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Activity Forums Maxon Cinema 4D Weird Alpha behavior

  • Weird Alpha behavior

    Posted by Adam Claude jones on July 8, 2009 at 3:03 pm

    I’m finding some weird alpha channel behavior in a scene I’m working on. At least I think it’s the alpha. I’m using PSD files for a matte painting for background. I applied the matte painting as a texture to a plane primitive. The matte painting has buildings but without a sky so I can use Cinema 4D’s sky. But even though the sky part of the matte painting seems fully transparent, when I render you can see a white line where the plane object ends. Why is that?
    Thanks.

    Brian Jones replied 16 years, 10 months ago 2 Members · 2 Replies
  • 2 Replies
  • Adam Claude jones

    July 9, 2009 at 9:19 pm

    Anybody?

    I have no idea how to fix it? Has anybody experienced this too? Thanks.

  • Brian Jones

    July 10, 2009 at 3:46 am

    probably caused by antialiasing in the PSD file, don’t know what the solution sill be for sure but you can try using Straight Alpha instead of Premultiplied (or vice versa) if that doesn’t do it you have to make the file differently so the antialiasing doesn’t fade to white (I’d have to post a file rather than describe that so hopefully the change of alpha does it)

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