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Computer Graphics

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    $\begingroup$ The range of numbers on the axes change between the three diagrams, and the 2nd and 3rd have more vertices labelled. Are these transformed versions of the same cube, or three separate shapes? $\endgroup$ Commented Feb 10, 2016 at 3:43
  • $\begingroup$ There is information about syntax highlighting on Meta Stack Exchange but it appears that Matlab is not supported. $\endgroup$ Commented Feb 10, 2016 at 3:54
  • $\begingroup$ The first shape is an example of one of the composite worldspace shapes in its local coordinates with normals drawn on. The middel and right hand plots is the same worldspace shape transformed $\endgroup$ Commented Feb 10, 2016 at 11:38
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    $\begingroup$ Just FYI, in a GPU, the back face culling is done (or can be considered to be done) on the post-projection values of the vertices, and thus only needs to consider the X&Y values of the 3 triangle vertices. (There are a few reasons for this: avoiding problems with floating point rounding being one) $\endgroup$ Commented Feb 10, 2016 at 11:53