FR: 3d Curve Width with CurveXYZ

[LionUCS]

It would be really nice if we could use a CurveXYZ or Multiple Curves to have an interpolating width curve depending on what angle the camera is viewing the polyline curve

[Firepal]

We could have a single Curve defining the width for the 360° angle range, it's more efficient than doing a dot-product on a CurveXYZ.

This is easy to implement as a custom material anyway.

[LionUCS]

I couldn't figure it out. I'm' a bit lost on how the include works.

[Firepal]

Don't think too hard about what's in the include file, everything should happen in a new shader in the vertex() function. The line_*.tres shaders can be used as reference. I should really have a minimum basic shader, used to have one in the 3.x version...

I would make this shader if I was in the mindset for it.

The include system is a bit special and esoteric compared to other ways of doing shaders, but it abstracts away the complexity of line-drawing (line_process() requires 9 arguments while quick_line() requires 3), and makes the line-drawing code only concern that include file. And if one day I figure out how to do screen-space lines, that will be very simple to implement for all shaders that use polyliner_inc, simply by implementing it in that file.