OpenGL flip or mirror the drawing object -

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how can flip, ot mirror up/left of image object, not screen in ondraw method?

i tried scale(1, -1, 1) not worked

my code:

 opengl.selectvertex(vertexname)                                 .translate(x-1, y, -9);                                  if (opengl.getpathmodifier(vertexname).getangle()>-180 &&                                      opengl.getpathmodifier(vertexname).getangle()<0 ) {                                     opengl.selectvertex(vertexname).scale(-scale,scale,1);                                   } else {                                     opengl.selectvertex(vertexname).scale(scale,scale,1);                                 }  opengl.rotate(opengl.getpathmodifier(vertexname).getangle()+90, 0, 0, 1);

not 100% sure you're asking here, think want transform projection matrix. if want flip things on left appear on right need scale projection matrix (-1, 1, 1). if want things @ top appear @ bottom need scale (1,-1, 1) , if want both can scale (-1, -1, 1).

edit based on information: if want display object same, texture flipped, need change texture coordinates of vertices in objects - flip texture coordinates replacing old u texture coordinate 1-u.


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