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FBX export / subdivision: Write proper boundary rule 

Currently when exporting a subdivision surface (//Geometry / Export Subdivision Surface// enabled) the exporter uses a hard-coded BoundaryRule rule of 2 (CreaseAll, meaning hard corners). The subdivision surface modifier has an option for boundary smoothing mode so this patch propagates that information to the FBX exporter.

Example .fbx file with  this feature exported from modified Blender 2.93: https://github.com/bqqbarbhg/ufbx/blob/overhaul/data/blender_293x_subsurf_boundary_7400_binary.fbx

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D12204
This commit is contained in:
Samuli Raivio 2021-09-29 17:58:50 +02:00 committed by Bastien Montagne
parent ea457d4ab5
commit 9a285d8016
3 changed files with 10 additions and 2 deletions
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2
io_scene_fbx/__init__.py
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@ -21,7 +21,7 @@
bl_info = {
"name": "FBX format",
"author": "Campbell Barton, Bastien Montagne, Jens Restemeier",
"version": (4, 24, 0),
"version": (4, 25, 0),
"blender": (2, 90, 0),
"location": "File > Import-Export",
"description": "FBX IO meshes, UV's, vertex colors, materials, textures, cameras, lamps and actions",

5
io_scene_fbx/export_fbx_bin.py
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@ -879,7 +879,10 @@ def fbx_data_mesh_elements(root, me_obj, scene_data, done_meshes):
if last_subsurf:
elem_data_single_int32(geom, b"Smoothness", 2) # Display control mesh and smoothed
elem_data_single_int32(geom, b"BoundaryRule", 2) # Round edges like Blender
if last_subsurf.boundary_smooth == "PRESERVE_CORNERS":
elem_data_single_int32(geom, b"BoundaryRule", 2) # CreaseAll
else:
elem_data_single_int32(geom, b"BoundaryRule", 1) # CreaseEdge
elem_data_single_int32(geom, b"PreviewDivisionLevels", last_subsurf.levels)
elem_data_single_int32(geom, b"RenderDivisionLevels", last_subsurf.render_levels)

5
io_scene_fbx/import_fbx.py
View File

@ -2928,6 +2928,11 @@ def load(operator, context, filepath="",
mod = parent.bl_obj.modifiers.new('subsurf', 'SUBSURF')
mod.levels = preview_levels
mod.render_levels = render_levels
boundary_rule = elem_prop_first(elem_find_first(fbx_sdata, b'BoundaryRule'), default=1)
if boundary_rule == 2:
mod.boundary_smooth = "PRESERVE_CORNERS"
else:
mod.boundary_smooth = "ALL"
_(); del _