68664cb · blender-bridge

blender-bridge commits / 68664cb

fix: transform import — wrong origin positions and basis sign errors

- Origin was read from positions 12,14,13 (old row-3 layout) but
  export now puts it at 3,11,7 (column-3 layout). This caused all
  positions to reset to (0,0,0).
- b[2][2] had wrong sign (-data[5] instead of data[5])
- b[1][2] had wrong sign (data[6] instead of -data[6])
- full_import no longer checks direction flag, so reconnects work

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

68664cbd65354b1aea3c6d24a9d07c72c9e25c70

by plankatron <fleeky@gmail.com> · 2026-03-03T00:45:02.000Z

Changed files (2) +10 -8

blender_addon/scene_import.py +0 -2

…	…	@@ -50,8 +50,6 @@ class SceneImporter:
50	50
51	51	if header["magic"] != b"BGOD":
52	52	raise ValueError(f"Bad magic: {header['magic']}")
53		if header["direction"] != 0:
54		return # Not a godot→blender export
55	53
56	54	self._last_sequence = header["sequence"]
57	55

src/blender_bridge.cpp +10 -6

…	…	@@ -455,26 +455,30 @@ void BlenderBridge::import_changes(Node *root) {
455	455	memcpy(xform_data, base + entry.data_offset, TRANSFORM_SIZE);
456	456
457	457	// Convert Blender Z-up back to Godot Y-up
	458	// Reverse of _export_transform (translation in column 3: positions 3,7,11)
458	459	Transform3D xform;
459	460	Basis &b = xform.basis;
460	461	Vector3 &o = xform.origin;
461	462
462		// Reverse of _export_transform
	463	// Export: out[0]=b00, out[1]=-b20, out[2]=b10
463	464	b[0][0] = xform_data[0];
464	465	b[1][0] = xform_data[2];
465	466	b[2][0] = -xform_data[1];
466	467
	468	// Export: out[4]=-b02, out[5]=b22, out[6]=-b12
467	469	b[0][2] = -xform_data[4];
468		b[1][2] = xform_data[6];
469		b[2][2] = -xform_data[5];
	470	b[1][2] = -xform_data[6];
	471	b[2][2] = xform_data[5];
470	472
	473	// Export: out[8]=b01, out[9]=-b21, out[10]=b11
471	474	b[0][1] = xform_data[8];
472	475	b[1][1] = xform_data[10];
473	476	b[2][1] = -xform_data[9];
474	477
475		o.x = xform_data[12];
476		o.y = xform_data[14];
477		o.z = -xform_data[13];
	478	// Export: out[3]=o.x, out[7]=-o.z, out[11]=o.y
	479	o.x = xform_data[3];
	480	o.y = xform_data[11];
	481	o.z = -xform_data[7];
478	482
479	483	target->set_global_transform(xform);
480	484	}