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texturing - How do I subtract an image from specularity of a material in blender? - Blender Stack Exchange
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unreal engine4 - How do I make a file/mesh in Blender to export it as .fbx and import it in UnrealEngine4, to Subtract UE4's geometry from it? - Stack Overflow
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Solution] Box Selection with Shift (Extend) and Ctrl (Subtract) - if Middle mouse is set to select - Usability - Blender Developer Talk
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