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biXen

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  1. Like
    biXen reacted to leplubodeslapin for an article, Source Lighting Technical Analysis: Part Two   
    This is the second part of a technical analysis about Source Lighting, if you haven’t read the first part yet, you can find it here. 
    Last time, we studied the lightmaps, how they are baked and how VRAD handles the light travel through space. We ended the part 1 with an explanation of what the Constant-Linear-Quadratic Falloff system is, with a website that allows you to play with these variables and see how lighting falloff reacts to them. We will now continue with basic examples of things you can do with these variables. 
     
    Examples of application
    Constant falloff
    The simplest type of falloff is the 100% constant one. Whatever the distance is, the lighting has theoretically the same intensity. This is the kind of (non-)falloff used for the sun lighting, it is so far away from the map area, that light rays are supposed to be parallel and light keep its intensity. Constant falloff is also useful for fake lights, lights with a very low brightness but that are here to brighten up the area.
     
     

     
    Linear falloff

    Another type of falloff is the 100% linear one. With this configuration, light seems to be a bit artificial: it loses its intensity but goes way further than the 100% quadratic falloff. It can be very useful on spots, the lighting is smooth and powerful. Here is an example:
     

     
    Quadratic falloff

    This is the default configuration for any light entity in Hammer, following as we said before the classic Inverse-Square law (100% Quadratic Falloff). It is considered to be the most natural and realistic falloff configuration. The biggest issue is that it boosts the brightness so much on short distances, that you can easily obtain a big white spot. Here is an example, with a light distant of 16 units from a grey wall:

     
    This can also happen with linear falloff but it is worse with quadratic. Simple solutions exist for that, the most common is not to use a light entity but a light_spot entity that is oriented to the opposite direction from the wall/ceiling the light is fixed to. You can make the opening angle of your light_spot wider, with the inner and outer angle parameters (by default the outer one is 45°, increase that to a value of 85° for example). If needed, you can also add a light with low brightness to light the ceiling/wall a bit.

     
    50% & 0% FallOff
    A second light falloff system exists, overriding the constant-linear-quadratic system if used. The concept is much simpler, you have to configure only 2 distances:
    50 percent falloff distance: Distance at which light should fall off to 50% from its original intensity 0 percent fall off distance: Distance at which light should end. Well ... almost, it actually fall off to 1/256% from its original intensity, which is negligible. The good thing with this falloff system is that you can see the 2 spheres according to the 2 distances you have configured in Hammer. Just make sure to have this option activated: 

     
    Models lighting
    An appropriate section for models lighting is needed, because it differs from brush lighting (but the falloff stays the same). In any current game engine, lightmaps can be used on models, a specific UV unwrap is even made specifically for lightmaps. But on Source Engine 1 (except for Team Fortress 2) you cannot use lightmaps on models. 
    The standard lighting method for models is named Per-Vertex Lighting. This time, light won’t be lighting faces but vertices, all of the model’s vertices. For each one of them, VRAD will compute a color and brightness to apply. Finally, Source Engine will make a gradient between the vertices, for each triangle. For example:

    If we take a simple example of a sphere mesh with 2 different light entities next to it, we can see it working.
                
    With this lighting method, models will therefore be integrated in the environment with an appropriate lighting. The good thing is that, if a part of the model is in a dark area, and another part is in a bright area, the situation will be handled properly. The only requirement for this is that the mesh must have a sufficient level of detail in it; if there is a big plane area without additional vertices on it, the lighting details could be insufficient. 
    Here is an example of a simple square mesh with few triangles on the left and a lot on the right. With the complex mesh, the lighting is better, but more expensive. 

