Fix Earth shadow on scaled Moon during eclipse

The unprojected position passed to the shader should be the actual
physical position without the fake scaling effect, so that the shadow
gets properly computed.

src/core/modules/Planet.cpp

@@ -2557,11 +2557,15 @@ void Planet::drawSphere(StelPainter* painter, float screenSz, bool drawOnlyRing)
 
 	// Generates the vertice
 	Planet3DModel model;
-	sSphere(&model, radius*sphereScale, oneMinusOblateness, nb_facet, nb_facet);
+	sSphere(&model, radius, oneMinusOblateness, nb_facet, nb_facet);
 
 	QVector<float> projectedVertexArr(model.vertexArr.size());
 	for (int i=0;i<model.vertexArr.size()/3;++i)
-		painter->getProjector()->project(*((Vec3f*)(model.vertexArr.constData()+i*3)), *((Vec3f*)(projectedVertexArr.data()+i*3)));
+	{
+		Vec3f p = *((Vec3f*)(model.vertexArr.constData()+i*3));
+		p *= sphereScale;
+		painter->getProjector()->project(p, *((Vec3f*)(projectedVertexArr.data()+i*3)));
+	}
 
 	const SolarSystem* ssm = GETSTELMODULE(SolarSystem);
 
@@ -2774,7 +2778,7 @@ void Planet::drawSurvey(StelCore* core, StelPainter* painter)
 			v = verts[i];
 			painter->getProjector()->project(v, v);
 			projectedVertsArray[i] = Vec3f(v[0], v[1], v[2]);
-			v = Mat4d::scaling(radius * sphereScale) * verts[i];
+			v = Mat4d::scaling(radius) * verts[i];
 			v = Mat4d::scaling(Vec3d(1, 1, oneMinusOblateness)) * v;
 			// Undo the rotation we applied for the survey fix.
 			v = Mat4d::zrotation(M_PI / 2.0) * v;