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Object touching plane = weird effect

psfilipepsfilipe Posts: 164
in New Users

Hi,

I have this weird effect in one of my latest works.

When an object goes through a plane (ground in this case) there's a strange light effect going on (please see red highlight in attached render).
I have a distant light, below the ground plane, with no shadows pointing upwards as a sort of bounce light and I thouhgt that was the problem.
Unfortunately that's not the case. Even with that light switched off I have this problem.

Can anyone out there help me out? Much appreciated.

.p
 

 

test.jpg
700 x 700 - 270K

Comments

  • mjc1016mjc1016 Posts: 15,001

    Renderer?

    Render settings?

    Shader used on figures?

  • fixmypcmikefixmypcmike Posts: 19,565

    If this is 3Delight using the AoA SSS shader, make sure the different surfaces have different ID's

  • psfilipepsfilipe Posts: 164

    Hi,

    Sorry, here's some details

    Renderer: 3Delight
    Render settings: Non progressive, shading rate: 0.50
    UberEnvironment settings: Please see attached image.

    Only object I have with a texture is the cyclorama behind the humanoids. No reflections and a bit of Glossiness (87%).

    Thank you for answering guys! :)

    .p

     

    Untitled-1.jpg
    293 x 594 - 69K
  • mjc1016mjc1016 Posts: 15,001
    edited September 2016

    No other lights?

    This is a very old problem with 3Delight (RiSpec renderers in general).  If you don't have any shadow casting lights (or aren't using raytraced shadows) or have the shadow bias too high/low and a host of other things you can get this.

    You mentioned a distant light pointing up...that's the one that needs the shadows on.

    Post edited by mjc1016 on
  • psfilipepsfilipe Posts: 164

    I have more lights. One above the whole scene. One below (with no shadows, otherwise it wouldn't go through the cyclorama) and a side fill.
    What's strange is that even if I enable the shadows in the light below the strange effects still happens.

    I know I can fix it in post but I really would like to know what the hell I'm doing wrong :)

    .p

     

  • mjc1016mjc1016 Posts: 15,001

    You need to set the Cyclorama to not cast shadows (in Parameters) and have raytraced shadows enabled on the light below...then adjust the Shadow Bias as needed.

  • psfilipepsfilipe Posts: 164
    mjc1016 said:

    You need to set the Cyclorama to not cast shadows (in Parameters) and have raytraced shadows enabled on the light below...then adjust the Shadow Bias as needed.

     

    Thank you, tried all that too. Unfortunately it didn't work :(
    It might be a bug indeed.

    Cheers,

     

    .p

  • jestmartjestmart Posts: 4,449

    It may be the ambient occlusion setting of the UberEvironment.

  • mjc1016mjc1016 Posts: 15,001

    I cn't think of anything else at this time...

  • fixmypcmikefixmypcmike Posts: 19,565

    What shader is being used on the figure and the floor?

  • srieschsriesch Posts: 4,241
    edited October 2016

    .

    Post edited by sriesch on
  • srieschsriesch Posts: 4,241
    jestmart said:

    It may be the ambient occlusion setting of the UberEvironment.

    Which parameter(s) specifically?

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