Your primitives 3D model may appear hard (unsmooth or jagged) on a tablet due to low polygon count, insufficient anti-aliasing, or limited device GPU performance.
Low polygon counts make primitive edges sharp (e.g., a low-poly sphere looks faceted), anti-aliasing (which smooths jagged edges) is often disabled on tablets to save power, and tablets’ less powerful GPUs struggle with rendering smooth 3D shapes compared to desktops.
Try increasing the primitive’s polygon count in your 3D tool, enabling anti-aliasing in the app/engine settings (if available), or reducing other graphics effects (like high-res textures) to help the tablet render smoother edges.