osg 矩阵相关

下面结果是一样的 

    osg::Matrix mtrixx;
    mtrixx.makeRotate(90 / 180.f * osg::PI, osg::Vec3(1, 0, 0));

    osg::Matrix mtrixx12 = osg::Matrix::rotate(90 / 180.f * osg::PI, 1, 0, 0);

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下面结果是一样

    osg::Matrix m1;
    m1.makeTranslate(osg::Vec3(18, 12,3));

    osg::Matrix m2= osg::Matrix::translate(osg::Vec3(18, 12, 3));

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下面结果是一样

    osg::Matrix mtrixxttt;
    mtrixxttt.makeScale(osg::Vec3(2, 3,3));

    osg::Matrix mtrixxppp = osg::Matrix::scale(osg::Vec3(2, 3, 3));

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 下面两段代码是一样的，旋转90移动15，然后再转90然后再移动15

    osg::Matrix mtrixx;
    mtrixx.makeRotate(90 / 180.f * osg::PI, osg::Vec3(0, 1, 0));
    tr->setMatrix(mtrixx * tr->getMatrix());
    mtrixx.makeTranslate(osg::Vec3(15, 0, 0));
    tr->setMatrix(mtrixx * tr->getMatrix());
    mtrixx.makeRotate(90 / 180.f * osg::PI, osg::Vec3(0, 1, 0));
    tr->setMatrix(mtrixx * tr->getMatrix());
    mtrixx.makeTranslate(osg::Vec3(15, 0, 0));
    tr->setMatrix(mtrixx * tr->getMatrix());

    osg::Matrix mtrixx;
    tr->setMatrix(osg::Matrix::rotate(90 / 180.f * osg::PI, 0, 1, 0) * tr->getMatrix());
    tr->setMatrix(osg::Matrix::translate(osg::Vec3(15, 0, 0)) * tr->getMatrix());
    tr->setMatrix(osg::Matrix::rotate(90 / 180.f * osg::PI, 0, 1, 0) * tr->getMatrix());
    tr->setMatrix(osg::Matrix::translate(osg::Vec3(15, 0, 0)) * tr->getMatrix());

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牛的局部坐标是这样的 

原文地址：https://blog.csdn.net/qq_15267341/article/details/142703607

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