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How to Create REALISTIC GRASS in Roblox — Transcript

by Ice Guy · 2,798 words · 391 segments · language en · Watch on YouTube

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0:00Grass can make your game feel alive,
0:02make it feel real. But Roblox's grass
0:04kind of sucks. But what if it didn't? In
0:06this video, I will be showing you how to
0:08make realistic grass and optimize it to
0:10fit any game. Let's begin.
0:13>> [music]
0:14>> Now, there's three main ways you can
0:16make grass. Let's start with the default
0:18Roblox grass [music] option. Okay,
0:20getting the default Roblox grass is
0:22pretty easy. Usually it's enabled
0:24already, but if it's not, you can go
0:25into this workspace tab, click on
0:27terrain, enable decoration.
0:30Now, if you don't see this, it's
0:32probably because the terrain material
0:35isn't grass. Now, if it's ground, leafy
0:38grass, stone, or anything, grass won't
0:41show up out of it. So, what you need to
0:42do is you need to make sure it's
0:44selected as grass right here. If you
0:46paint over [music] it, then you can see
0:47grass is showing. Now, there are a
0:49couple of settings you can change with
0:51this grass, such as the grass length.
0:53This simply just changes the length of
0:55the grass. If you increase it, it'll be
0:57taller. At the highest setting, it will
0:59be pretty much the size of a character,
1:01but if you decrease the size to its
1:03smallest amount, it won't be above the
1:04legs of the character. Now, increasing
1:06or decreasing this will change the
1:08density of the grass blades. The smaller
1:10them are compacted it'll be, the larger
1:13the less compacted it'll be. Now,
1:15another thing you can do with this is
1:16change the grass color. And you can do
1:18this by going into this material colors
1:20here, finding what says grass, then if
1:23you alter this color, it'll change the
1:25material and the grass color. So, if you
1:27want it to be blue for some reason or
1:28anything like that, you just change it.
1:30[music] And another thing you can do is
1:32change how the wind affects it. So, if
1:33you go into this tab, search up wind
1:35direction, you'll get this. The speed
1:38controls how fast the wind is flowing.
1:40The yaw changes the angle at which it
1:43flows, and the pitch changes if it's
1:46flowing upward or downward. And this
1:48wind feature is really the main benefit
1:50of using Roblox grass, cuz it's just
1:52really hard to replicate this kind of
1:54wind motion. Now, the next type of grass
1:56is 3D grass. In simple terms, this is
1:59just a high-fidelity modeled grass with
2:01each blade being an actual part. We'll
2:04be glossing over this because it tends
2:05[music] to be rather laggy.
2:08So, that leaves one option left, which
2:10is decal grass. And it's quite simple to
2:12make, actually. Okay, to begin, just
2:15open up a new Chrome tab, and then just
2:17search up grass image. Then, what you
2:20should be looking for is images that
2:22look like this, where it's grass in a
2:24transparent background. I would
2:26recommend getting four different images,
2:28all that are somewhat similar to each
2:30other, so we can use it for extra
2:32variation. Once you get your four
2:34images, go into a photo editing program.
2:36I'm using Photopea. It is free, so you
2:39should use it. I'm going to do new
2:41project and set the width and height to
2:44512. Then, what I'm going to do is I'm
2:47going to drag in the images I just
2:49saved. And when you're dragging in your
2:50images, make sure you scale your grass a
2:53little bit smaller. That way, it's not
2:55so close to the top of the texture. And
2:57make sure that this image is
2:59transparent. So, just drag in each of
3:01your grass images you saved. Now, if one
3:04of yours doesn't have a completely
3:06transparent background like this, what I
3:08usually do is I bring in a black
3:11rectangle, send it to the background,
3:13then I click on the image, then I click
3:15on this little search icon, then I type
3:17in alpha and select color to alpha, then
3:20I set this color right here to white,
3:22and I decrease this opacity threshold
3:25just until you start seeing little bits
3:27of white right here. So, I think 75
3:29works. Then, increase this transparency
3:31threshold a little bit, just so there's
3:32no nothing in the background. I'd say
3:35around 20% works. Then, you can just go
3:38back and tweak these a little bit more
3:39if you need. Then, when you're done with
3:41that, make sure the transparency works.
3:43Here, it's a little too transparent, so
3:44you can just go back here and tweak it a
3:46little bit more. And if there's adequate
3:48room next to the image, you can always
3:50scale it up a little bit. Then, once you
3:52have your four images all done and ready
3:54to go, you can just export them out from
3:57Photopea and just save it and then we'll
3:59go into Blender. If you wanted to spare
4:01some time and not go through this
4:02hassle, then you should join my Discord
4:04server and pick up some of my pre-made
4:06grass assets for free. And while I have
4:08your attention, if you found this video
4:10or one of my other tutorials helpful,
4:12then consider helping me reach my goal
4:14of 10,000 subscribers by the end of the
4:16year. Also, if you're on mobile, I think
4:17there's a high button that helps this
4:19video in the algorithm someway. So,
4:21maybe try that. Okay, back to the video.
