Redshift Stuck on Initializing OptiX RT

How to fix it

Try these in order — the most common fix is first.

1. 1. Update the NVIDIA driver

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   1. Install the newest driver
   2. Do a clean install if the problem persists
   Did this fix it? Yes No

2. 2. GPU only

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   1. Open Render Settings > Redshift > System
   2. Uncheck CPU support so only the GPU is active
   Did this fix it? Yes No

3. 3. Turn off hardware ray tracing for testing

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   1. Disable it during viewport or progressive testing
   2. Expect some render speed loss
   Did this fix it? Yes No

Symptoms

The render or IPR sits on Initializing OptiX RT for a long time.

Why it happens

• Problematic NVIDIA driver version
• CPU rendering enabled alongside GPU
• First-time kernel compilation

This guide also covers

• redshift stuck initializing optix rt
• redshift initializing optix rt cinema 4d

Other Cinema 4D errors

• Cinema 4D Sign In OK, Waiting for Maxon App
• Cinema 4D License Not Found or No Offline License Found
• Cinema 4D Crashes on Startup
• Redshift Missing or Not Loading in Cinema 4D
• Redshift Error: Missing or Corrupted Shader Kernel
• Redshift Out of VRAM in Cinema 4D
• Cinema 4D Viewport Slow or Laggy
• Cinema 4D Crashes While Rendering