Class AxisAlignment

implot3d.cpp:2611–2614

                ImPlot3DPoint neg_y_axis = plot.RotationAnimationEnd * ImPlot3DPoint(0.0f, -1.0f, 0.0f);

                struct AxisAlignment {
                    ImPlot3DPoint axis;
                    float dot;
                };

                AxisAlignment candidates[] = {
                    {x_axis, (float)x_axis.Dot(up)},