The Bump tab is part of the V-Ray Material parameters.
Bump
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Bump Map – Allows you to select a texture for the bump or normal map. Leaving this unconnected turns off bump/normal mapping.
Bump Amount – A multiplier for the bump map effect.
Bump Type – Determines how the Map parameter is interpreted.
Bumpmap – Applies the map as a bump map. Normal map Map in tangent spaceTangent Space – Applies the map as a normal map in tangent space. Normal map Map in object spaceObject Space – Applies the map as a normal map in object space. Normal map Map in screen space Screen Space – Applies the map as a normal map in screen/camera space. Normal map Map in world spaceWorld Space – Applies the map as a normal map in world space. From texture bump outputTexture Bump Output – The map is applied as determined by map type itself. Explicit normalNormal – Applies the map as an explicit normal.
