camera position

OpenGL OpenGL: Basic Coding
1

hello.
I’m working on a webgl project.
I have this function

 
CalcMatrix: function () {
        this.LoadPerspectiveMatrix();
        //alert(this.m_left + "_" + this.m_right + "_" + this.m_bottom + "_" + this.m_top + "_" + this.m_zNear + "_" + this.m_zFar);
        this.m_MVmatrix = mat4.ortho(this.m_left, this.m_right, this.m_bottom, this.m_top, this.m_zNear, this.m_zFar);

         mat4.multiply(this.m_MVmatrix, this.m_CurrentRotationMatrix);

        //        mat4.multiply(this.GetWorldMatrix(), this.GetViewMatrix(), this.m_MVmatrix);

        this.m_InvMatrix = mat3.create();
        mat4.toInverseMat3(this.m_MVmatrix, this.m_InvMatrix);
        mat3.transpose(this.m_InvMatrix);
        this.m_render.UpdateFromCamera(this);
    }

that i using to calculate the matrixes
this:


       this.m_InvMatrix = mat3.create();
       mat4.toInverseMat3(this.m_MVmatrix, this.m_InvMatrix);
        mat3.transpose(this.m_InvMatrix);

returns the inverse view matrix.
is possible to get the camera position from it?

thanks.