    If you need a complex mesh for your lighting, you don’t want your model to be too expensive, you have to find a balance. 
    Two VRAD commands are needed to make the Per-Vertex Lighting work:
    StaticPropLighting StaticPropPolys You have to add them here. You can find more information here.
    Another system exists, that is much cheaper and simpler. Instead of focusing on the lighting of all the vertices, the engine will only deal with the model’s origin. The result obtained in-game will be displayed on the whole model, using only what has been computed at the model’s origin location. This can be an issue if the model is big or supposed to be present in an area with lots of contrast in lighting. The best example for that is at the beginning of Half-Life 2 with trains entering and exiting tunnels. We can see the issue: the model is illuminated at the beginning, but when it enters the tunnel it suddenly turns dark. And this moment is when the train’s origin gets in the shadow. 
    This cheap lighting method will replace the per-vertex lighting for 3 types of models:
    For prop_dynamic or any kind of dynamic models used in the game (NPCs, weapon models in hand, any animated models...) For prop_physics For ANY MODEL USING A NORMAL MAP (vertex lighting causes issues with normal maps apparently), EVEN IF USED AS A PROP_STATIC
    The big problem with these models is their integration in the map, they won’t show any shadow and their lighting will be very flat and boring (because it’s the same used for the whole model). But hopefully there are 2 good things with this cheap lighting method. 
    First, the orientation from which comes light is taken into account, if blue light comes from one direction, therefore all the faces oriented toward this direction will be colored in blue. And if you have different lighting colorations/intensities coming from different sides of your model, they should appear in game. 
    Here is an example of a train model using a normal map with 2 lights on both side. If you look closely, you’ll see some blue lighting on the left, on faces that are supposed to be in the shadow of the blue light but are oriented toward the blue light.
     

     
    The second good thing is that there is still some kind of dynamic per-vertex lighting, but much simpler: it only works with light and light_spot entities (NOT with light_environment), and it just adds some light to the prop, it cannot cast any shadow (it only takes into account dynamically the distance between the light and the vertex). If we use again the high-poly plane mesh we had before as a prop_dynamic, being parented to a func_rotating that ... rotates. Light is dynamically lighting the vertices of the props. There is a limit of 3 dynamic lights per prop, it can’t handle more at the same time.

    And if you add a normal-map in your model’s texture, this cheap dynamic lighting works on it:

     
    Projected texture and Cascaded Shadows
    Few words to finish the study with dynamic lighting. Projected textures is a technology that appeared with Half-Life 2: Episode Two in 2007, it consists of a point-entity projecting a texture in the chosen direction, with a chosen opening angle (fov). The texture is projected with emissive properties (it can only increase the brightness, not lowering it) and it can generate shadows or not. The great thing with this technology is that it’s fully dynamic, the env_projectedtexture can move and/or aim at moving targets. This technology is used for example on flashlights in Source games. But as usual, there is also a drawback: most of the time you can only use only 1 projected texture at a time, modders can change this value quite easily but on Valve games it is always locked on 1. 

    The cascaded shadows system is only used on CS:GO. The concept is quite similar from a projected texture but it doesn’t increase the brightness, it only adds finer shadows. It is used for environment lighting, using much smaller luxels than for the lightmaps and it is fully dynamic. It starts from the tools/toolsskybox textures of the map and cast shadows if it meets any obstacle. Shadows from the lightmap are most of the time low resolution and the transition between a bright and a dark area is blurry and wide. Therefore, the cascaded shadow will be able to draw a clear shadow around the one from the lightmaps.

    When an object is too small to get a shadow in the lightmap, it will be visible thanks to the cascaded shadows. There are 3 levels of detail for cascaded shadows on Counter-Strike, you can configure the max distance at which the cascaded shadows will work in the env_cascade_light entity at the parameter Max Shadow Distance (by default it’s 400 units). The levels of detail will be distributed within this range, for example: 

    Since cascaded shadows and projected textures share some technology, you can’t use them both at the same time.
     
