When you shade objects, you should pay close attention to

You should pay close attention to light, shadow, and shape relations. hope this is helpful

Thom bell , bobby martin , and norman harris .

Fist of all, you need to learn about cad and architecture or basic engineering or architecture drawing in order to prorperly use and utilize cad programs.it's as abbreviated computer-aided-drafting. it will the user acquire skills faster since it's aided by technology