BatchedMesh: Change visibility to use a zero-scale matrix #27043
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Related issue: #25059, #22376
Description
BatchedMesh was using a matrix full of zeros to "hide" a geometry - but when multiplying a homogenous vector 4 position by this matrix you get a 0 in the w component which isn't correct for a position coordinate. This PR changes the hidden-visibility matrix to use a 1 in the final field to ensure the w remains untouched.
cc @takahirox