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How to make OPTIMIZED Realistic Trees for Roblox Games — Transcript

by Ice Guy · 3,070 words · 424 segments · language en · Watch on YouTube

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0:00This is how you can quickly make
0:01optimized realistic trees in Blender.
0:03Let's begin. Okay, to begin you can
0:05delete all these. Let's go up to
0:07preferences. Going to get extensions,
0:09search up tree, then install the sapling
0:11tree generator. Then make sure it's
0:13enabled in the add-ons. Then when you
0:15press shift A, go to curve, you should
0:17see sapling tree gen right there. Now,
0:19there's a lot of settings that you can
0:21change that will affect it drastically.
0:23But make sure you do not click off this
0:25menu like click onto this cuz then you
0:27can't bring it back up unless you press
0:29F9 and it'll bring it back up, but I
0:32would just recommend not clicking off of
0:34it. Now, to begin I would go into a
0:36preset one such as white birch. I would
0:38just start with this. Make sure in
0:40geometry you decrease these resolutions
0:43a bit because it can be pretty dense to
0:45start out. I typically have one bevel
0:48and two curve to begin. Then you can go
0:50into branch splitting. The base splits
0:52are how many split at the base. Then
0:54levels are how many times it splits
0:57moving out the tree. You should really
0:58only have it set to one or two. For now,
1:01you can always go back and tweak it.
1:02Now, for the branch growth, this one
1:04affects how long the trunk is. So, if we
1:06go back to branch splitting [music] set
1:08to zero, this is how long the trunk is
1:10and this one's how long the branches
1:11are. So, when you're creating a tree
1:13like this, I would recommend having more
1:15branches than you think you should. You
1:16can always go back and delete them.
1:18It'll help with setting up leaves, so
1:19you know, just trust me on that. Then
1:21you can go to vertical attraction. This
1:23increases or decreases how the gravity
1:26affects it. This as well as the downward
1:28angle affects how it goes. Like that, so
1:30you can tweak these to get a different
1:32effect and see how it looks. Then you
1:33can go to branch radius and just tweak
1:35the ratio. Usually it's pretty good as
1:38the default. Maybe just increase it
1:39slightly and increase the [music] root
1:41flare a little bit. Now, to decrease
1:43this triangle count even more, you can
1:44go to growth. You can go to branch
1:46splitting, decrease this curve
1:48resolution quite a bit. I would
1:49recommend setting it to eight there and
1:51about four there. Then you can decrease
1:53the amount of branches as well. Usually
1:55you don't want any less than 30 to
1:57begin. You can go ahead and tweak these
1:59settings and once you have something
2:00good that you like, you can go back to
2:01geometry, set a name right here. You can
2:03set it to tree. I'll just name it
2:06tutorial tree. Then you can do export
2:08preset and you can load in that tree
2:10anytime you want. Yeah, then you can
2:12play with the random seed and quickly
2:15create just lots of different variations
2:18of trees. So once you do have something
2:20good that you like, I would recommend
2:22something that looks similar to this.
2:24What you can do now is just do control
2:26A, visual geometry to mesh. This just
2:28turns it from a curve into an actual
2:30mesh. Then what you should do is get the
2:33circle select, increase the radius a bit
2:35and select all of the edge branches.
2:37Going into wireframe view will help a
2:40lot in this. So just go around, select
2:42all the branches. It doesn't need to be
2:43that precise and even. Just something
2:45like that will do. And then go into
2:48vertex groups and add a vertex group and
2:51click assign. You can name this. I'm
2:52just going to leave it as group. Next
2:54we're going to start on making the
2:56leaves. So for this, add in a plane.
2:58Sorry to interrupt, but did you know
3:00that not even 3% of people watching are
3:02subscribed? So if you find this video
3:04helpful, it would mean a lot if you
3:05could press that button. Okay, back to
3:07the video. Scale it however you want.
3:09Then to find the leaf, you can go into
3:11Google. You can just search up branch
3:14texture. Go into images and then just
3:16download any of these. I would recommend
3:18downloading four textures and have it be
3:20a leafless branch like this. Then go
3:22into a photo editing software. I'm going
3:24to be using Photopea. Select new
3:26project. Make sure it's set to 1024 by
3:291024. Click to create. Then you can drag
3:33in your images. Make sure they're 512
3:36respectively. Just put them into each
3:38corner. If they're too big, you can
3:40always scale them down. Okay, something
3:42like this works. Make sure they're
3:43transparent as well. Now depending on
3:46how optimized and how low triangle count
3:48you want your finished product to be,
3:49you You skip this step and just use
3:51these as your textures, but what I'm
3:53going to do is just decrease the size of
3:55these and multiply them multiple times.
