# are oblique projections one specific subdivision of trimetric projections?

So I've reaserched a while and come with this broad definitions

a projection is the representation of a 3D object in 2D by the use of "imaginary proyectors"(cameras of some sort).

it has 2 branches,

-perspective proyections : they focus on "focal points" of the drawings, and the general rule that distant objects are smaller than closer objects.

-parallel proyections: they focus on showing the images by "beam lines" that are parallel each other.

Inside parallel proyections are 2 subdivisions

--orthographic: they represent the object by frontal images of the object

--axonometric: focus in distorting the angle of the axes for the figure representation. it's broken in 2 kinds orthogonal and oblique

---orthogonal axonometry focus in the forshortening of the angles of the drawing system, it sub-divides in 3 parts

----isometric: it makes 3 angles equal ($120^\circ$ each)

----dimetric: it makes 2 angles equal

----trimetric: the 3 angles are different

---oblique axonometry focus also in the forshorthening of the angles, but with the limitation that one of them is always $90^\circ$

so by this definition is it logical to conclude that oblique axonometry is a special form of the trimetric axonometry?

If any of this definition is wrong , or could be expressed better, please tell me, also biblographical references would also be appreciated. thanks!

(also sorry for if I am not understood, English is my second language)

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