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  • overlapping planes alpha mask problem

  • Andy Stokes

    May 16, 2010 at 4:21 am

    Hi all,

    Ok so I have a plane with a material applied containing an image in the luminance channel and a mask in the alpha channel. I’ve duplicated them with a cloner and I’m using the spline effector to modify the position and animate the clones.

    There is a problem however with the clones when in some places they overlap. The image itself is fine, but the alpha mask instead of cutting out the object shows through the background color instead when rendered.

    I’m guessing this problem is since they’re occupying the same Z-depth. I’ve found that if I move some points of the spline forward slightly this fixes the problem, however I wanted to keep the splines “live” (i.e: not editable)

    I’m just wondering if anyone may have a work around?

    I also have a problem if I use these same clones above a reflective floor. The floor reflection of the image is fine, but the alpha mask is ignored in the reflection. Any thoughts?


  • Adam Trachtenberg

    May 16, 2010 at 11:17 pm

    It’s possible that it’s a coincident face issue, but it’s more likely a ray depth problem. Render Settings>Options>Ray Depth determines how many transparencies Cinema can see through. Try increaasing the number.

    If it is a coincident face problem I would use a random effector to give the clones a very slight rotation.

  • manojit ghose

    August 22, 2021 at 3:04 pm


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