From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 10 Dec 2014 18:34:41 +0000 (+0200)
Subject: Allow bounding sphere hints for objects and export such from Blender
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=84269f7b598673b06757313d70934a1747045b69

Allow bounding sphere hints for objects and export such from Blender
---

diff --git a/blender/io_mspgl/export_object.py b/blender/io_mspgl/export_object.py
index b910add1..b911ed36 100644
--- 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):
diff --git a/source/object.cpp b/source/object.cpp
index fe1690d2..28389450 100644
--- a/source/object.cpp
+++ b/source/object.cpp
@@ -68,7 +68,7 @@ void Object::update_bounding_sphere()
 	vector<Vector3> points;
 	for(vector<LevelOfDetail>::const_iterator i=lods.begin(); i!=lods.end(); ++i)
 	{
-		if(!i->mesh)
+		if(!i->mesh || !i->mesh->is_loaded())
 			continue;
 
 		const VertexArray &vertices = i->mesh->get_vertices();
@@ -92,6 +92,11 @@ void Object::update_bounding_sphere()
 		}
 	}
 
+	/* Don't touch the bounding sphere if we had no vertices to avoid
+	overwriting a possible hint. */
+	if(points.empty())
+		return;
+
 	bounding_sphere = Geometry::BoundingSphere<float, 3>::from_point_cloud(points.begin(), points.end());
 }
 
@@ -195,6 +200,7 @@ Object::Loader::Loader(Object &o, Collection &c):
 
 void Object::Loader::init()
 {
+	add("bounding_sphere_hint", &Loader::bounding_sphere_hint);
 	add("level_of_detail", &Loader::level_of_detail);
 }
 
@@ -203,6 +209,11 @@ void Object::Loader::finish()
 	obj.update_bounding_sphere();
 }
 
+void Object::Loader::bounding_sphere_hint(float x, float y, float z, float r)
+{
+	obj.bounding_sphere = Geometry::BoundingSphere<float, 3>(Vector3(x, y, z), r);
+}
+
 void Object::Loader::level_of_detail(unsigned i)
 {
 	LodLoader ldr(obj, i, coll);
diff --git a/source/object.h b/source/object.h
index 192cf069..a11bfd9b 100644
--- a/source/object.h
+++ b/source/object.h
@@ -59,6 +59,7 @@ public:
 		void init();
 		virtual void finish();
 
+		void bounding_sphere_hint(float, float, float, float);
 		void level_of_detail(unsigned);
 	};