3:58That way it looks like there's multiple
4:00branches strung across, so it looks more
4:02detailed. But it will result in lower
4:04quality [music] textures, so I'm just
4:06going to
4:19Okay, now I'm done. Now, the reason I
4:21did that is because since there's four
4:23textures on these, it requires four
4:25times less the parts required to show
4:28this much detail. A lot of the texture
4:30quality does get lost, so you know, it's
4:31a balance you have to maintain. Now,
4:33it's also important to make sure that
4:35these textures fit somewhat. Now, what
4:37do I mean by that? This texture is a
4:38little more saturated than that one, and
4:39this one's a little more cool than that
4:41one. So, what you could do is just
4:43decrease the contrast a little bit,
4:45change the color, change the saturation
4:46[music]
4:47a little bit, you know, just something
4:49like that. So, it fits a little closer.
4:51But you know, that's of course your
4:52preference. So, once you have all of
4:54this whole done ready, you can just
4:56export as PNG. Then you can go back into
4:59Blender. Now, select your plane, go into
5:02the shading tab, then select new,
5:06bring in an image texture, open up that
5:08file you just saved, plug the color into
5:10color, the alpha into alpha, bring up
5:12the roughness. There you go. Now, go
5:14into UV editing and just make sure that
5:17these fit onto [music] the plane.
5:20Something like this will work. Make sure
5:22there's no overlapping bits like that.
5:24Now, you can always do double tap G and
5:26just drag it up a little bit. Something
5:28like that works. Now, it's important to
5:30double tap G instead of just moving it,
5:32[music] cuz that will distort the
5:33texture. By double tapping G, you
5:35maintain the texture and you can move
5:38the vertices. [music] That's just a
5:39quick little tip. Now, what you can do
5:41is add in some loop cuts like that.
5:44Let's go back to layout mode, and then
5:46just give it some depth. Just play
5:48around with it a little bit. Doesn't
5:50need to be even or anything and shade
5:52smooth. That just gives it some depth.
5:54Make sure the origin is in the center of
5:57it like that. Okay. Now, duplicate this
6:00four times for each of the textures you
6:03have. Go back to UV editing then just
6:05place it over the texture like that. Get
6:07the seams a little bit closer. Something
6:09like that will work. And just do that
6:11for each texture. There you go.
6:13Something like that will work. And now
6:15we can just add a quick little temporary
6:17material here. Just change the base
6:19color to brown. Okay. Now, what we're
6:22going to do is we're going to add in a
6:23particle system. Go into your particles
6:26right here. Click on this. You can name
6:28this [music] to anything you want. I'll
6:29just name it to tree one or leaf one
6:31would work better. Set it to hair. Set
6:34this number to 10 for now. Make sure you
6:35click on advanced. Go to rotation. Set
6:38this to global Z. You can leave these be
6:40for now. Go into render. Render as
6:43object. Select your leaf. There you go.
6:45You can see it up there. Now, for scale
6:47randomness, I typically do 0.6. Just
6:50increase the scale a whole lot. Make
6:51sure you apply these rotation and
6:54scales. Also, make sure you save your
6:56file. I'll just name this to tree test.
6:58Now, if these aren't oriented properly,
7:01you can always rotate these as so. Just
7:03so it's facing downwards like this.
7:06Something like that works. Okay. Now,
7:08you can go increase randomize a little
7:10bit. Increase your inner phase a little
7:12bit. I wouldn't recommend changing the
7:14phase at all. Just leave it at zero.
7:16Next, we're going to go into the vertex
7:18groups. For density, just select the
7:20group. Now, you can crank up the number.
7:23You can increase the randomize and makes
7:25it more fluffy like that. You can leave
7:27it be. I like having it pointing down a
7:29little bit more. So, leave it like that.
7:31Then, what I typically do is just refine
7:34this vertex group a little bit. So, go
7:36into weight paint like this. Set the
7:38weight to 0.5. Then, go around all these
7:41branches like this. Doesn't need to be
7:44perfect or anything. You just want there
7:45to be more leaves at the end and less
7:47fading into the trunk. And then you can
7:49set the white paint to zero for the
7:52trunk. Go up like that. Do something
7:54like that. Then enable it again. I'd say
7:57that looks a little bit better.
7:58Honestly, what you could do is set this
8:01to 0.1 and just increase it like that.
