Speed Up The Cinema 4D Physical Render By Removing The Color Channel!

April 25, 2017 - By 

Cut your Physical Render Time in Half with this time saving Cinema 4D Tutorial. Optimize the Physical Renderer for speed with Reflectance.

Watch This Short Tutorial

Tutorial Notes:
Join our Intro to Cinema 4D Series
Learn how to set up Team Render in Cinema 4D
Set up an Interactive Viewport in Cinema 4D

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34  comments
34 Comments
  • Wow! Awesome Tip!!! thank you so much for that.

  • This is gold!!! thanks!!

  • Holy crap, Nick, this is AWESOME! Thank you, man!

  • This technique was pioneered by Pavel Zoch, might be nice to mention that.

    http://www.c4d.cz/article.aspx?a=127

    • Cool. I haven’t personally seen his technique, but it’s nice to know that there are others that are looking into how to make the Physical Renderer work faster.

    • I’m guessing this is mostly useful for scenes that use Global Illumination. I just tried it on a standard scene and it took a little longer and lost some shadow/AO detail. I bought Pavel’s videos, but this technique renders pretty slow for animation in my experience. I’ve gotten amazing results using the Corona Renderer for C4D (currently in alpha, but free to use) and way faster render times. Results are in the V-Ray category.

  • A small extract from the Cinema 4D Help:

    “Lambertian (Diffuse), Oren-Nayer (Diffuse): These modes are somewhat different in that they are diffuse models (i.e., ,perfect’ matte reflections). They produce a result similar to the material channel Color (which doesn’t reflect). These channels should be used with caution (they can’t be cached by GI’s Irradiance Cache) and are basically only available for reasons of compatibility. The Color channel should be used instead, also because it simply renders faster.”

    Thanks for your tutorial Nick!
    Just curious: how come MAXON seems to tell us the Color channel is faster and the diffuse from Reflectance should always be used with caution?

    Thanks again!

    peter

  • You compare color channel +GI versus no color + no GI
    In my test the diffuse reflectance channel is slightly slower that the color channel…

  • To be honest: I just converted all my materials to ‘Reflectance materials’ by moving my shaders/colors from the Color channel to a Reflectance – Diffuse channel, and though the result seems to be more realistic, the render times are going through the roof and I suddenly have noisy renders.

    What am I doing wrong here?

    Many thanks again!

    • Wait, I think I get it:

      It’s about going from GI + Color to NO GI + Reflectance, right?

      • I have the same problem. My rendertimes are much longer and the results are much noisier. What am i doing wrong?

        GI is deactivated and all color materials are in the reflectance channel

  • Lucas Alan Fischer April 26, 2017 at 7:34 pm

    What if you want to use GI? Would the render time still be decent?
    Haven’t done test yet.

    This technique would’ve saved me so much time on my architecture project.

  • “Lambertian (Diffuse), Oren-Nayer (Diffuse): These modes are somewhat different in that they are diffuse models (i.e., ,perfect’ matte reflections). They produce a result similar to the material channel Color (which doesn’t reflect). These channels should be used with caution (they can’t be cached by GI’s Irradiance Cache) and are basically only available for reasons of compatibility. The Color channel should be used instead, also because it simply renders faster.”
    I knew I had read something about this somewhere so thanks for putting it up. So how come Nick’s trick saves so much time?

  • This technique is basically explained more thoroughly here:

    http://www.c4d.cz/article.aspx?a=127

    Well worth the $50 I think to unlock something that most people overlook in C4D.

    P.S. I am in no way affiliated with Pavel, just a customer and I think the more people know about this the better!

  • I was convinced I would learn nothing from this one, having experimented lots over the years, how wrong was I.

    Thanks again!!

  • This is one of the greatest tips I’ve learned about cinema 4d for years.
    Thank you very much, Nick!

  • I think this is because of the GI, since you have GI disabled in the final render it will render much faster regardless of color / reflections / etc.

  • Awesome tutorial. Thanks, Nick!

  • nick can you post the link for team render?

    Thank you

  • Interesting Technique.
    I tried to convert a project I had already done and ran into an issue. I have the Greyscale Gorilla Texture Kit Privacy Sandblasted on a texture in the scene and when I try to paste the Lambertian over to the reflection channel I can’t get the texture to look the same as it does originally.. It loses the “Ghosted whiteness” of the sandblasted effect that is in the texture preview. Are reflective/transparent textures an issue in this approach?

  • Hi there, for some reason this method does not work for me, when I add the layer on to my reflection exactly as you say here, nothing happens, the colour stays the same, not sure if the reason is cos i have layers in Environment, Fog and Diffusion too, any idea?

  • Floor shadows seem to disappear with this technique?

  • hey where is nab 2017 presentations videos??
    no release dish year??

  • Awesome Nick thank you!

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