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  • Area light – leaking through objects

    Posted by Brian Murphy on October 19, 2022 at 4:29 pm

    Hi all,

    I have several area lights that reference sweep objects (converted to mesh) to have them simulate neon lights.

    Using the Physical renderer in R25, I feel like I’ve gone over the settings way too many times but I experience the following issues:

    1) The light seems to leak through nearby objects. I have tried area and soft shadows and the problem persists

    2) I have cranked up the samples on the light to 1000 (as high as it will go) and I still get strong specks of light that come off of the object onto very nearby objects, not an even emission of the light. Checking the GRAIN option helps spread this out but man, is it noisy. Am using the denoiser in the renderer but would rather have a clean render in the end without filters.

    Thanks for any help!


    Brian Murphy replied 1 year, 3 months ago 2 Members · 2 Replies
  • 2 Replies
  • Boston Cainfra

    March 16, 2023 at 12:35 am


    Using area lights that reference sweep objects in Cinema 4D R25’s Physical renderer seems to be giving you some lighting problems in your scene.

    Use these

    Check your light’s shadow bias settings to see if they need to be changed if light is coming through neighboring objects. The Details tab for your light object contains the shadow bias parameters.

    Even with a lot of samples, your render can still have some noise or speckling. Increasing the min and max samples settings for your renderer is one approach to fix this. To lessen the amount of noise in the scene, you may also try modifying the noise settings for your lights and materials.

    You can also try using other render engines like arnold or octane

    Have a nice time

  • Brian Murphy

    March 21, 2023 at 4:35 am

    Thank you for the detailed information!

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