では、CGを作る場合はどのように光源を使用すればよいのであろうか。

、。

So, when creating CG, how should one use light sources?

Literal

Then, CG [object-を] make case [topic-は] how light-source [object-を] use-[if-すれば] good [wonder-のであろうか].

A technical question from an academic or educational text. ~すればよいのであろうか is a literary/formal way to ask 'how should one do X?' — combining the ~ば conditional with よい (good) and the literary conjectural であろうか. CG (computer graphics) is a standard abbreviation.