<Dd> P v = (1 0 0 0 1 0 0 0 0) (v x v y v z) = (v x v y 0) (\ displaystyle Pv = (\ begin (bmatrix) 1&0&0 \ \ 0&1&0 \ \ 0&0&0 \ \ \ end (bmatrix)) (\ begin (bmatrix) v_ (x) \ \ v_ (y) \ \ v_ (z) \ end (bmatrix)) = (\ begin (bmatrix) v_ (x) \ \ v_ (y) \ \ 0 \ end (bmatrix))) </Dd> <P> Often, it is more useful to use homogeneous coordinates . The transformation above can be represented for homogeneous coordinates as </P> <Dl> <Dd> P = (1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1) (\ displaystyle P = (\ begin (bmatrix) 1&0&0&0 \ \ 0&1&0&0 \ \ 0&0&0&0 \ \ 0&0&0&1 \ end (bmatrix))) </Dd> </Dl> <Dd> P = (1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1) (\ displaystyle P = (\ begin (bmatrix) 1&0&0&0 \ \ 0&1&0&0 \ \ 0&0&0&0 \ \ 0&0&0&1 \ end (bmatrix))) </Dd>

What is the most important view in an orthographic drawing