Decrease the default number of rings in CylinderMesh to 0

[Calinou]

Follow-up to #49729.

Subdividing a CylinderMesh is only needed when deforming it in a shader. The new default rings value decreases the triangle count for a CylinderMesh by a factor of 5.

The property hint was also tweaked to allow setting the number of rings to 0, which is a valid value.

Preview

Before

After

[akien-mga]

I'm not really competent in that field so just asking to have it discussed: can it cause issues with some algorithms to have such thin elongated tris in the 0 rings version?

[reduz]

I think @BastiaanOlij should give a check to this

[clayjohn]

I don't think this change is an improvement.

• The difference in vertex count is negligible (GPUs are made to render thousands at a time, and there is no speed benefit unless you are reducing vertex count by many thousand). The only platform where the reduced vertex count may be beneficial is mobile, but this is bad for mobile for other reasons (below).

• Long thin triangles can lead to worse performance (especially on mobile, but even on desktop)

• Long thin triangles will look horrible with vertex lighting