How can i reproduce this effect?

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I found this weird “ghosting” effect that happens on this specific MeshPart when it has the glass material applied to it. I know what you’re thinking, “hasn’t this been covered like 1000 times already?”. No, this effect is different than the “glass with a highlight” thing.

Whats weird about this it, the effect only works if the mesh transparency is at 0, anything above and it breaks. Another thing is the mesh cannot be recolored, its stuck at a black color. Also the “plastic” material appears to be SmoothPlastic but all of the other materials work normally.

Exporting the mesh into blender and re-importing it into roblox studio seems to remove the effect. Looking at the mesh in blender, seems like a normal mesh, the normal’s, the shading, everything’s normal.

Ive tried recreating the mesh by trying different variations of mesh normal’s, vertex colors, shading, and so far nothing.

Here’s what it looks like:

Here’s the model if you want to look at it, all you have to do it change its material to glass, nothing else:

Literally any information on this would be helpful

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my theory is that the dyaminc env maps is bugged on that mesh

that explains the ghosting, dynamic env maps slowly transition to a new env map when you move the camera to another position

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see, i exported the mesh and reimported it with fbx or gltf and it removes the effect

i even exported the mesh as a rbxml file and checked through the properties, found nothing out of the ordinary

something is wrong with the mesh data that is stored in roblox’s own proprietary format, and i dont think anyone has a decoder for it

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okay, i just found how to replicate this. going to make a explanation soon for anyone who may be intrested

EDIT: going to make a tutorial post about this, its not just the glass material that gives cool effects

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