# FAQ


## Is the AI feature free?

AI mode is currently in testing and is free to use during the test period.

## Does AI mode need an internet connection?

Yes. AI generation runs in the cloud, so stay connected and signed in to your D5 account while using it.

## What should I do if AI generation is queued or fails?

1. During peak hours, generation tasks may be queued. Wait a moment rather than submitting again.
2. If generation fails, retry directly in the current interface. If it keeps failing, or the service is completely unavailable, contact online support.

## Installation fails, or an error appears on launch

Try the following, in order:

1. Close D5 Render. Lite and D5 Render cannot run at the same time.
2. Confirm your computer meets the [system requirements](/lite/system-requirements.md): Windows 10 (20H2 or later), an NVIDIA RTX 20-series or newer GPU, and GPU driver 528.33 or later.
3. Update D5 Lite and try again.
4. If you have a legacy LiveSync plugin installed for SketchUp or Rhino, uninstall it, then reinstall Lite. In Revit, Lite and legacy LiveSync can be installed together and used separately; you do not need to uninstall LiveSync.

If Lite still fails to launch, [contact D5 Support](/d5-account-and-purchase/how-to-get-technical-support.md) with your software version and any error message.

## The interface feels sluggish during use

Try turning off Windows "Hardware-accelerated GPU scheduling": open Windows Settings → System → Display → Graphics → Advanced graphics settings, turn off "Hardware-accelerated GPU scheduling," then restart your computer for the change to take effect. Reopen your modeling software and D5 Lite afterward.

## SketchUp closes unexpectedly when applying a material

Some newer SketchUp versions may close unexpectedly when applying a material. In SketchUp settings, switch the graphics engine to "Classic" and try again.

## Why is my emissive material completely black?

Emissive materials are not affected by ambient light; when emission intensity is 0, the material appears black. Set the emission intensity above 0. For a non-emissive surface, use the **General** template.

## Which interface languages does D5 Lite support? {#the-lite-interface-shows-in-english}

D5 Lite uses Simplified Chinese or English based on your system or modeling software language. It displays Simplified Chinese when that language is detected and English otherwise.

## Why didn't the exposure change after syncing to D5 Render? {#some-settings-didn-t-carry-over-after-syncing-to-d5-render}

Model sync doesn't send a scene's environment or effects, such as HDRI lighting or exposure. Use scene sync to send those settings. Here's how in SketchUp:

1. Save the environment and effects in the Lite **Scene List**. For a new scene, click **Add Scene**. For an existing scene, select it before adjusting the settings, then click its **Update Scene** icon.
2. Save the SketchUp model file, then close Lite.
3. Connect to D5 Render, then click **Send Scenes** on the D5 toolbar in SketchUp. Select the corresponding scene in D5 Render and check the result.

Use a D5 Render version that supports scene environment and effects. Versions with the older scene interface receive the camera only. A `.d5a` export does not include the recorded environment or effects. For Rhino and Revit, see [Sync to D5 Render](/lite/scene-list.md#sync-to-d5-render). In Revit, this works with perspective 3D views from the Revit project.

## D5 Lite crashes on launch with multiple GPUs

If your computer has both an integrated GPU and a dedicated NVIDIA GPU, first set a graphics preference for your modeling software:

1. Open Windows **Settings → System → Display → Graphics** and add or select SketchUp, Rhino, or Revit. Under **Options**, select **High performance** and check that it lists the dedicated NVIDIA GPU. Save the setting.
2. Restart your modeling software and launch D5 Lite again. If Windows doesn't offer that choice, check **NVIDIA Control Panel → Manage 3D settings → Program Settings**. If **Preferred graphics processor** is available for your modeling software, select **High-performance NVIDIA processor**, apply the setting, and try again.
3. If Lite still crashes, [contact D5 Support](/d5-account-and-purchase/how-to-get-technical-support.md). Include your modeling software version, D5 Lite version, GPU model and driver version, and any launch error.

## Changes to my model or camera don't appear in Lite

- **Model changes:** In your modeling software, check that Lite is running and **Live Sync** is on. If you keep it off, click **Sync Once** to send the latest changes.
- **Camera changes:** Turn on **Sync Viewport**. To match the view once while it is off, focus the Lite viewport and press **0**.

See [Real-time rendering & sync](/lite/real-time-rendering-and-sync.md) for the controls and exceptions in your modeling software.