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Light leaks in intersection of the solids
Hello,
I have a weird problem. I have two 3D solids intersecting at right angle and a point light behind them. However, the light leaks in the intersection so that I see a vertical narrow chink of light which is of course not desirable. Please see the attached project.
I wonder whether anybody has an idea why it is happening and how I can avoid it. Thank you.
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3 Replies
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Not sure I understand why it’s happening, but I changed your “Light behind” to a spot light and the problem went away.
Johnny Cuevas, Editor
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Thank you for your help Johnny. I can proceed with the project now. 😀 Even if I would still like to know why it happens. 🙂
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Change the blending mode for the layers to Alpha Add. Here’s a not about why from After Effects Help:
“Note: Sometimes, when layers are aligned edge-to-edge, seams can appear between the layers. This is especially an issue with 3D layers that are joined to one another at the edges to build a 3D object. When the edges of a layer are anti-aliased, there’s some partial transparency at the edges. When two areas of 50% transparency overlap, the result is not 100% opacity but 75% opacity, because the default operation is multiplication. (50% of the light gets through one layer, and then 50% of the remainder gets through the next layer, so 25% gets through the system.) This is like partial transparency in the real world. But, in some cases, you don’t want this default blending. You want the two 50% opacity areas to combine to make a seamless, opaque join. You want the alpha values to be added. In these cases, use the Alpha Add blending mode.”
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Todd Kopriva, Adobe Systems Incorporated
Technical Support for professional video software
After Effects Help & Support
Premiere Pro Help & Support
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