Real-time lighting + solar system rendering

core/src/mindustry/graphics/g3d/HexMesh.java

@@ -0,0 +1,18 @@
+package mindustry.graphics.g3d;
+
+import arc.math.geom.*;
+import mindustry.graphics.*;
+import mindustry.type.*;
+
+public class HexMesh extends PlanetMesh{
+
+    public HexMesh(Planet planet, int divisions){
+        super(planet, MeshBuilder.buildHex(planet.generator, divisions, false, planet.radius, 0.2f), Shaders.planet);
+    }
+
+    @Override
+    public void preRender(){
+        Shaders.planet.lightDir.set(planet.solarSystem.position).sub(planet.position).rotate(Vec3.Y, planet.getRotation()).nor();
+        Shaders.planet.ambientColor.set(planet.solarSystem.lightColor);
+    }
+}