BasisCurves improvements

[hshakula]

New

• Support for curves of bezier basis
• Primitive support for catmullRom and spline bases by interpreting them as linear
• Support varying interpolation for widths
• Optimized a bit memory usage for linear curves - there is no need to allocate memory for dummy indices when there are no authored ones

Open Questions

• Should we consider converting (in the plugin) catmullRom and spline bases to bezier or the current behavior is sufficient?

[hshakula]

Here's an example of bspline curves that are interpreted as linear for RPR

Render from Karma

Curves asset is a carpet from Esper Room by Multiverse

[bsavery]

How do Catmull Rom curves work now?
IMO RPR itself should do the conversion from segments to curved scheme

[hshakula]

How do Catmull Rom curves work now?

Same as bspline - data interpreted as linear

IMO RPR itself should do the conversion from segments to curved scheme

Do you have examples?

[bsavery]

Meaning you should load a bunch of points into RPR and tell it how to interpolate the curves, linear, etc https://rmanwiki.pixar.com/display/REN23/Curves

[hshakula]

Well, that would be ideal, but for now, RPR curves can only be of bezier type. So even linear curves are not completely correct.

Correct me if I'm wrong

[bsavery]

No you're correct. I just am saying we should propose that to RPR SDK.