ArtStation - 3ds max 2D render material(Normal map applied)

ArtStation - DDTextures - Water Normal Maps

SIMPLIFIED NORMAL MAPS AND HOW TO CREATE YOUR OWN

The Toolbag Baking, Texturing, and Rendering Handbook

Bump Mapping Without Tangent Space in Unreal Engine

ArtStation - Understanding 3D Model Optimization: A Key to Enhanced Gaming Experience

ArtStation - Understanding 3D Model Optimization: A Key to Enhanced Gaming Experience

This resource pack contains 60 Height / Alpha Maps, generated primarily with GIMP render filters built around sine and/or cosine functions, then

60 Sinusoidal Displacement/Alpha 4K Maps (Seamless) | Set-C

ArtStation - 100 VDM Brushes , Wrinkle Brushes + 3D model & 2 Video Tutorials

This resource pack contains 80 Height / Alpha Maps, generated primarily with GIMP render filters built around sine and/or cosine functions, then

80 Sinusoidal Displacement/Alpha 4K Maps (Seamless) | Set-B

Full Photogrammetry Guide for 3D Artists