java - old JOGL, order of transformation -


i have solve problem , realize bit oldschool code..

i need write down order of transformations 1 4 , result pruple vertex. me check whether correct , if not - why?

jogl code

it bit tough me find answers , 100% sure correct.

what think correct: 1. start bottom, take modelview first, projection - yet not sure did right...

edit, code rewritten text:

gl.glmatrixmode(gl.gl_modelview); gl.glloadidentity(); gl.glmatrixmode(gl.gl_projection); gl.glloadidentity(); gl.glmatrixmode(gl.gl_modelview); gl.gltranslatef(-1, -1, -0); gl.glmatrixmode(gl.gl_projection); gl.glscalef(2, 1, 3); gl.glrotatef(-90, 0, 0, 1); gl.glmatrixmode(gl.gl_modelview); gl.glscalef(2, 3, 1);   gl.glbegin(gl.gl_quads); gl.glcolor3f(0, 0, 1); gl.glvertex3f(-2, -2, -2); gl.glcolor3f(1, 1, 0); gl.glvertex3f(2, 1, 3); gl.glcolor3f(1, 0, 1); gl.glvertex3f(1, 1, -2); gl.glcolor3f(0, 1, 0); gl.glvertex3f(-1, 1, 2); gl.glend();

write transformations go in order , write coordinate changes of purple vertex each transformation.

transform 1:________________ coordinates x:_______ y:_______ z: _______

transform 2:________________ coordinates x:_______ y:_______ z: _______

transform 3:________________ coordinates x:_______ y:_______ z: _______

transform 4:________________ coordinates x:_______ y:_______ z: _______

problem solved

  • supposed start model transforms , projection, bottom
  • apply transforms bottom

also, accidentally using wrong coordinates..

~thanks though!


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