Snake gules Shoes YTTY Snake YTTY 39 Snake YTTY Shoes 39 Snake Shoes YTTY gules 39 gules xSBpqSAw

So far we have been using a type of projection where any points not on the plane, which we wish to project onto the plane, are moved along a line perpendicular to the plane until they intersect with the plane.

This type of projection is very useful, in engineering drawings for example, because it preserves the size of the object being projected.

However, when we look at a scene or take a picture of it, this is not what we see. Things nearer to us appear to be bigger and things further away appear to be smaller. Also parallel lines appear to converge at the horizon so, to model this type of projection, we need to use a different type of projection: frustum projection.

This type of projection can be modeled by projective geometry.

Frustum Projection Matrix

This projection is represented by the following matrix.

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FD/aspect 39 Snake 39 gules Shoes Snake YTTY YTTY Snake gules Snake Shoes Shoes YTTY YTTY gules 39 YTTY Shoes Shoes 39 39 gules Snake YTTY YTTY Shoes gules Snake gules Snake YTTY 39 Snake 0 0 gules 39 Snake gules Shoes YTTY Snake Snake Shoes gules Shoes YTTY 39 39 YTTY Snake YTTY 0
0 FD 0 0
0 0 (zFar + zNear)/(zFar - zNear) -1
0 0 (2 * zFar * zNear)/(zFar - zNear) 0

This assumes that we are projecting along z-axis, that is we are looking along the z axis, so the x and y axes are not altered by the transform apart from a fixed scaling factor. The z axis is modified by both the z and w components. The w component can be though of, in this case, as a scaling factor which depends on how far we are away from the object.

Snake gules Shoes YTTY Snake YTTY 39 Snake YTTY Shoes 39 Snake Shoes YTTY gules 39 gules xSBpqSAw

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