Enables overmap on SC, adds Sif to SC skybox (#6954)

* Enables overmap on SC, adds wip Sif to SC skybox

* codersprites

code/modules/overmap/overmap_planet.dm

@@ -0,0 +1,98 @@
+/obj/effect/overmap/visitable/planet
+	name = "planet"
+	icon_state = "globe"
+	in_space = 0
+
+	var/datum/gas_mixture/atmosphere
+
+	var/atmosphere_color = "FFFFFF"
+	var/mountain_color = "#735555"
+	var/surface_color = "#304A35"
+	var/water_color = "#436499"
+	var/has_rings = FALSE // set to true to get rings
+	var/icecaps = null // Iconstate in icons/skybox/planet.dmi for the planet's icecaps
+	var/ice_color = "E6F2F6"
+	var/ring_color
+	var/skybox_offset_x = 0
+	var/skybox_offset_y = 0
+
+/obj/effect/overmap/visitable/planet/Initialize()
+	. = ..()
+
+/obj/effect/overmap/visitable/planet/get_skybox_representation()
+	var/image/skybox_image = image('icons/skybox/planet.dmi', "")
+
+	skybox_image.overlays += get_base_image()
+
+//	for(var/datum/exoplanet_theme/theme in themes)
+//		skybox_image.overlays += theme.get_planet_image_extra()
+
+	if(mountain_color)
+		var/image/mountains = image('icons/skybox/planet.dmi', "mountains")
+		mountains.color = mountain_color
+		mountains.appearance_flags = PIXEL_SCALE
+		skybox_image.overlays += mountains
+
+	if(water_color)
+		var/image/water = image('icons/skybox/planet.dmi', "water")
+		water.color = water_color
+		water.appearance_flags = PIXEL_SCALE
+//		water.transform = water.transform.Turn(rand(0,360))
+		skybox_image.overlays += water
+
+	if(icecaps)
+		var/image/ice = image('icons/skybox/planet.dmi', icecaps)
+		ice.color = ice_color
+		ice.appearance_flags = PIXEL_SCALE
+		skybox_image.overlays += ice
+
+	if(atmosphere && atmosphere.return_pressure() > SOUND_MINIMUM_PRESSURE)
+
+		var/atmo_color = get_atmosphere_color()
+		if(!atmo_color)
+			atmo_color = COLOR_WHITE
+
+		var/image/clouds = image('icons/skybox/planet.dmi', "weak_clouds")
+
+		if(water_color)
+			clouds.overlays += image('icons/skybox/planet.dmi', "clouds")
+
+		clouds.color = atmo_color
+		skybox_image.overlays += clouds
+
+		var/image/atmo = image('icons/skybox/planet.dmi', "atmoring")
+		skybox_image.underlays += atmo
+
+	var/image/shadow = image('icons/skybox/planet.dmi', "shadow")
+	shadow.blend_mode = BLEND_MULTIPLY
+	skybox_image.overlays += shadow
+
+	var/image/light = image('icons/skybox/planet.dmi', "lightrim")
+	skybox_image.overlays += light
+
+	if(has_rings)
+		var/image/rings = image('icons/skybox/planet_rings.dmi')
+		rings.icon_state = pick("sparse", "dense")
+		if(!ring_color)
+			rings.color = pick("#f0fcff", "#dcc4ad", "#d1dcad", "#adb8dc")
+		else
+			rings.color = ring_color
+		rings.pixel_x = -128
+		rings.pixel_y = -128
+		skybox_image.overlays += rings
+
+	skybox_image.pixel_x = rand(0,64)    + skybox_offset_x
+	skybox_image.pixel_y = rand(128,256) + skybox_offset_y
+	skybox_image.appearance_flags = RESET_COLOR
+	return skybox_image
+
+/obj/effect/overmap/visitable/planet/proc/get_base_image()
+	var/image/base = image('icons/skybox/planet.dmi', "base")
+	base.color = get_surface_color()
+	return base
+
+/obj/effect/overmap/visitable/planet/proc/get_surface_color()
+	return surface_color
+
+/obj/effect/overmap/visitable/planet/proc/get_atmosphere_color()
+	return atmosphere_color

code/modules/overmap/sectors.dm

@@ -6,7 +6,7 @@
 	scannable = TRUE
 	scanner_desc = "!! No Data Available !!"
 
-	var/list/map_z = list()
+	var/list/map_z = null
 	var/list/extra_z_levels //if you need to manually insist that these z-levels are part of this sector, for things like edge-of-map step trigger transitions rather than multi-z complexes
 
 	var/list/initial_generic_waypoints //store landmark_tag of landmarks that should be added to the actual lists below on init.
@@ -31,7 +31,8 @@
 	if(. == INITIALIZE_HINT_QDEL)
 		return
 
-	find_z_levels()     // This populates map_z and assigns z levels to the ship.
+	if(!map_z)			// If map_z is already defined, we don't need to find where we are
+		find_z_levels() // This populates map_z and assigns z levels to the ship.
 	register_z_levels() // This makes external calls to update global z level information.
 
 	if(!global.using_map.overmap_z)