how to create custom bump map for keyshot and others???
https://purdy.gatech.edu/tutorials/showcase/
https://www.smart-page.net/blog/2009/02/22/pixel-bender-realtime-normalmap/
software for create custom bump map.
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Step 1:
open file in smart-page site or in smart-page software
which is totally free
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Step 2:
than after change setting as per your requirement.
Than after save it.
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Step 3:
enjoy it.