How cn i fix this " 3d REAL-TIME PREVIEW"

[ZeGraph]

Hi,
How can I solve this problem when I activate " Switch to Real-Time Preview"
The pixels in the object




Please, Help Me 🙂

[lambiloon]

Hi make a resolution to 300 dpi and check for it...regards

[ZeGraph]

Hi sir, thank you for your attention. I did what you told me, but this was the result