... LinGSECTION 1.6 Modeling vs. Rendering Revisited 171.6 Modeling vs. Rendering RevisitedThis chapter began by asserting that OpenGL is primarily concerned with rendering, not modeling. The interactivity ... a different modeling transform to correctly position it. This is done, object byobject, by setting the transform then drawing the corresponding objects. To animate anobject, its modeling transformation ... both a viewing transform and a modeling transform, it must be updated when either transform needs to be changed. The mod-elview matrix is created by multiplying the modeling transform (M) by the...