 

### 2.4: Denoiser

Noise commonly occurs in *Ray-traced*   renders due to the complex calculations involved in simulating light behavior. The *Denoiser* is a crucial tool used to reduce the amount of graininess in *Photos*  and *Movies* , and it works by analyzing the noisy image and intelligently smoothing out these imperfections while preserving important details, resulting in a cleaner and more visually pleasing final render. 

![](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/8048292496540_1753905357131-Aug-19-2025-12-28-58-0110-AM.png)

By effectively removing noise, *Denoisers* help enhance the overall quality of rendered images, making them appear more polished and professional. An unneeded high number of *Samples*  may not require denoising if the lighting conditions are right, however, it will result in longer rendering times.

#### 2.4.1: Movie Mode Denoiser Options In *Movie Mode* , you'll notice there's an additional option to select between two *Denoisers* :

- **OIDN:** This is the *Denoiser* used in *Photo Mode* . It employs sophisticated denoising algorithms that achieve high-quality results but may require more computational resources and time to process. When time is not a concern, consider trying OIDN as it might produce better-quality reflections.
- **NRD:** This *Denoiser* is optimized for efficiency and speed, leveraging techniques such as hardware acceleration and neural network inference to deliver fast denoising performance while keeping a good framerate, so it might not be as sharp as OIDN but is well suited for real-time rendering and rendering videos quickly.

#### 2.4.2:  How the Denoiser options work

**1.** When the *Denoiser* is ON in *Photo Mode*: Preview is denoised with NRD // final output is denoised with OIDN.  
**2.** When the *Denoiser* is OFF in *Photo Mode*: Preview is denoised with NRD // final output is not denoised.  
**3.** When the *Denoiser* is ON in *Movie Mode* (i.e. something is selected in the Denoiser dropdown): Preview is denoised with NRD // final output is denoised with the Denoiser that is selected.  
**4.**  When the *Denoiser* is OFF in *Movie Mode* (i.e. nothing is selected in the Denoiser dropdown): Preview is denoised with NRD // final output is not denoised.

#### 2.4.3: Summary of Denoiser Options:

- Preview:  NRD is used all the time.
- HQ Preview: OIDN is used all the time.
- Final Render - Denoiser On: 
    - Photo Mode default Denoiser: OIDN.
    - Movie Mode: option you select (NRD or OIDN), *except for still image renders (see this table)*.

 

**Preview:**

**HQ Preview:**

**Final Render:**

*Photo Mode:*

Denoiser: ON

NRD

OIDN

OIDN

Denoiser: OFF

NRD

OIDN

Not Denoised

*Movie Mode (Clip or Entire Movie):*

Denoiser: ON

Option:  NRD

NRD

OIDN

*Video (Current Clip: MP4)*: NRD

*Image Sequence* (all: *All Frames, Keyframes, Frame Range*): OIDN

*Current Image*: OIDN

 

Denoiser: ON

Option:  OIDN

NRD

OIDN

*Video (Current Clip: MP4)*: OIDN

*Image Sequence* (all: *All Frames, Keyframes, Frame Range*): OIDN

*Current Image*: OIDN

Denoiser: OFF

NRD

OIDN

Not Denoised

 

 

### 2.5: Firefly Filter

In *Ray-traced*   renders, fireflies are small, bright, unwanted artifacts that appear as isolated, high-intensity pixels scattered throughout the image. These fireflies often result from the complex interactions of light rays with surfaces and materials in the scene and typically appear in low-light scenes, on reflective surfaces, or when there are extremely bright lights. 

To tackle this, Lumion has a *Firefly Filter*  feature:

- ![](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13120142963740_1753905359443-Aug-19-2025-12-28-42-0895-AM.png)

The *Firefly Filter*  will take a pixel and look at all its neighboring pixels. If the difference between the neighbors and the current pixel is too large, then it will be replaced with the avarage color of its neighbours, resulting in a cleaner image, even in the *Ray-traced Preview* :

![FFOFF.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13161156637724_1753905360550-Aug-19-2025-12-28-52-7114-AM.jpg)Firefly Filter OffFirefly Filter On

![FFON.jpg](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13161156639388_1753905361760-Aug-19-2025-12-28-56-8721-AM.jpg)

 

 

 

Notice how the fireflies in the ground *Material,* poles, and trees are reduced when turning on the filter. 

