The Path tracer feature in Twinmotion is a progressive rendering mode that generates high-quality photorealistic renderings with accurate lighting and Global Illumination (GI).
This page describes the hardware and software requirements to use the Path tracer, and provides a brief overview of the Multi-GPU feature you can use to enhance the performance of the Path tracer.
Operating System
The Path tracer is currently supported on Windows computers only.
Twinmotion is based on Unreal Engine which does not yet support path tracing on MacOS. Once path tracing becomes available on MacOS in Unreal Engine, we will be able to include this functionality in Twinmotion.
Graphics Card Requirements
To use path tracing, your computer must be equipped with one of the following:
Any NVIDIA RTX graphics card.
NVIDIA T1000 cards are not supported.
An AMD RX 6000 series or higher graphics card.
In addition, your graphics card must meet the following requirements:
Have at least 8GB of dedicated Video-Access Random Memory (VRAM).
Support DirectX12 (DXR).
Have all the latest drivers installed.
DirectX12 Support
If your graphics card meets the minimum requirements above, Twinmotion uses DirectX12 by default. If your graphics card does not meet these requirements, Twinmotion uses DirectX11. You can change this setting in the Preferences panel, but we do not recommend doing this as it may cause instability in Twinmotion.
To find out if your graphics card supports DirectX12, proceed as follows:
On the Windows taskbar, click the Search icon.
In the search bar, type dxdiag.
In the search results, click “dxdiag Run command”.
The DirectX Diagnostic Tool opens and starts analyzing your system. The DirectX Version is specified in the System Information group box in the System tab.
To verify if Twinmotion is using DirectX12:
In the menu, go to Edit > Preferences to open the Preferences panel.
In the Settings tab under Graphic hardware support, by default the DirectX12 checkbox is selected if your graphics card supports the DirectX12.
Using Multiple GPUs
Twinmotion 2023.1 supports the use of multiple NVIDIA GPUs (Graphic Processing Units) through NVIDIA’s Scalable Link Interface (SLI) technology. Using multiple GPUs (graphic cards) can improve the Path tracer’s rendering performance anywhere from 50% up to 200%. The actual improvement percentage can vary depending on your computer setup, including bandwidth considerations and which GPUs you are using. Note that using multiple GPUs does not accelerate the rendering process when using Twinmotion in Real time (raster) rendering mode.
To set up multiple GPUs, you must be using a computer running Windows 10 version 2004 or later.
Depending on the generation of NVIDIA graphics cards you are using, you may need to set up a physical connection (bridge) between them using an NVIDIA NVLink or an SLI connector.
Once you have set up the NVIDIA SLI technology for the GPUs in your computer, you need to enable the feature in Twinmotion as follows:
In the menu, go to Edit > Preferences to open the Preferences panel.
In the Settings tab, under Path tracer, select the Multi-GPU checkbox.