osg 矩阵相关

news2024/11/26 2:38:25

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);

备注： rotate或makerotate第一个参数是弧度，可以用弧度值=osg::inDegrees(角度值) 得到弧度值，也可以用公式：角度值 / 180.f * osg::PI 来计算弧度值

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));

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));

之所以一样是因为下面，

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());