( They ( ( are ( formed ( as ( ( light ( from ( a ( light source ) ) ) ) ( is ( ( ( ( reflected or ) transmitted ) ( via ( ( ( one or ) more ) ( specular surfaces ) ) ) ) ( before ( hitting ( a ( diffuse surface ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (VP (VBN formed) (SBAR (IN as) (S (NP (NP (NN light)) (PP (IN from) (NP (DT a) (JJ light) (NN source)))) (VP (VBZ is) (VP (VBN reflected) (CC or) (VBN transmitted) (PP (IN via) (NP (QP (CD one) (CC or) (JJR more)) (NN specular) (NNS surfaces))) (PP (IN before) (S (VP (VBG hitting) (NP (DT a) (JJ diffuse) (NN surface))))))))))) (. .)))
They are formed as light from a light source is reflected or transmitted via one or more specular surfaces before hitting a diffuse surface.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN light)) (VP (VBZ reflects) (PP (IN from) (NP (DT a) (JJ rough) (NN surface)))))) (, ,) (NP (PRP it)) (VP (VBZ gets) (ADJP (JJ diffused))) (. .)))