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As the comment says, the cast of the matrix only works if both opengl and qt use the same floating point type.
Maybe you can just change the line
glMultMatrixd(static_cast<GLdouble*>( (*cloud_matrices)[i].data() ));//works as long as qreal and GLdouble are typedefs to double (might depend on hardware)
to
glMultMatrixf(static_cast<GLfloat*>( (*cloud_matrices)[i].data() ));//works as long as qreal and GLfloat are typedefs to float (depends on hardware)
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