Allow bounding sphere hints for objects and export such from Blender

[libs/gl.git] / blender / io_mspgl / export_object.py

diff --git a/blender/io_mspgl/export_object.py b/blender/io_mspgl/export_object.py
index b910add12fad3ed86ef397861de92fc8bb6a50b9..b911ed362bb242bc84f7f040a7ac25b90ac3e99a 100644 (file)
--- a/blender/io_mspgl/export_object.py
+++ b/blender/io_mspgl/export_object.py
@@ -1,4 +1,5 @@
 import os
+import mathutils
 
 def linear_to_srgb(l):
        if l<0.0031308:
@@ -48,6 +49,18 @@ class ObjectExporter:
                from .outfile import open_output
                out_file = open_output(out_file)
 
+               p1 = max(((v.co, v.co.length) for v in obj.data.vertices), key=lambda x:x[1])[0]
+               p2 = max(((v.co, (v.co-p1).length) for v in obj.data.vertices), key=lambda x:x[1])[0]
+               center = (p1+p2)/2
+               radius = (p1-p2).length/2
+               for v in obj.data.vertices:
+                       d = v.co-center
+                       if d.length>radius:
+                               center += d*(1-radius/d.length)/2
+                               radius = (radius+d.length)/2
+
+               out_file.write("bounding_sphere_hint", center[0], center[1], center[2], radius)
+
                prev_mesh = None
                prev_tech = (None, None)
                for i, l in enumerate(lods):