From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 5 Mar 2022 08:55:47 +0000 (+0200)
Subject: Fixes for exporting objects consisting only of lines
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=52dd0394da580cc18ad1463e1646d06ac12dac8a

Fixes for exporting objects consisting only of lines
---

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index fb568ec4..7a33778d 100644
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -181,7 +181,7 @@ class Mesh:
 		if mesh.use_uv=='NONE' or not mesh.uv_layers:
 			self.uv_layers = []
 		else:
-			self.uv_layers = [UvLayer(u) for u in mesh.uv_layers]
+			self.uv_layers = [UvLayer(u) for u in mesh.uv_layers if u.data]
 
 			# Assign texture unit numbers to UV layers that lack one
 			missing_unit = [u for u in self.uv_layers if u.unit is None]
@@ -193,7 +193,7 @@ class Mesh:
 
 			self.uv_layers = sorted(self.uv_layers, key=(lambda u: u.unit))
 
-			if mesh.use_uv=='UNIT0':
+			if mesh.use_uv=='UNIT0' and self.uv_layers:
 				self.uv_layers = [self.uv_layers[0]]
 				if self.uv_layers[0].unit!=0:
 					self.uv_layers = []
@@ -708,7 +708,8 @@ class Mesh:
 		# Keep track of the score and number of unused faces for each vertex
 		vertex_info = [[0, len(v.faces)] for v in self.vertices]
 		for vi in vertex_info:
-			vi[0] = valence_boost_scale*(vi[1]**valence_boost_power)
+			if vi[1]:
+				vi[0] = valence_boost_scale*(vi[1]**valence_boost_power)
 
 		face = None
 		reordered_faces = []
@@ -783,6 +784,11 @@ class Mesh:
 					v.index = len(reordered_vertices)
 					reordered_vertices.append(v)
 
+		for v in self.vertices:
+			if v.index<0:
+				v.index = len(reordered_vertices)
+				reordered_vertices.append(v)
+
 		self.vertices = reordered_vertices
 
 		for e in self.edges: