debugLines method
Every body (and joint, when joints) as lines, seven floats each:
x1 y1 z1 x2 y2 z2, then a colour (0xAARRGGBB) stored in the float's
bits (read it with ByteData.view(lines.buffer).getUint32(…, Endian.host)).
Null when the backend cannot draw (Jolt outside its dev flavour).
Implementation
@override
Float32List? debugLines({bool joints = false}) => null;