Trained on 461 matcaps at 768x768px on sd1.5.

https://imgur.com/nBGargE

You'll likely need to crop the matcap as the sphere won't reach the edge of the canvas on most seeds.

Some good positive prompts:

sphere, smooth, full circle, perfect circle, globe, perfect orb, vivid colors, gradient, simple

Some good negative prompts:

straight line, film grain, pizza, quadrants, right angle

I hope you find this LoRA useful!