    Conclusion
    I really hope you have found this article interesting and learned at least few things from it. I believe most of these informations are not the easiest to find and it’s always good to know how your tools work, to understand their behavior. Source Engine 1 is old and its technologies might not be used anymore in the future, more powerful and credible technologies are released frequently but it’s always good to know your classics, right? 
    I would like to thank Thrik and ’RZL for supporting me to write this article, and long live the Core!
    // Written by Sylvain "Leplubodeslapin" Menguy
    Additional commands for fun
    Mat_luxels 1                              // Allows you to see the lightmaps grids Mat_fullbright 1                         // Disables all the lighting (= fullbright). On CS:GO, cascaded shadows stay and you should delete them as well (cf next command) Ent_fire env_cascade_light kill  // KILL WITH FIRE the cascade shadows entity Mat_drawgray 1                        // Replace all the textures with a monochrome grey texture, useful to work on your lighting  Mat_fullbright 2                         // Alternative to Mat_drawgray 1 Bonus:
    Mat_showlowresimage 1           // Minecraft mode
  2. Like
    biXen reacted to will2k for an article, Source FPS Cost of Cheap and Expensive Assets   
    A new question?
    After successfully solving the eternal mystery of func_detail vs. displacement in my last article (here), I was contacted by the High Council of Source Engine Optimization. Apparently, there seems to be another enigma to be uncovered and a major question to be answered.
    What is the fps cost of cheap and expensive assets in Source engine? Is there a significant difference between the two in terms of frame rate? (that’s 2 questions but I’ll let this one slide)
    The study
    As with the last article, this one is also going to be a short but sweet article; fewer words, more numbers and screenshots. The systematic approach is also going to be very similar: 2 similar test maps where one contains expensive assets while the other has cheap versions of these assets. The assets will be the same and will be located in the same locations in both test maps.
    The recent assets added with the new de_nuke update in CSGO will be the perfect candidates for our study as Valve made most of these in cheap and expensive versions. For props, the expensive version is high-poly models while the cheap one is low-poly. For textures, the expensive version gets a normal map (up to 2), specular map, advanced reflections, detail map, and Phong shading in some cases; the cheap version is basically the diffuse map with the occasional detail map.
    I will record the localized fps in both versions and compare, then draw conclusions that will hopefully answer the High Council’s question(s).
    The testbeds
    The first map to test is the one made of cheap assets. It’s basically a simple map consisting of 4 walls and a floor on which are spread several props and textured blocks at predetermined locations. Textures are mostly concrete while props contain crates, cars, pipes, wires, doors, and vents.

    The fps recorded is 330 fps. The expensive version is exactly the same but with props replaced with their high poly versions and textures swapped with their expensive versions.

    The fps is now 286 fps; interesting. All right, let me call the High Council to relay the news.
    Hold your horses right there. We are men of Science and you know that…yes, yes, I know, one map is not enough to draw conclusions.
    I’m going to take this map and quadruple it, in area and in content, and test again (Nobel prize here I come). The new map will have 4 times the amount of props and textured brushes (the same ones of the initial map cloned into the new areas) as well as having its total area increased fourfold. We start with the cheap version that we will refer to as test map (4x).

    The fps decreased to 279 (from the 330 in the simple cheap map) due to the extra content that the engine has to render. Our main point of concern would still be to compare this version against the expensive one.
    You know the drill by now; we will also create the (4x) expensive version.

    The fps is 229. The decrease in (4x) version is more or less in line with the one in the simple version. Let’s recap in a table for easier viewing.

    As you can see, the fps dropped 44 fps in the simple version and 50 fps in the 4x version, between the cheap and expensive maps respectively.
    We can draw 2 conclusions from the above table:
    There is a significant drop between the cheap and expensive version (44/50fps), and there is also a substantial drop within the same version (51/57fps) when you add much more content that is all visible in the PVS.
    These results can shed some light on the latest update of de_nuke where the overall fps is lower than the rest of the stock maps in CSGO. The high amount of props/details that can be seen/rendered from one location coupled with the expensive assets in the playable area contribute to further decrease in the overall fps in that map (in addition to the open skybox/layout). I have tackled a revised optimization system for de_nuke in a topic of mine last month that can be read here (https://www.mapcore.org/topic/19909-de_nuke-a-revised-optimization-system/)
    As a bonus, I’ll throw in the compile times of the above maps so you can witness the effect of cheap vs. expensive, and the additional content in (4x) versions, on the compile time, especially on vrad since it will mostly be affected by the extra faces in the high poly models and the additional vmt switches in the expensive materials.

    You can clearly see that vrad times increased considerably between the cheap and the expensive versions, as well as within the same version when we quadrupled the area/content.
    Now if you’ll excuse me, I still have a phone call to make; the grand council woman cannot wait any longer.
    The final cost
    Expensive assets bring visual eye candy to the map in hand which is a necessity in today’s ever-growing and continuously pushed graphics boundaries. Relying on low poly models and cheap textures won’t fare well on the visual fidelity front. However, expensive assets come at a cost of taxing the rendering engine and decreasing the overall fps in the map.
    These expensive assets are a requisite if you want your map to shine (pun intended) but one has to be careful not to overuse them. Use them wisely in the playable area and resort to cheap versions when decorating the non-playable areas of the map or any place that the player cannot see up close to discern the difference.
     
