Point material at the shared graph of its configuration, building it on
first use, and register leaves as the values its draws forward.
leaves is held by reference: a later in-place leaf swap (a fresh
texture() node assigned into the same record) is picked up by the next
draw, but a swap that changes a leaf's SIGNATURE or the key must call this
again (the wrappers do, from rebuildGraph).
Point
materialat the shared graph of its configuration, building it on first use, and registerleavesas the values its draws forward.leavesis held by reference: a later in-place leaf swap (a freshtexture()node assigned into the same record) is picked up by the next draw, but a swap that changes a leaf's SIGNATURE or the key must call this again (the wrappers do, fromrebuildGraph).