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how to disable an object from casting a shadow

Drogo NazhurDrogo Nazhur Posts: 1,356
in The Commons

what settings do I need to change so an object does not cast a shadow during a render

Comments

  • LeanaLeana Posts: 13,659

    AFAIK you can't do that with Iray

  • Richard HaseltineRichard Haseltine Posts: 112,037

    Do a second render without the shadow casting item, then layer them in an iamge editor. You may be able to reduce the shadow with a large light source, but that wil obviously affect other aspects of the lighting too. Or adjust the lights so that the shadow is not visible.

  • jmucchiellojmucchiello Posts: 2,694

    The second render trick isn't always easy, especially if other objects in the scene reflect the item casting the shadow. But I've used that trick many times.

  • MasterstrokeMasterstroke Posts: 2,523
    edited October 21

    Drogo Nazhur said:

    what settings do I need to change so an object does not cast a shadow during a render

    In any PBR renderer like IRAY, just think about it like having a real life scene. What would you do?
    Place a light source directing on that shadow you want to make invisable. That's not perfect, but that's how it is done in the real world. 

    Post edited by Masterstroke on
  • DasTriDasTri Posts: 272

    I suggest the double render, too.

    Then put both images into GIMP (or PS) into the same image, but different layers, the one with shadow on top.

    Then delete anything that is shadow, exposing the image done without below.

     

     

  • jmucchiellojmucchiello Posts: 2,694

    DasTri said:

    I suggest the double render, too.

    Then put both images into GIMP (or PS) into the same image, but different layers, the one with shadow on top.

    Then delete anything that is shadow, exposing the image done without below.

    Instead, in GIMP, apply a layer mask. Paint the mask black where the shadow is, white otherwise. In GIMP 3.2, the layers can be link layers connected to wherever you store your renders. This way if you rerender, the GIMP file updates automatically.

     

  • Drogo NazhurDrogo Nazhur Posts: 1,356

    thank you

  • garrett_3dgarrett_3d Posts: 1,098

    In this case I would render the scene with the object hidden. Then I hide the scene and unhide the object, elevating the object from the floor plane, this results in no shadow or a shadow unattached to the object (which makes deletion easier). Then layer it in your chosen image software.

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