  3. Like
    biXen reacted to will2k for an article, Viability of Hostage Rescue Scenario in CS:GO   
    This level design article is about the past and the present of the hostage rescue mode in Counter-Strike. Showcasing the inherent issues that accompanied the scenario allowing the bomb/defuse mode to gain traction and popularity. This article will also present what can be done, level design wise, to remedy some of the shortfalls and allow the scenario to be viable.
    A historical background
    Counter-Strike officially started life in June 1999 with the release of beta 1, and it shipped with four maps, that’s right, four whole maps. They were all hostage rescue maps and the prefix used for these maps was cs_ as opposed to the standard deathmatch maps starting with dm_. This prefix was an abbreviation of the game’s name (Counter-Strike) which hints to this hostage-rescue scenario being the only one in the minds of Gooseman and Cliffe, the creators of CS, at the time of launch.
    Fast forward a couple of months, beta 4 rolled out in November 1999 bringing to the table a new scenario, bomb defuse. The new maps carried the prefix de_ and while one would think that the hostage rescue maps would be switched to hr_ prefix, they kept the same prefix which started to be referred to as the “Classic Scenario”. Counter-Strike was built on hostage rescue scenario.
    I started playing CS in beta 2 in August 1999 (I totally missed beta 1, screw me) and maps like Assault and Siege were all the rage at LAN parties. The nearest LAN/internet café was a 5-minute drive from my place, and LAN parties with friends used to be a blast full of shouting, cursing, bluffing, noob-trashing; the standard menu for a CS session. Good times.
    Siege, the oldest CS map (beta 1), and Assault (beta 1.1) were the epitome of the game. You had to dive in as a CT deep into the T stronghold to rescue the hostages and bring them back to safety. These maps were the most played on LANs and embodied the style of early CS gameplay. At the LAN place where I used to wage my virtual battles, Assault equaled CS, literally. A fun fact is that when Dust came out, I started a LAN session with this map and everyone in the room shouted at me: "What the hell is this? We wanna play CS!" For my friends, Assault was CS.
    However, those rosy days for hostage rescue began to turn into grim grey when folks started playing bomb defuse scenario and realized how…fun it was. A map like Dust almost single-handedly pushed the scenario into higher ground with its bright environment/textures, clear/wide paths and its ease of use and noob-friendliness. A year later, around Summer 2000, Counter-Strike was now equivalent to Dust for my friends.
    How did this happen? What went wrong?
    Inherent flaws of hostage rescue
    Hostage rescue is a very delicate and tough scenario for law enforcement operators in the real world. It puts the assailing team at a great disadvantage against heavily-armed barricaded hostage-takers who are probably using civilian hostages as human shields and as a bargaining chip for a later escape.
    As you can deduce, transferring this scenario as realistically as possible into the game will not fare well, and this disadvantage will carry on for the CT team. The problem is only exacerbated when you add the more or less “flawed” game mechanics to the scenario. This is exactly what went wrong with hostage rescue scenario in case you are still wondering about the rhetoric questions at the end of the historical background introduction. The popularity of cs_ scenario started dwindling and the rise of the bomb/defuse scenario only made things worse.
    Almost all the early cs_ maps featured a relatively tiny hostage zone/room having one entryway usually sealed with closed doors that the CT must open to get access inside. This room was typically located behind T spawn which made the area a camping ground and made camping that zone an obvious and rewarding tactic for Ts. The doors having to be manually opened with a loudening sound made things worse and negated any surprise or sneaky rush towards the hostages. A classic example is the hostage area and T spawn in cs_assault.

    I dare not think of how many Ts are camping behind those doors
    Another equally important camp fest occurred in the hostage rescue zone. Early designs made the rescue zone relatively small with one or two access paths that can be defended from one location. If the CT team manages to reach the hostages and rescue them, the Ts could easily fall back to the rescue zone to camp and patiently wait for the CTs to show up. The hostage rescue zone in cs_italy is a nice example to showcase how one T could camp in the southernmost spot in the zone allowing him to monitor both entryways, from market and from wine cellar, within the same field of view. CT slaughter was almost a guaranteed thing to happen.

