Context
Sprite3d (added in #1513) renders a centered quad. For 2.5D characters (Paper Mario-style), you almost always want the sprite's feet on the ground, which currently means manually offsetting pos.y by half the height.
Proposal
Add an anchor / origin option so the pivot can be placed at the bottom-center (feet), e.g. originPoint: { x: 0.5, y: 1 } or a simple anchor: "bottom" shorthand, applied as a constant offset baked into the local quad (so it composes with billboarding/flip and doesn't affect the cull bounds).
- Default stays centered (no behavior change).
- Should work across all billboard modes and with trimmed/rotated atlas frames.
Acceptance
new Sprite3d(x, y, { ..., originPoint: { x: 0.5, y: 1 } }) plants the bottom edge at pos.- Unit test: corner Y offsets shift by the origin; billboard projection still upright.
Refs: docs note in 2.5D Games ("Ground anchoring" caveat).
Context
Sprite3d(added in #1513) renders a centered quad. For 2.5D characters (Paper Mario-style), you almost always want the sprite's feet on the ground, which currently means manually offsettingpos.yby half the height.Proposal
Add an anchor / origin option so the pivot can be placed at the bottom-center (feet), e.g.
originPoint: { x: 0.5, y: 1 }or a simpleanchor: "bottom"shorthand, applied as a constant offset baked into the local quad (so it composes with billboarding/flip and doesn't affect the cull bounds).Acceptance
new Sprite3d(x, y, { ..., originPoint: { x: 0.5, y: 1 } })plants the bottom edge atpos.Refs: docs note in 2.5D Games ("Ground anchoring" caveat).