 

### 2.6: Fully Ray-traced Glass and Water

#### **Glass**

Lumion 2024 introduces *Fully Ray-traced Glass*. Enabling this setting will cause *Glass* to have additional properties for the index of refraction and reflection, which results in a more authentic look and eliminates certain limitations that regular *Glass*  has.

![](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/13161156651804_1753905363012-Aug-19-2025-12-29-00-0668-AM.png)

To learn all about *Ray-traced Glass*   follow this article:

- **Knowledge Base:** [The New Glass Material for Lumion 2024 and the Glass setting for Ray Tracing](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/12802058309532.json?hsLang=en-us)

 

#### **Water**

The *Water Material* has now been converted fully for the *Ray Tracing* pipeline to provide a boost of realism.

**![](https://support.lumion.com/hubfs/Knowledge%20Base%20Import/19827977687068_1753905365633-Aug-19-2025-12-28-54-8713-AM.png)**More information on how this toggle affects *Water* can be found below:

- **Knowledge Base:** [Water Materials in Lumion 2025 and newer](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/19358104296988.json?hsLang=en-us)

 

**5. Technical Limitations:**

The *Ray tracing Effect*  will display an incredible increase in the quality of the rendered output. However, there are certain limitations in its usage described in the article below: 

- **Knowledge Base:** [Transitions: From prior versions to working with the new Lumion 2025](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/19338843803292.json?hsLang=en-us)

 

**See Also:** 

- **Knowledge Base:**  [What does the message 'Low VRAM detected' mean?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/8111188742684.json?hsLang=en-us)
- **Knowledge Base:** [Why is the Raytracing Effect blocked on my PC?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/7442302194972.json?hsLang=en-us)
- **Video Tutorial:**  [Lumion 2023: The Raytracing Effect](https://support.lumion.com/video-tutorials/api/v2/help_center/en-us/articles/8043238179228.json?hsLang=en-us)

 

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    - [Questions mainly for older versions than Lumion 12](https://support.lumion.com/knowledge-base/build-mode-questions?hsLang=en-us#questions-mainly-for-older-versions-than-lumion-12)
- [Library Content](https://support.lumion.com/knowledge-base/library-content?hsLang=en-us#main-content)

    - [Library Content in Lumion 2026](https://support.lumion.com/knowledge-base/library-content?hsLang=en-us#library-content-in-lumion-2026)
    - [Library Content in Lumion 2025](https://support.lumion.com/knowledge-base/library-content?hsLang=en-us#library-content-in-lumion-2025)
    - [Library Content in Lumion 2024](https://support.lumion.com/knowledge-base/library-content?hsLang=en-us#library-content-in-lumion-2024)
    - [Library Content in Lumion 2023](https://support.lumion.com/knowledge-base/library-content?hsLang=en-us#library-content-in-lumion-2023)
    - [Library Content in Lumion 12](https://support.lumion.com/knowledge-base/library-content?hsLang=en-us#library-content-in-lumion-12)
- [Movie & Photo Mode Questions](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us#main-content)

    - [Photo Mode](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us#photo-mode)
    - [Movie Mode](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us#movie-mode)
    - [Animation in Movie Mode](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us#animation-in-movie-mode)
    - [Effects in Photo or Movie Mode](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us#effects-in-photo-or-movie-mode)
    - [Reflections](https://support.lumion.com/knowledge-base/movie-photo-mode-questions?hsLang=en-us#reflections)
- [Material Questions](https://support.lumion.com/knowledge-base/material-questions?hsLang=en-us#main-content)

    - [Materials in versions 12 and earlier](https://support.lumion.com/knowledge-base/material-questions?hsLang=en-us#materials-in-versions-12-and-earlier)
    - [Using LiveSync for Revit and a Section Box](https://support.lumion.com/knowledge-base/material-questions?hsLang=en-us#using-livesync-for-revit-and-a-section-box)
- [Rendering Questions](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#main-content)

