What cause this weird reflexions issues?

[NGXG]

Hi, i’m making a transparent material with transmission, but for some reasons reflexions/transmissions seems to be oriented. What cause thi and how to rearange ?

Also i have a second question. On the left, reflexion follows perfeclty flat surface, but on the right it look different. How can I control this ?

[Chaser_Code]

Maybe vertex normals different or material with different values, scale etc. For vertex can try apply

meshLeft.geometry.geometry.computeVertexNormals();
meshRight.geometry.geometry.computeVertexNormals();

[NGXG]

Thanks for this answer, but didn’t change anything. The change appear on the old center of the mesh (I trimmed them), maybe this information could help

[donmccurdy]

@NGXG

…but for some reasons reflexions/transmissions seems to be oriented.

Sorry, not sure what we’re looking at here. Could you share a demo or a .glb?

[NGXG]

demo_file.glb (480.7 KB)
Here is a demo file with the mesh on the right

[donmccurdy]

Probably the main thing to know here is that transmissive surfaces are not visible through other transmissive surfaces in three.js. So the lattice of internal geometry here doesn’t seem like a good choice for transmission, to me. It might be best to use other types of transparency, like alpha blending (material.transparent = true) or alpha hashing, and then work out any remaining issues via draw order and depthTest/depthWrite.