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Asked: 2026-06-11T13:57:44+00:00

I’m rotating with model in Android’s OpenGL. Why those two examples below don’t produce

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I’m rotating with model in Android’s OpenGL.

Why those two examples below don’t produce same results? I thought, there is no difference, when I rotate about axis x and then y or y and then x.

gl.glRotatef(_angleY, 0f, 1f, 0f); //ROLL
gl.glRotatef(_angleX, 1f, 0f, 0f); //ELEVATION
gl.glRotatef(_angleZ, 0f, 0f, 1f); //AZIMUTH


gl.glRotatef(_angleX, 1f, 0f, 0f); //ELEVATION
gl.glRotatef(_angleY, 0f, 1f, 0f); //ROLL
gl.glRotatef(_angleZ, 0f, 0f, 1f); //AZIMUTH
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1 Answer

  1. Editorial Team

    Unless those rotations are all applied simultaneously, I would think order definitely would matter.

    If I had a cube and I rotated it around the x axis and moved the front face to the top, after rotating around the y axis, the original front face would still be on the top.

    If instead I first rotated around the y axis then the original front face would be moved aside so when I then rotated around the x axis the original front face would NOT be rotated to the top.

    I believe that order of rotation does matter.

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