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about motionblur alpha

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JHsong
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I seperated my scene each other have velocity motionblur. When I combine these, There is some boundary at between in Nuke. How can i do for remove the boundary?
Edited by JHsong - Dec. 22, 2021 08:04:24

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jsmack
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Use a Plus instead of an Over. When layers are mutually held-out, the background layer is already pre-multiplied by the front layer's alpha complement. Using an Over pre-multiplies it again, resulting in an edge. Plussing it combines the layers as if they were samples in the same render pass.
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JHsong
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jsmack
Use a Plus instead of an Over. When layers are mutually held-out, the background layer is already pre-multiplied by the front layer's alpha complement. Using an Over pre-multiplies it again, resulting in an edge. Plussing it combines the layers as if they were samples in the same render pass.

Thanks! It works as I thought.
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