O3DVisualizer material settings: how can I see the red ball in a transparent cubic from all the view (angles)?

Hello,

O3DVisualizer material settings: how can I see the red ball in a transparent cubic from all the view (angles)? In some view angle the ball cannot be seen.

Here is the transparent cubic material setting
mat->base_color = { 119.0f / 255.0f, 119.0f / 255.0f, 119.0f / 255.0f, 0.3f };
mat->point_size = 3.0;
mat->base_metallic = 0.f;
mat->base_roughness = 1.f;
mat->base_reflectance = 0.10f;
mat->base_clearcoat = 1.f;
mat->base_clearcoat_roughness = 1.f;
mat->base_anisotropy = 0.0f;
mat->thickness = .5f;
mat->transmission = .5f;
mat->absorption_color = { 0.5f, 0.5f, 0.5f };
mat->absorption_distance = .5f;
mat->shader = “defaultLitTransparency”;
mat->name = “glass”;