    A CT will show up any second now; imminent slaughter commencing in ...3, 2, 1
    A third flaw was the hostages themselves. They were difficult to escort and protect and were easily stuck or left behind in various parts of the maps between their initial hostage zone and the final rescue zone. I lost count of how many times I rescued the hostages and ran as fast as I could to the rescue zone, reaching it with a big grin on my face only to turn around and find out that only one or two of the four hostages actually followed me; the others were randomly stuck on a ladder, door frame, window ledge, vent, chair, table…I could go on but my blood is starting to boil just thinking of this.
    To add insult to injury, hostages could also be killed or “stolen” for ultimate trolling. When Ts were stacked on money, they could easily kill all the hostages, basically turning the round to a frustrating terrorist hunt for CTs. In early CS versions, a CT teammate could press the “use” key on a hostage that you were already escorting to steal it. This would leave you helplessly wondering where the hell did the 4th hostage go in case you did not catch the teammate performing the action.
    Lastly, maps themselves contributed to the issues that were piling up against hostage rescue scenario. If you are a CS veteran and you were around the early betas in 1999, you would most certainly remember how quickly hostage rescue maps were pruned from one beta to another; some maps even had a life span of 1 week before being discarded out of the official roster. Most of these early cs maps featured dark, nightly environments that were unfriendly to both newcomers and established players. Other maps had a confusing-as-hell labyrinthine layout that confused even the most great-sense-of-direction players, and made remembering paths nigh impossible. Some of these maps had narrow twisted paths and choke points, vents, and ladders that not only frustrated players (especially CTs) but also made rescuing and escorting the hostages more of wishful thinking. The icing on the cake was the different gimmicks introduced in some maps that made a frustrating gameplay/layout even more annoying: some maps had a machine gun nest in T spawn allowing Ts to master and perfect the art of CT slaughtering while other maps had flammable drums that could be shot and blasted for the ultimate carnage right next to the hostage zone. Good example maps include cs_prison, cs_bunker, cs_iraq, cs_hideout, cs_facility, cs_desert, among many others.
    Meanwhile, bomb/defuse scenario was gaining grounds at an increased rate and before too long, hostage rescue was relegated to a distant second place in terms of popularity among players and level designers alike.
    As a small experiment, I tallied the number of custom hostage and defuse maps submitted on Gamebanana for Counter-Strike Source and Global Offensive. For CS:GO, there are 761 de_ maps against 157 hostage maps while for CS:S, the figures are 4060 de_ for 1244 cs_ maps. The disparity is rather meaningful as the ratio in CS:GO is 4.85:1 while for CS:S the number is 3.26:1. This means that for each hostage map in CS:GO there are almost five maps of bomb/defuse whereas this number drops slightly to almost three maps for CS:S. With CS:GO putting extra focus on competitive gameplay, this ratio is bound to further grow widening the rift between bomb/defuse and hostage rescue maps.
    That’s it? Is it done for cs_ maps? Shall we prepare the obituary or is there a magical solution to breathe some fire and life in them?
    Solutions for viability
    There is a magical solution that involves you transferring a large sum of cash to my bank account, then my “guys” will contact your “guys” to deliver the “solution”. The drop point will be at the…apparently, there has been a mix-up, this is for another “deal” …nervous chuckle.
    Seriously though, while there is no magical solution that will lift hostage rescue onto the rainbow, there are a couple of things that level designers can do to start injecting some momentum to the scenario. Luckily for us, Valve has already paved the way (so these “Volvo pls fix pls” do work after all?). In March 2013, Valve introduced a major CS:GO update that completely overhauled the hostage rescue scenario mechanics and introduced cs_militia as well. The update was a game changer and a much needed tweak towards a better hostage rescue gamemode.
    We now have two hostages instead of four, and the CTs only need to rescue one of them to win the round. Moreover, the hostage does not stupidly follow the CT but instead is carried on the CT’s shoulders. Obviously the movement speed of the CT carrying the hostage is decreased but this “inconvenience” is countered with added bonus round time and the fact that the CT doesn’t have to glance over his shoulders every five seconds to make sure the hostages are still following him (this kind of distraction can prove fatal to the CT escorting the hostages). The hostages’ spawn location is randomized and can be controlled by the level designer. A nice change is that hostages don’t die anymore thus cutting any chance of Ts trolling (you still lose money when you shoot a hostage – shooting a hostage is pretty pointless now akin to shooting yourself in the foot).
    This is all good news if you ask me; hostage rescue is on the right path to become popular and viable again. With Valve doing the first half of the change, level designers have the duty to continue with the second half.
    Hostage defuse?
    As a first suggested solution, let us start treating hostage rescue as bomb defuse. Let’s be honest, bomb defuse works really well, so why not transfer this “experience” into hostage rescue. What we can do is to have a hostage rescue map’s layout mimic one of bomb defuse – that is have two hostage zones that are similarly placed as two bomb sites. We need to start treating a hostage zone like a bomb site with all accompanying techniques of rushing, pushing, faking, peeking, holding, smoking, flashing, etc. The good thing about this is that whatever knowledge, skill, and layout awareness that players have acquired from defuse scenarios will transfer effortlessly to the hostage rescue scenario; you do not need to learn new tactics and strategies. The roles will be inversed: instead of Ts rushing bomb sites and CTs defending, CTs will push hostage zones and Ts will defend and rotate.  
    Sounds logical, right? Some people might argue that having 2 separate hostage zones is not “realistic” and my answer is Counter-Strike was never about realism (carrying and running around with a 7 kg (15.5 lb), 1.2 m (47.2 inch) AWP sniper rifle with 25x telescopic sight, quickscoping and headshotting opponents is the epitome of “realism”). If you want a realistic hostage rescue scenario, then you are better off playing the original Rainbow Six Rogue Spear and SWAT 3 from 1999, or the more recent ARMA and Insurgency for a realistic military setting. I practice what I preach and I already implemented this technique in my last map “cs_calm”. The map was a remake of my CS 1.5 map from 2003 and obviously I made the “mistake” at that time to follow the trend set by official maps of having one hostage zone right behind T spawn. A playtest on Reddit CS:GO servers back in March 2015 confirmed that this setup won’t work well as Ts will inevitably abuse the hostage zone.
    I made some radical layout changes towards T spawn and hostage zone and created two new hostage zones on the upper and lower levels of the map that are connected by a back hallway to allow quick rotations (in addition to the one through T spawn). Obviously, there is no direct line of sight between hostage zones to prevent 1-zone camping. Ts have absolutely no incentive to camp one zone as CTs can reach the other one, rescue the hostage and head back to the rescue zone without being spotted from the other zone. CTs actually have a chance of winning the round by rescuing the hostages.
    I like to believe the new layout worked well. Only time and more hostage rescue maps will tell.

