Boost for Daz Knowledge Base
  • 🚀What is Boost for Daz?
  • Getting Started 101
    • What is Rendering? Why do I need it?
    • How does Boost for Daz work?
    • Does Boost for Daz work with 3rd party content/assets?
    • How does Boost for Daz help me?
    • Where is Boost for Daz in the cloud?
  • Basic Requirements
    • What do I need to use Boost for Daz?
    • Daz Studio version compatibility
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    • How does Boost for Daz help me?
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  • Using Boost for Daz
    • Will Boost for Daz replace my existing computer?
    • Setup & Configuration
      • Optimizing your rendering experience
      • Picking a GPU for rendering
      • Steps for Rendering - Streaming or Queuing
      • I Cannot Find/See the Bridge Tab!
    • Rendering with Boost for Daz
      • Rendering Modes
        • Render Stills and Animations?
        • Are Streaming and Queued render modes supported?
        • Showing background HDRI images when using Iray Server Queue
        • Render support for Canvases (in Daz Studio)
      • Building the Render Package
      • Uploading Render Package
        • File Upload Times
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        • Important Daz Studio Settings
      • Rendering the Daz Project
        • Rendering Modes
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        • Interrupted Renders
        • Streaming vs Queuing Modes
        • Quick Guide to Iray Server Admin + Queue Management
        • Using Auto-Shutdown Timer
        • Save and Reuse Iray Server Queue Session Data (for 24 hours)
        • Black Screen When Rendering?
        • Why is my render taking so long?
      • Rendering Animations with Boost for Daz
    • Post Render Options
      • Download Render (via Queue) Results (ZIP file) - 7-day window
      • Access Iray Server Logs (10 day window)
    • Pricing & Billing
      • Render Pricing
      • Estimating Costs
      • Payment Methods
      • Update Billing Data
    • ⚠️Signing Out/ Terminating a Session
      • Ending a Session
      • What Happens to my Uploaded Files?
    • ⚒️Troubleshooting & Technical Support
  • Extras
    • Public Release Launch Details
      • Boost for Daz 1.5b (Public Release)
      • Boost for Daz 1.5a (Public Release)
      • Boost for Daz 1.5 (Public Release)
    • Speed Factor of GPU Variants
    • Top Tips & Tricks
      • Pick the right GPU for your specific Project
      • Make sure you have a valid payment option with enough funds
      • Ensure optimal computing environment
      • Is Your Internet Upload Speed Enough?
      • Access Real-time Iray Server Logs
      • The Secret of the Cache
      • Sample simple .DUF file
      • Iray Server settings to maximize render performance for large format (> 2000x2000) scenes
    • Goodies
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  1. Using Boost for Daz
  2. Rendering with Boost for Daz
  3. Rendering the Daz Project

Why is my render taking so long?

Are you seeing looping render iterations in your Iray Server logs? You may have run into an Iray Server bug. Here's what you can do...

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Last updated 1 month ago

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We are working directly with the NVIDIA Iray Server team to validate and resolve this issue (resolution time is unclear at the moment), but fact is that there is a bug that occasionally pops up its ugly head - unpredictably - for jobs that are submitted to the Iray Server queue of any size, but probably for jobs near or over 4megapixel (2000x2000)

Issue Explained

Your instincts as a Daz artist are well honed to when you feel that a 'render should be done by now'. That's important to acknowledge and appreciate.

So when you sense that a renders appear to be taking longer than it needs to when running queued renders, you check in the logs and see that the render seems to be stuck at a specific iteration and keeps resetting back to iteration 1.

The essence of this issue lies in a Iray Server parameter called Canvas Update Interval. This value tells Iray Server how often to write the results of the active render job to disk. This bug manifests itself when Iray Server starts the render process over again at the canvas update interval.

This is the reason why your render is taking long. It's stuck in loop...and its wasting your time and money. So how do you reduce the chances of this happening to you? That's next.

Solution Explained

The Iray Server parameter called Canvas Update Interval can be viewed and changed through the Setting page in the Iray Server Admin application. You can learn more about accessing and using Iray Server Admin .

The default canvas update interval for Iray Server is set by NVIDIA to 8 seconds but that might not be enough for these larger projects when the bug is triggered.

Follow these steps to effectively prevent the chances of this happening to you:

Step 1 - Fine Tune Convergence and Max Iteration Values

Do some fine tuning that can help reduce the render burden and duration for your project. Based on what we've seen in advising many established Daz artists, we recommend taking a good, hard look at your Convergence and Maximum Iterations values.

As you know, your render will (technically) be complete when either one of these values in reached first - either Convergence or Maximum Iterations.

Many Boost for Daz customers feel that .95 convergence is overkill, and recommend that most should target .85 for still images and .70 for animation frames.

Then consider if its possible to reach that Convergence level is less iterations. Pick the minimum Max Iterations value that you feel will get you the desired Convergence level. If not, change and render it again. (You will not have to upload any Daz files after the initial upload, so any subsequent renders happen are completed quicky).

Setting the minimum viable Convergence and Max Iterations values will help optimize the time, expense and quality of your renders.

Step 2 - Pick the RIGHT GPU for your specific project

Step 3 - Change the Canvas Update Interval value

Be sure to choose a GPU (or set of GPUs) that can get the job done in that time frame. The trick is in ensuring that your project fits entirely into the VRAM with some (acceptable) room to spare. .

Change the Canvas Update Interval to 9000 seconds (=2.5 hours) prior to starting the queue.

Learn how to roughly size and pick for the right GPU for your project
Learn how to configure Iray Server Admin for large project sizes.
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