Hi Ying,
Hi Sebastian ,

The distortion will be applied to the 3D model's vertexes. So each vertex will 
be changed to a different position. I wonder how could I achieve this? Should I 
use 3D texture, and then applying the distortion to the coordinates of the 3D 
texture?
I'm aware how distortion work I rather wanted to know if the distortion value is per vertex and is constant or changes over time. So we need to know if the distortion is a function of time, vertex index, position or whatever.

Try to describe the problem more in depth so we can get an idea of what you are trying to achieve.

Cheers
Sebastian

Thank you for the answer! :)

Cheers,
Ying

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