DISPLACEMET MAPPING
Hello! Thomas it's for you !!
1 . pre-production
1) idea sketch & detailed workflow planning

2. production
2-1 base material & connecting displacement node
Get > primitive > grid
geometry > u , v 50 or more

material > phong > illumination > diffuse

material > phong > transparency / reflection

select grid > press 7
make render tree structure like below

where can we find color to alpha node ?
the answer is below

double click image node > define projection ( planar xz )

drag q

good !