    Layout of the map "cs_calm"
    Rescue zone anti-camping
    We have remedied the hostage zone camping but we still need to tend to the rescue zone camping issue. A solution to this is to have two rescue zones in a similar setup to what is nicely done in cs_office. While Ts can still camp one zone, they risk a big chance of having CTs reach the other rescue zone. Again, CTs will have a viable option to save the hostages without being shredded by camping Ts. If the layout does not allow or facilitate having two rescue zones, then one big rescue zone with multiple entrances (three is a good number) should work fine. The trick here is to have the entrances not easily covered within the same field of view to prevent camping.
    Into the zone
    Just as we established that we should treat hostage zones like bomb sites, it goes without saying that each hostage zone should have at least 2 to 3 entry points. It’s pretty pointless to have only one entrance as this totally defeats the purpose of spreading hostages into two zones. The different entryways should also not be covered within the same field of view of one T; if a T decides to camp the zone, then he should be able to cover two entrances from one point leaving the third one more or less at a dead angle and viable for a CT rush or stealth/sneak surprise. 

    Showcase of Hostage Zone A on the map "cs_calm"
    The above screenshot showcases “Hostage Zone A” in cs_calm. A terrorist will typically camp near the hostage covering the two encircled entrances. The third entrance from upper level denoted by the arrow is not in the direct FOV, and is prone to a surprise attack by CTs that could catch the camping T off guard. If possible, try to spread the entrances on different vertical levels to spice things up and keep Ts on their toes.
    Lastly, it is a good idea to have a connector between hostage zones to allow fast rotations but without having a direct line of sight between hostage zones. We want to make the scenario fairer to CTs but not at the expense of Ts, inadvertently making it unfair for them.
    Conclusion
    Hostage rescue is a fun scenario if you ask me. It had many inherited and added flaws that contributed to its waning but it’s nothing that can’t be reversed. We, as level designers, need to push some changes to put the scenario back on track. What I just showcased in this article might not be the only viable solutions but they certainly are a step in the right direction. Level designers are intimidated by players who shun away from cs_ maps, and this turns into a vicious circle where players avoid hostage rescue maps and mappers in return avoid designing them. We need to break this cycle and designers need to bravely embrace the solutions I presented here or come up with their own solutions. The more cs_ maps that come out and get tested, the more we could validate these solutions as viable.
    In either case, we need to get proactive towards hostage rescue scenario; after all, this is the cornerstone that Counter-Strike was built upon.
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