From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 15 Jul 2023 19:33:32 +0000 (+0300)
Subject: Correctly export cameras aligned on the Z axis
X-Git-Url: https://git.tdb.fi/?a=commitdiff_plain;h=0f82f24126911d024c235e94127812a9c50edad2;p=libs%2Fgl.git

Correctly export cameras aligned on the Z axis
---

diff --git a/blender/io_mspgl/export_camera.py b/blender/io_mspgl/export_camera.py
index 7108681a..9b814d9e 100644
--- a/blender/io_mspgl/export_camera.py
+++ b/blender/io_mspgl/export_camera.py
@@ -16,8 +16,13 @@ class CameraExporter:
 		resource.statements.append(Statement("look_direction", look_dir.x, look_dir.y, look_dir.z))
 
 		right_dir = obj.matrix_world@mathutils.Vector((1, 0, 0, 0))
-		look_xy = mathutils.Vector((look_dir.x, look_dir.y, 0))
-		up_dir = right_dir.xyz.cross(look_xy)
+		if look_dir.x*look_dir.x+look_dir.y*look_dir.y>0.01:
+			look_flat = mathutils.Vector((look_dir.x, look_dir.y, 0))
+		elif abs(look_dir.y)>abs(look_dir.x):
+			look_flat = mathutils.Vector((look_dir.x, 0, look_dir.z))
+		else:
+			look_flat = mathutils.Vector((0, look_dir.y, look_dir.z))
+		up_dir = right_dir.xyz.cross(look_flat)
 		resource.statements.append(Statement("up_direction", up_dir.x, up_dir.y, up_dir.z))
 
 		# Auto seems to be the same as horizontal