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What does Ortho mean exactly?

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I''m pretty sure Ortho is short for Orthogonal and so you''d have like an Orthographic Rendering Engine if you made an engine with an Ortho view. But what exactly does it mean?

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I think the word has it''s roots in greek. There are other greek words containing "ortho". Like Orthographia (not sure about the spelling) which i think is what you study in school when learning how to spell correctly.

I know, crappy reply but what the heck

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Othogonal is just a way of viewing a 3D scene. It''s basically looking into the scene without any perspective. Simply the orthogonal view point just drops the Z part of a 3D posistion and then uses the X and Y parts to put the point on the screen.

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The mighty Oxford English Dictionary bestrides the English language like a colossal dictionary with legs. It has this to say on the subject:

[a. F. orthogonal, f. orthogone: see prec. and -al1; and cf. hexagonal, etc.]
1. Having or of the nature of a right angle, right-angled (obs.); pertaining to or involving right angles; at right angles to something else, or to each other; rectangular.
orthogonal projection, projection in which the rays are at right angles to the plane of projection. orthogonal trajectory, a curve intersecting each of a family of curves at right angles.

2. Math. a. Of a linear transformation: preserving lengths and angles; leaving unchanged quantities of the form x1^2 + x2^2 +…+ xn^2 and the inner product of any two vectors.

b. Applied to the group of all orthogonal matrices of a given order.

c. Of a square matrix: representing an orthogonal transformation; such that the rows (and likewise the columns) are orthonormal when considered as vectors; equal to the inverse of its transpose; (these three properties are equivalent).

d. Of two vectors or functions: perpendicular; having an inner product equal to zero. Of a set of vectors or functions: such that the inner product of any two is zero if and only if the two are distinct.

3. Statistics. Of a set of variates: statistically independent. Of an experimental design: such that the variates under investigation can be treated as statistically independent.

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brendon@phi:~$ dict ortho
1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Ortho- \Or"tho-\ ([^o]r"th[-o]-) pref. [Gr. ''orqo`s straight;
akin to Skr. [=u]rdhva upright, v[.r]dh to grow, to cause to
[1913 Webster]
1. A combining form signifying straight, right, upright,
correct, regular; as, orthodromy, orthodiagonal, orthodox,
[1913 Webster]

2. (Chem.) A combining form (also used adjectively),
(a) (Inorganic Chem.) The one of several acids of the same
element (as the phosphoric acids), which actually
occurs with the greatest number of hydroxyl groups;
as, orthophosphoric acid. Cf. {Normal}.
(b) (Organic Chem.) Connection with, or affinity to, one
variety of isomerism, characteristic of the benzene
compounds; -- contrasted with {meta-} or {para-}; as,
the ortho position; hence, designating any substance
showing such isomerism; as, an ortho compound.
[1913 Webster]

Note: In the graphic representation of the benzene nucleus
(see {Benzene nucleus}, under {Benzene}), provisionally
adopted, any substance exhibiting double substitution
in adjacent and contiguous carbon atoms, as 1 & 2, 3 &
4, 4 & 5, etc., is designated by ortho-; as,
orthoxylene; any substance exhibiting substitution of
two carbon atoms with one intervening, as 1 & 3, 2 & 4,
3 & 5, 4 & 6, etc., by meta-; as, resorcin or
metaxylene; any substance exhibiting substitution in
opposite parts, as 1 & 4, 2 & 5, 3 & 6, by para-; as,
hydroquinone or paraxylene.
[1913 Webster]

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