4:22Now, once you're in Blender, you can
4:24press shift A to bring up this menu, go
4:26into mesh, add in a plane,
4:29rotate it 90°, then once you have this
4:32image here, go into the shading tab,
4:34then select new, do shift A, type in
4:37image, select an image texture, click on
4:40the open tab, then click on one of those
4:42grass assets you saved previously. It
4:45doesn't matter which one right now.
4:46Then, plug the color into color. If you
4:48really wanted to, you could plug the
4:50alpha into alpha, but you don't need to
4:51do that right now. Then, once you have
4:53this image, you can rotate it, you can
4:55duplicate it by pressing shift D, and
4:57just keep doing this to add some
5:00randomness to your grass clump. Now,
5:02this is a little bit too dense, so you
5:04can always just move it around. You can
5:06press A to view everything at once, that
5:09highlights everything. It just helps
5:10[music] viewing a little bit more. So,
5:12just spread this out a little bit, make
5:14it even. And once you have a grass clump
5:16that looks adequate, once you have
5:18something that looks good, what I
5:20recommend doing is selecting all these
5:22and selecting the top edge and just
5:25bringing it across slightly. This will
5:27add some more depth and won't make it
5:29look flat when viewing from above. So,
5:31just drag these randomly across, just
5:34fill it in a little bit. And then once
5:36you have something that looks like this,
5:37you're doing pretty good. Next, what you
5:39want to do is randomly scale these. So,
5:42just select random planes and size them
5:45a little bit differently. You don't want
5:47any really small cuz that'll just look
5:48weird and yeah. [music] So, just scale
5:50them randomly. And another tip you can
5:53do is go right up to here, select the
5:55snapping icon, and make sure it's
5:57selected on edge. Then, when you drag
5:59it, you can snap everything down to the
6:01same edge, so everything's even. Select
6:04all of them, then click on one of the
6:06center ones and do Ctrl J to join them
6:09as one model. And that's the main way
6:11you make decal grass. There are some
6:13other ways you can do it like these.
6:15This one simply follows the same
6:16procedure as the first one, but it
6:19simply has a couple more loop cuts to
6:21add some more depth. Now, the downside
6:22with using this is that it's a lot more
6:25vertices, a lot more triangles, so it
6:27does cause more lag. And it doesn't look
6:29that much better. And another way you
6:30can do it is by creating clumps of grass
6:34like this and then spreading this
6:35around. Now, this has a benefit of
6:37adhering to the terrain a little [music]
6:39more closely, but it can be a little bit
6:41too uniform. But, the main downside is
6:43that it creates a whole lot more objects
6:44than the other one. And Roblox Studio
6:46just lags simply by having more objects,
6:49even if it's the same triangle count.
6:51So, just be aware of that. Now, another
6:52thing you should do is select all of
6:55these top vertices and double-tap G to
6:58slide them down a little bit. Now, you
7:00do this to prevent image bleeding into
7:03the top. And you can also do this for
7:05the bottom, too, just a little bit. Make
7:07sure they all line up still. Anyways,
7:09anyways, anyways, once you have this
7:12Anyways, once you have this clump
7:13finished, anyways, once you have this
7:15object finished, you should select it,
7:17go into file, export FBX, and just save
7:20it as something you'll remember. Then,
7:22make sure you do limit to selected
7:24objects, export FBX. Then, you can go
7:26into Roblox Studio. Okay, once you get
7:28into Roblox Studio, you should go into
7:30the home tab and press import, find the
7:32model you just saved, then just simply
7:34import it. Now, if it imports and it's
7:37way too large, you can simply just scale
7:40it down and make sure you name it
7:42something you remember. Go into the mesh
7:44and select double-sided. This way you
7:46can actually see it. Then go into the
7:47render fidelity, set this to
7:49performance, set the can collide to
7:51false, set the can query to false, set
7:53the can touch to false, set the audio
7:55can collide to false, set the collision
7:57fidelity to box. This just helps with
7:59performance. Then what you want to do is
8:02just make sure it's the right size. Then
8:04go into the mesh plane, add in a surface
8:07appearance, click on the color map, and
8:09add in one of the textures you saved.
8:11Once you do this, set the alpha mode to
8:13transparency, and then it should be
8:15basically finished. Now, another thing
8:17you can do is adding in a normal map.
8:20Now, in order to do this, go back into
8:21Google and search up normal map
8:23generator. I recommend using this GitHub
8:26one. We'll select one of the textures
8:27you created, and I recommend setting the
8:29strength to 0.5 and the blur sharp to
8:32-1. Then just download that normal
8:35texture and add it in here. And this
8:37will simply just add in just a little
8:39bit more depth to it. So, yeah, now you
8:41can just duplicate this model, go into
8:44the surface appearance, and change the
8:46color map to each new texture you
8:48created, and just repeat the process.
8:51Once you're done, you should have four
8:52different objects for the four textures
8:54you saved. And now it's time for
8:56actually scattering these objects. And
8:58the way I recommend doing this is
8:59through this plugin called brush tool.
9:02Now, I'll link this in the description.
