Loading...
> >

Shadows projected on background, no 'Occlusion off' option?

HorusRaHorusRa Posts: 1,664
edited September 2015 in New Users

Sometime ago when I was a total noob with Studio I was getting shadows casting onto backgrounds and someone told me to simply go to surfaces on that object and turn Occlusion to Off. That worked, and I have always remembered that. However, on a halloween scene I'm working on I'm using one of the Millenium Environments and corn stalks are casting shadows on the backdrop and lo and behold for some reason it does NOT have the Occlusion entry. Any ideas on what would give occlusion sometimes but not other times? Ideas, solutions? Render engine: IRay.

Thanks
Rob

Post edited by HorusRa on

Comments

  • ToborTobor Posts: 2,300

    Were you using 3Delight before? Iray doesn't have an Occlusion Off mode, but it does have some shadow controls, IF you are using Interactive mode rather than Photoreal mode (Render panel, Render Mode). You can control shadows in this mode.

    If you are using Photoreal mode, there are ways to stop shadows from (mostly) falling on a backdrop, but it's slightly involved, and it would be better if you first confirmed what Iray mode you are wanting to use.

     

  • HorusRaHorusRa Posts: 1,664
    Tobor said:

    Were you using 3Delight before? Iray doesn't have an Occlusion Off mode, but it does have some shadow controls, IF you are using Interactive mode rather than Photoreal mode (Render panel, Render Mode). You can control shadows in this mode.

    I may have been using 3Delight, that could be, but I wouldn't remember anymore.

    Tobor said:

    If you are using Photoreal mode, there are ways to stop shadows from (mostly) falling on a backdrop, but it's slightly involved, and it would be better if you first confirmed what Iray mode you are wanting to use.

     

    I am using Photoreal, yes. =/

  • HorusRaHorusRa Posts: 1,664
    edited September 2015

    Oops, looking through my daz notebook on that past subject it wasn't Occlusion, though I remember that being said somewhere. My mistake. Someone told me, according to my notebook, that if shadows are being cast on the millenium backdrop to take the Diffuse texture and place it also in the Ambient channel, along with some other setting they gave which I have written down there too. Sorry my mistake. However I'm still up for new procedures and knowledge, just in case anyone still feels like elaborating. Not sure if this method I have written down works only in 3delight or not, thats a whole different thing there. We'll see.

    [edit]: No, nevermind, that may not work, don't know if it's just IRay or not, but there is no Diffuse or Ambient channel texture. Darn. Problems.

     

    Post edited by HorusRa on
  • ToborTobor Posts: 2,300
    edited September 2015

    There's no Ambient channel in an Iray shader. You may be thinking of Emission Color.

    But you may have better success turning the backdrop into a matte object. It's not hard, but involves a few steps. Here's a short ste-by-step to get you started:

    http://www.daz3d.com/forums/discussion/comment/830052/#Comment_830052

    The idea is that you create a plane that "catches" the shadows. Place the plane in front of the backdrop, and the shadows will not reach the backdrop. When the matte object node is added to the plane, it becomes invisible in the scene when rendered, but "eats" the shadows (or most of them, unless they are very strong).

     

    Post edited by Tobor on
  • HorusRaHorusRa Posts: 1,664
    Tobor said:

    There's no Ambient channel in an Iray shader. You may be thinking of Emission Color.

    But you may have better success turning the backdrop into a matte object. It's not hard, but involves a few steps. Here's a short ste-by-step to get you started:

    http://www.daz3d.com/forums/discussion/comment/830052/#Comment_830052

    The idea is that you create a plane that "catches" the shadows. Place the plane in front of the backdrop, and the shadows will not reach the backdrop. When the matte object node is added to the plane, it becomes invisible in the scene when rendered, but "eats" the shadows (or most of them, unless they are very strong).

     

    Sounds good, thanks. yes

  • AbnerKAbnerK Posts: 718

    Hi, 

     

    I tried the shadow catcher but my shadow catdher wasn't invisible. I got around by moving the background further away and increasing the scale but you'd think there'd be an easier way of doing it. Have I messed something up with this? I did it twice but it made no difference. I use shadow catchers on the ground when I'm rendering multiple versions of the same scene so I don't have to render the background each time. 

Sign In or Register to comment.