fix(conversions): re-center mesh/polyhedron geometry so TransformControls attaches at the visual center - #33
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…rols attaches at the visual center mesh.vertices/polyhedron.vertices arrive as absolute world coordinates and get written into the BufferGeometry as-is, so the returned THREE.Mesh's own .position stayed at the world origin no matter where the mesh actually sits. That's invisible for rendering (the geometry itself is already in the right place), but it broke anything reading .position/matrixWorld instead of the geometry - notably TransformControls.attach, which planted the transform gizmo at the world origin instead of the mesh's visual center. Adds centerGeometry(), used by both meshToThreeJS and polyhedronToThreeJS: translates the geometry by -center and sets mesh.position to that center, keeping every rendered vertex at the same world position while giving the object an origin a gizmo (or anything else keyed off object position) finds where the mesh actually is. Adds tests/datastructures.test.ts, covering both conversions. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This was referenced Sep 23, 2026
ericgozzi
added this pull request to stack #34
September 23, 2026 06:27
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Summary
mesh.vertices/polyhedron.verticesarrive as absolute world coordinates and were written into the BufferGeometry unchanged, so the resultingTHREE.Meshalways had its.positionat the world origin. That renders correctly, but anything that reads.position/matrixWorldbreaks. In particular,TransformControls.attachput the gizmo at the world origin instead of at the mesh.centerGeometry(), used by bothmeshToThreeJSandpolyhedronToThreeJS, moves the geometry by-centerand setsmesh.position = center. Every vertex stays at the same world position, and the object's origin is now at its visual center.Stacked on #32; merge that first. Backend counterpart: compas-dev/compas_threejs#59 (scale-mode
object_transformpivot fix).Test plan
tests/datastructures.test.ts(both conversions)🤖 Generated with Claude Code