Posted by Ususuus on Aug 14, 2017; 2:49pm
URL: https://forum.jogamp.org/My-Obj-is-deforming-while-rotating-tp4038111p4038131.html


below comments come from chapter 3 of the RED book, it surely answered my question. So i guess my problem is quite normal or reasonable...

The other type of projection is orthographic, which maps objects directly onto the screen without affecting their relative size. Orthographic projection is used in architectural and computer-aided design applications where the final image needs to reflect the measurements of objects rather than how they might look. Architects create perspective drawings to show how particular buildings or interior spaces look when viewed from various vantage points; the need for orthographic projection arises when blueprint plans or elevations are generated, which are used in the construction of buildings. (See "Projection Transformations" for a discussion of ways to specify both kinds of projection transformations.)