Get halfway through a model and find it's an unworkable mess? Can't add edge loops where you need them? Can't subdivide a mesh properly? If any of this sounds familiar check this course out.
Adjusting roll off on a Blinn should work but I've found using a PHONG E shader and adusting its ROUGHNESS attribute to work very well. Set it at 2.0 or higher for a really sharp hotspot.
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