Discussion - proposal to extend !TEXMAP specification

[Roland Melkert]

I'm a little ignorant on this side of things. What projection info is needed that's different for LDraw code than the three methods we have now for PNG?

The projection the texture meta mentions is about how to map the image to the target polygons.
The projection I mentioned is about how the LDRaw geometry is 'projected' onto the texture image itself.
PNG's don't have that step as they're already image data.

Should be determined by current screen resolution/viewbox, although this could be governed by render quality user settings in the tool.

Zoom level details is usually done through mip mapping, the resolution I mentioned is about how big the 'master' image will be internally.
Looking at some official texture for mini-fig faces (which are actual quit low res) 10pix/ldu seems like a decent starting point.

How is the size determined currently for png? Is there a need to add the scalability option?

Don't know, like mentioned above the ones for minifig faces seem very low res to me.