Figure out the vertices of the quads. Find the quads with any vertices within the world radius and draw those as pixels within my canvas with rectangles one pixel wide and tall. These are placeholders in my canvas. Each quad has four vertices with x and y coordinates within or on the radius and some z coordinate at zero or some distance above or below zero.

Something weird, something wonderful.

Who are the PCs and what are they doing?

When and where does everything happen?

How and why did the PCs get in trouble?

Pixels! Draw all the quads with any vertices within the radius of the world map. Any quad vertex outside the radius needs to be normalized to the radius, with a z coordinate of zero. All vertices within the radius get moved above or below a z coordinate of zero. I need to draw two hemispheres, one above and one below..

space

Pick a point and generate the planet, mass first.

Oops!

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again

Pick a point and generate the planet, mass first.

Oops!

The 13th has passed...

stuff

Pick a point and generate the planet, mass first.

Oops!