9:03Now, before you add these brushes to the
9:05brush tool, what I recommend doing is
9:07duplicating them and going into the
9:09surface appearance and decreasing the
9:11color just a little bit so it becomes
9:13slightly darker and just adds a little
9:15bit more variation to the models. Make
9:17sure you name these all differently so
9:19you don't get confused. Then simply add
9:21them all to the brush. Then the radius
9:25increases and decreases the size of
9:28which it'll be scattered. So, if you set
9:30this really small, it'll be a very fine
9:32brush. Set it really large, it can go
9:33across massive areas. The spacing
9:36determines how many objects will be
9:38scattered in the radius. So, if you set
9:40this really low, there will be a lot. If
9:41you set this really high, there will be
9:43barely any. So, what I recommend doing
9:46is setting the spacing to two to three
9:48and the radius to 16. If it's larger
9:51than 16, it usually doesn't fill in as
9:52well and there'll be little gaps in the
9:54area. Now, you simply just scatter it
9:56all around. Now, depending on how good
9:59your PC is, this could cause a whole lot
10:01of lag. So, just be cautious of that
10:03because you are, in fact, placing
10:05hundreds of assets. But, it is a quick
10:07way to create really nice-looking grass.
10:09Now, one thing I recommend is not evenly
10:12distributing every type of grass at once
10:14like this because this isn't realistic.
10:16But, what I do recommend you do is
10:18creating different groups that you'll
10:19scatter separately. Now, what I mean by
10:21that is enabling three different grass
10:24particles and just going around adding
10:27little random strokes like this. And
10:28you'll slowly fill in with the different
10:31types of grass. You fill in all of these
10:33empty gaps. Then, once you're done doing
10:35the first part, disable it and select
10:38the next grass you want to scatter
10:40randomly. You just want to fill in all
10:41of these little gaps. And then, finally,
10:43go in with your last little selection
10:46and fill in every little last gap. And
10:48by doing this, you just create natural
10:50little spots where different vegetation
10:52grows, which does reflect real life more
10:55closely. And that's the basics of
10:56creating nice grass in Roblox.
11:05So, to start off, one of the quickest
11:08way to improve performance is by
11:10disabling the cash shadow property. Now,
11:13you can hardly notice whether it's on or
11:16off. Makes a very minimal difference and
11:18it creates a much more performant
11:21experience if you disable all of the
11:22cash shadows with all of these thousands
11:25of grass parts. So, that's the first
11:27thing I recommend doing. The next thing
11:28I recommend doing is when you're
11:30creating your terrain, make sure it's
11:32very hilly. Now, the reason for this is
11:34because Roblox has a built-in occlusion
11:36culling feature. And that means, if I
11:38just go into wireframe, all the objects
11:41hidden behind something are
11:43automatically removed from the scene.
11:45So, if you naturally have a very hilly
11:48scene, then objects will be hidden
11:49automatically. But if you have a very
11:51flat scene, you'll be able to see all of
11:53the parts, which will be very laggy. But
11:54if you have a very hilly scene,
11:56everything behind will be deleted.
11:58That's just a quick way to optimize and
12:00have a just a more interesting-looking
12:02scene. Now, the next thing you can do is
12:04adding in different objects into the
12:06scene that will also take advantage of
12:09this occlusion culling feature. So, like
12:11with the hills, if you have a simple
12:12object in front of something, it will
12:14delete everything that's behind it. Now,
12:16good examples of this are trees and
12:19buildings. So, if you have a very thick
12:21forest, a lot of those trees will cover
12:23up a decent amount of grass. And of
12:26course, with buildings, they take up a
12:27whole lot of space, so everything behind
12:29them will be culled out. So, while it
12:31might be nice to have an open field, it
12:33would be better to spread random objects
12:35throughout it just to increase
12:36performance a little bit. Now, another
12:38way to increase performance is using the
12:40streaming function built into Roblox.
12:43Now, what this means is that around the
12:45character, it will stream in items in a
12:47set radius. So, the larger this number,
12:50the further things will render. And the
12:52smaller this number, the closer it will
12:53be to the character. So, if you, for
12:55instance, set this to like 300 and then
12:58test it real quick. So, as you can see
13:00here, only objects that are 300 studs
13:01away from me are loaded in. And when I
13:03walk around, you'll see things start to
13:06be streamed in. It's a little bit
13:07glitchy right now, but that's another
13:09way to increase performance. But I
13:10personally wouldn't tweak this that
13:12much. I would just leave it at what it
13:14was before. Now, ultimately, having this
13:16many objects will cause lag. And it's
13:19really up to you to determine how many
13:22parts and objects you want in your
13:24scene. You You always decrease the
13:26density while brushing the grass around,
13:29and that will help with the lag quite a
13:30lot, but it is just a give and take. You
13:33have to decide how large you want the
13:34scene to be, and if you want grass over
13:36every single part. Now, this entire
13:38scene is only a million triangles, which
13:42in, you know, the grand scheme of things
13:44isn't that much. It's only 30 draw calls
13:46as well. So, just be aware of that.
13:48Yeah.

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