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New to iray

LuzfenixLuzfenix Posts: 57
in New Users
I was wondering if there was a way to speed up render times with iray. I'm using all default iray render settings. So whatever it was set to on install it is that. And as I have only ever seen CPU in the advanced settings, I'm guessing my GPU is not compatible with using that instead. Which does not surprise me, as I only own a laptop. And it's not a new ish one either. So I'm wondering is there any settings I can do to speed up CPU only renders. If not, then it's fine. I am used to rendering things over night, I do it all the time when making fractals for sale.

Comments

  • BeeMKayBeeMKay Posts: 7,019

    First of all, welcome! smiley

    You GPU has to be an NVidea GPU. If you are using an on-board GPU, it most likely will not work with Iray. If you have an Nvidea graphic card in your laptop, it's worth updating the card driver; this in some cases makes the card available for rendering.

    To increase CPU-rendertimes, there are various options, but it depends on your scene. Enough light is a factor. Also, in the Advanced Render settings is an Acceleration setting, which gains you a bit.

     

  • LuzfenixLuzfenix Posts: 57

    thank you :D i've been here awhile just only just started posting n.n

    I am pretty sure my GPU is not nvidia. which is why no GPU is appearing i believe.

    here is the scene im currently working on.

    it was set to stop rendering at 100 iterations, because i saw something like you can do that, so that you can tell when to stop rendering?

    do it to smaller images first, then when you know how many iterations you need, do the larger piece or something?

    and it took 4 minutes to get to 100 iterations.

    there's 5 lights in the scene. 

    1 eye specular

    2 rim lights (1xL, 1xR)

    1 Key Light

    1 Background Light. 

    I don't know if 4 minutes is good. But I feel like it is bad. Considering 100 iterations is not alot

    eh.png
    500 x 375 - 501K
  • EsemwyEsemwy Posts: 578

    In addition to the video driver, you need the CUDA driver. It's a separate download from Nvidia. 

  • Richard HaseltineRichard Haseltine Posts: 102,882
    Esemwy said:

    In addition to the video driver, you need the CUDA driver. It's a separate download from Nvidia. 

    Not for Windows.

  • LuzfenixLuzfenix Posts: 57
    So should I not bother with using iray and go back to Luxus? Because the render times are pretty much the same so it doesn't matter to me which I use. As I'm getting almost the same results.
  • BeeMKayBeeMKay Posts: 7,019

    Well, you can try Optix Acceleration in the Advanced tab. Also, rendering a larger image sometimes helps getting the times down.

    But if you are more comfortable with Luxrender, it might be easier for you... though a lot of the new items in the store have materials that are optimized for Iray, and will need conversion when you render them in LuxRender.

  • DekeDeke Posts: 1,635

    Welcome to iray. It was a big learning curve for me using Daz 4.8 and shifting from 3Deluxe to iray but the results are worth it for me.  I'm doing animation and try to keep my per frame render time to under 2 minutes, ideally under a minute.  You can play with settings like ISO and aperture and that sometimes speeds up rendering. I handle animation by testing motion with small low res renders, then do larger still renders (720 wide) in Iray to adjusting lighitng. Then I render the full shot in 1920 p. I also render in layers so each shot can be comprised of a handful of separately rendered layers. I either place a limit on the duration of the render or the number of iterations.

  • LuzfenixLuzfenix Posts: 57

    @BeeMKay, I tried the Optix Acceleration, it made no difference at all to render times. I only have a slight bit more knowledge of Luxrender, so basically I am still a beginner using both Iray and Luxus, which is why I wondered which to learn in another forum post.

     

    @Deke, are you using CPU only though?

     

    This render, I don't know how long it took but it was default settings, including default iterations. Not sure 100% how long it took I just know it was over 2-3 hours, as i went out and came back to it finished

    ehdraft.png
    1000 x 750 - 1M
  • DekeDeke Posts: 1,635

    The CPU and GPU was part of the learning curve. I am running on a 2008 mac tower and put two cuda GPU into it with an external power supply as they are power hogs.  So that is a factor. If I were to get more serious, I'd look to an even more powerful machine with more cuda core GPUs.

  • LuzfenixLuzfenix Posts: 57
    I thought you were as that time sounds very fast for a cpu only render.
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