an abstraction of a flat surface whose orientation is defined by eight loudspeakers of a D-8 sound projection system, forming a front border (running from Front Left through Front Center to Front Right), a back border (running from Back Left through Back Center to Back Right), a left side border(running from Front Left through Side Left to Back Left) and a right side border (running from Front Right through Side Right to Back Right). Perceived sound sources can be described as having a location in this plane or outside its borders. The purpose of this plane is to describe the perceived motion that takes place within the three dimensional space. Although this motion may be in some way three dimensional, only two dimensions can be controlled by D-8 sound projection and are therefore the only two discussed.
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I am assuming that you are in a three dimensional world. Then the three planes of projection would be the xy plane, the xz plane, and the yz plane.
In a first angle projection, the object stands in between the observer and the plane of projection. In a third angle project, the object and the plane of projection is interchanged.
it is physically the projection or shadow of a line on a plane...
the answer is... -OBLIQUE -ISOMETRIC -PERSPECTIVE OR -DIAMETRIC
The answer depends on where a plane cuts through the cylinder. It could be a circle, ellipse, rectangle or square. Not sure what the projection on a plane at an angle to the length of the cylinder would be. A parabola? Plus there are other section where the