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Fixed in 2017.3.0f3

Fixed in 2017.1.X, 2017.2.X



Found in


Issue ID




[MotionVectors] z-bias applied to motion vectors reduces precision

Post Processing


z-bias is applied to motion vectors to match the z-bias required for precision loss when multiplying matrices for dynamic batching. This reduces precision in motion vectors even when dynamic batching is disabled.

Repro steps:
1) Open project and scene "Repro"
2) Enter play mode (motion vector debug is enabled)
3) Notice how the motion vectors are "leaking" through the front cube

Actual result: Motion vectors are "leaking" through the front cube
Expected result: Motion vectors do not leak

This is fixed by this PR:
Fix is tested and confirmed against this repro in trunk

Reproduces in 5.6+

Comments (2)

  1. itadakiass

    Feb 10, 2022 10:28

    and 4 years more :) Thats unfortunatly is how Unity designed it:

    I have no idea how to use TAA without artifacts :|

  2. SmShadows

    Aug 01, 2018 19:34

    I still have the motion vector issue bleeding trough walls on all 2017 versions I tried (even in 2017.3.0f3).

    This is sad that such an obvious bug is still present. Object behind walls are casting motions blur from behind walls, and TAA is unusable, I have seen that bug in a couple of shipped unity games. This makes motions vectors useless, and it has been like that for years.

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