Add Global Bump

MDL Identifier: core_definitions::add_globalbump

Description: Adds global bumpmap to existing materials. Local bump map of the base material is preserved.

Display Name	Type	Parameter	Default	Description
Base Material	material	base	scratched_plastic_v2()	The material that will get a bump map
Bump	float3	normal	state::normal()	An additional global bump map for the material. Local bump map of the base material is preserved.