    - [General Rendering Questions](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#general-rendering-questions)
    - [Rendering of Photos](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#rendering-of-photos)
    - [Rendering of Clips and Movies](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#rendering-of-clips-and-movies)
    - [Tips to getting the best renders](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#tips-to-getting-the-best-renders)
    - [Rendering Performance](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#rendering-performance)
    - [Technical Issues when Rendering](https://support.lumion.com/knowledge-base/rendering-questions?hsLang=en-us#technical-issues-when-rendering)
- [Panorama Mode Questions](https://support.lumion.com/knowledge-base/panorama-mode-questions?hsLang=en-us#main-content)

    - [Technical questions when rendering with Panorama Mode](https://support.lumion.com/knowledge-base/panorama-mode-questions?hsLang=en-us#technical-questions-when-rendering-with-panorama-mode)
- [File & BackUp Questions](https://support.lumion.com/knowledge-base/file-backup-questions?hsLang=en-us#main-content)

    - [Saving and Backup](https://support.lumion.com/knowledge-base/file-backup-questions?hsLang=en-us#saving-and-backup)
    - [File Saving Issues](https://support.lumion.com/knowledge-base/file-backup-questions?hsLang=en-us#file-saving-issues)
    - [Lumion-Documents](https://support.lumion.com/knowledge-base/file-backup-questions?hsLang=en-us#lumion-documents)
    - [Transfer, Move or Migrate Files](https://support.lumion.com/knowledge-base/file-backup-questions?hsLang=en-us#transfer-move-or-migrate-files)
- [Troubleshooting](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#main-content)

    - [Reports about your PC](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#reports-about-your-pc)
    - [Photo and Movie Mode Issues](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#photo-and-movie-mode-issues)
    - [Rendering Issues](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#rendering-issues)
    - [Error Messages from Lumion](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#error-messages-from-lumion)
    - [Hardware related Issues](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#hardware-related-issues)
    - [Other Troubleshooting Issues](https://support.lumion.com/knowledge-base/troubleshooting?hsLang=en-us#other-troubleshooting-issues)
- [Article Developments](https://support.lumion.com/knowledge-base/article-developments?hsLang=en-us#main-content)

    - [Devs - Multi‑Image Button Viewer](https://support.lumion.com/knowledge-base/article-developments?hsLang=en-us#devs-multi-image-button-viewer)

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#### Product

[Plans and pricing](https://lumion.com/product/buy)

[Discover Lumion](https://lumion.com/product/discover-lumion)

[Compatibility](https://lumion.com/compatibility/)

[System Requirements](https://lumion.com/product/system-requirements)

[Find a reseller](https://lumion.com/about/find-reseller)

[Free trial](https://lumion.com/product/free-trial)

#### Solutions

[Architectural design](https://lumion.com/product/architectural-design)

[Interior design](https://lumion.com/product/interior-design)

[Landscape architecture](https://lumion.com/product/landscape-architecture)

[Urban planning](https://lumion.com/product/urban-planning)

[3D rendering](https://lumion.com/product/3d-rendering-software)

[Education](https://lumion.com/product/educational-licenses)

#### Compatibility

[Trimble SketchUp](https://lumion.com/compatibility/sketchup-rendering)

[Autodesk Revit](https://lumion.com/compatibility/revit-rendering)

[Graphisoft ArchiCAD](https://lumion.com/compatibility/archicad-rendering)

[Rhinoceros](https://lumion.com/compatibility/rhino-rendering)

[Autodesk Autocad](https://lumion.com/compatibility/autocad-rendering)

[Autodesk FormIt Pro](https://lumion.com/compatibility/lumion-for-autodesk-formit-pro)

[Nemetschek Allplan](https://lumion.com/compatibility/allplan-rendering)

[Nemetschek Vectorworks](https://lumion.com/compatibility/vectorworks-rendering)

[BricsCAD](https://lumion.com/compatibility/bricscad-rendering)

[3D Studio Max](https://lumion.com/compatibility/3ds-max-rendering)

#### Resources

[Made with Lumion](https://lumion.com/made-with-lumion)

[Tutorials](https://support.lumion.com/video-tutorials?hsLang=en-us)

[Support and learning](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/360044608053.json?hsLang=en-us)

[Downloads](https://support.lumion.com/downloads?hsLang=en-us)

[Community](https://community.lumion.com/index.php)

#### About

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