From 5533f703fb6e2f5c1eb42734b763185e89a8f324 Mon Sep 17 00:00:00 2001
From: Mikhail Rachinskiy <mikhail.rachinskiy@gmail.com>
Date: Fri, 31 Dec 2021 12:26:59 +0400
Subject: [PATCH] PLY: Fix export faces with more than 255 sides
Ideally we want to use uint16 or uint32 data type for this purpose,
but certain DCCs have hardcoded uint8 limits in their PLY importers.
Silently tringulating faces with many sides is bad, but it's even worse
when correctly exported model won't load because of poor importer
implementation in other DCCs.
---
io_mesh_ply/export_ply.py | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/io_mesh_ply/export_ply.py b/io_mesh_ply/export_ply.py
index 060b3d02e..e86f43f3b 100644
--- a/io_mesh_ply/export_ply.py
+++ b/io_mesh_ply/export_ply.py
@@ -244,6 +244,10 @@ def save(
bm.from_mesh(me)
ob_eval.to_mesh_clear()
+ # Workaround for hardcoded unsigned char limit in other DCCs PLY importers
+ if (ngons := [f for f in bm.faces if len(f.verts) > 255]):
+ bmesh.ops.triangulate(bm, faces=ngons)
+
mesh = bpy.data.meshes.new("TMP PLY EXPORT")
bm.to_mesh(mesh)
bm.free()
--
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