Let me get this straight

:

**Linear projection** are

**orthographic** projections. Only, in the

**Ninja Gaiden** screen, we're dealing with an oblique projection which is a

**linear projection** but not an

**orthographic** projection. Am I right so far?

dpixel's edit would be

**oblique projection**:

While my original screen would be...

**orthographic projection**?:

Orthographic projections are generally very simple : the angle of a line in the 2d projection always has the exact same relation to the angle the viewer is looking at. For example, all planes that are exactly perpendicular to the angle the viewer's eyes are pointing, are always completely invisible (dpixel's pipe edit demonstrates this principle); all planes that exactly face the angle the viewer's eyes are pointing, are completely visible (unless other objects obscure them directly) and unskewed. The same principle of a given angle appearing the same no matter where it is in the viewport, applies universally.

Ok, I think this is the definition I was looking for. I've saved both pictures to my hardrive by the way.

So this perspective:

...is equivalent to this one:

While this one:

...is equivalent to this one:

So basically, I have to choose either an oblique or orthographic projection and then stick with it, am I getting this right?

But more importantly, hopefully, it gives a clear visual on what faces will always be visible, and what faces will never be visible, relative to any given camera angle.

Well, it does give me an idea as to what faces will always be visible if I compare both pictures. It's just the angle of those faces I need to determine based on the model of projection I end up choosing.

Here's the thing:

More specifically, I want to add toilet rolls to the stage. I need to determine how to draw the top of the toilet roll.

Correct me if I'm wrong here:

This would be orthographic:

My question is: based on my screen, just how much of the top should I see? What's the eye level here? Should the top ellipse be the same as the one in the cone here:

Anyways, thanks for taking so much time for a thorough input!