Real-time lighting + solar system rendering

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

@@ -0,0 +1,10 @@
+package mindustry.graphics.g3d;
+
+import arc.graphics.*;
+import arc.math.geom.*;
+
+/** Defines color and height for a planet mesh. */
+public interface HexMesher{
+    float getHeight(Vec3 position);
+    Color getColor(Vec3 position);
+}