diff --git a/qglengine/core/glprimitives.cpp b/qglengine/core/glprimitives.cpp
index 4bdfb55..4b1ea63 100644
--- a/qglengine/core/glprimitives.cpp
+++ b/qglengine/core/glprimitives.cpp
@@ -264,10 +264,10 @@ Mesh * Primitive::cylinder(int segments, float radius, float height, float end_a
 
 
 Mesh * Primitive::arrow(int segments, float thick, float angle) {
-	double cone_r = 2. * thick;
+	double cone_r = 1.5 * thick;
 	double cone_h = 1.5 * cone_r / tan(angle * deg2rad);
 	Mesh * ret = new Mesh();
-	Mesh * m = Primitive::cylinder(segments, thick, 1. - cone_h);
+	Mesh * m = Primitive::cylinder(segments, thick / 2., 1. - cone_h);
 	ret->append(m);
 	delete m;
 	m = Primitive::cone(segments, cone_r, cone_h);
diff --git a/qglengine/renderer_service.cpp b/qglengine/renderer_service.cpp
index 40b089c..40b0ab3 100644
--- a/qglengine/renderer_service.cpp
+++ b/qglengine/renderer_service.cpp
@@ -56,8 +56,8 @@ RendererService::RendererService(Renderer * r_): r(r_) {
 	size_vp_scale = size_full_scale = 1.;
 	box_mesh   = Primitive::cube(0.8, 0.8, 0.8);
 	box_mesh_f = Primitive::cubeFrame(0.8, 0.8, 0.8);
-	omni_mesh   = Primitive::ellipsoid(2, 1);
-	omni_mesh_f = Primitive::ellipsoidFrame(2, 1);
+	omni_mesh   = Primitive::ellipsoid(2, 1, 0.5);
+	omni_mesh_f = Primitive::ellipsoidFrame(2, 1, 0.5);
 	omni_mesh  ->scalePoints(1.5);
 	omni_mesh_f->scalePoints(1.5);
 	cone_mesh   = Primitive::cone(8, 0.5, 1.);