8:04That way there's even less clumped up in
8:06the middle and I think that [music]
8:07looks better. Okay. Next, to get some
8:09variety in label this leaf one and
8:12duplicate it. Label this leaf two.
8:14Duplicate it. Label this leaf three.
8:15Duplicate it and label this leaf four.
8:18Now you should have four of these and
8:20add in four particle systems. Make sure
8:22these all line up. Third system for the
8:24third leaf. Fourth system for the fourth
8:26leaf. First system for the first leaf.
8:28Then what you can do is go into the
8:30systems and then just change the object.
8:34For the second system, I'll be selecting
8:36this. Boom. For the third system, I'll
8:38be selecting the third texture. For the
8:41fourth system, I'll be selecting the
8:42fourth texture like that. Then if it
8:44looks like this, go into density. Select
8:47your vertex group again. And there you
8:49go. Now, what I typically do is have one
8:52leaf show up a whole lot more than the
8:53others. So for that, I will use this
8:56one. Set the number to this to about 150
8:59to begin with. For this branch, you want
9:01this to be really low. Just set it to 50
9:05like that. And for this one, you can
9:07just set it to like 75 will work. This
9:10one, just set it to 75 again. And look
9:12at it with all of them. Now, I would
9:14increase the scale. Scale to 0.5 for all
9:17of them. Just play around with the
9:18particle settings until you get
9:20something that looks good.
9:23While this time lapse plays, I wanted to
9:25let you know that I will be selling
9:26these tree assets and much more on my
9:28Ko-fi shop. So if you don't want to go
9:29through the hassle of making these, you
9:31can always purchase them. It helps
9:32support the channel, too. Anyways, back
9:34to the video. Okay, I think this looks
9:36pretty good. Good enough. What I'm going
9:38to do is just shift duplicate this, move
9:40this off just in case I want to use it
9:42for something, hide that, and select the
9:45tree, select make instances real, then
9:48you can click on the stump itself, then
9:50visual geometry to mesh. Now, what you
9:52need to do is select all of these base
9:55textures, duplicate them, select all
9:57these leaves, unselect the trunk, just
9:59click on one, control J to combine them
10:01all, and delete all of these. Now, you
10:04have the leaves and you have the trunk.
10:06Now, I typically do is delete these
10:08branches that are poking out a little
10:10bit. So, to do that, just get the circle
10:13select, and then just select all of
10:15these that are poking out a little bit.
10:17You can select more at the top since
10:19most people won't see that, and less at
10:21the bottom because that will be more
10:22noticeable. Select all of them.
10:24Something like this will do. Then, just
10:26delete them all. If parts sticking
10:28[music] out like this, just move it into
10:30the leaves so it's less noticeable.
10:32Decrease the scale maybe, like that. You
10:34always go in and tweak it a little bit
10:36more, up to you, of course. Then, what
10:38you can do is further optimize this
10:40since 5K triangles is a little bit too
10:42much. Go into the stump, add on decimate
10:45modifier. I typically don't go any lower
10:47than 0.6. That decreases it quite a lot.
10:50Then, what you can do is go into the
10:51leaves, select everything, go into mesh,
10:54clean up degenerate dissolve. Increase
10:56this so it deletes all of those little
10:59faces. Once you see some big changes,
11:01you should stop. Do 0.25.
11:04some. Then, you can go into mesh, clean
11:06up, delete loose, then it removes all
11:08the vertices left over. Now, you
11:10typically want it to be below 3,000
11:12triangles. Right now, it's at 3,700. So,
11:15what you can do is select the leaves,
11:16add a decimate modifier, and just
11:18decrease it until the model's at 3,000.
11:22Of course, you can have it higher if you
11:24don't really care about that, but I
11:25don't think it makes a significant
11:27enough impact, and destroying 700
11:29triangles makes a significant impact on
11:32performance when you have massive
11:33forests. Okay, now once you have this
11:36all done, you can select it, click on
11:38export FBX, select the objects, then
11:41export FBX. Then you can go into Roblox
11:43Studio, go into any random place, select
11:46import, find your model, and then just
11:49import it. Once it imports, you can
11:51scale it down, go into your leaves, copy
11:54that texture ID, add in a surface
11:56appearance, paste that texture ID into
11:58color map, make sure the alpha mode set
12:00to transparency, then it loads in. Now
12:02another trick you can do is add in a
12:05normal map. Search up normal map
12:07generator, load in your original
12:10texture, increase the bias as much as
12:12you want, save it, import the normal map
12:16into the surface appearance. That just
12:18adds just a little bit more depth to it.
12:20See, it just adds a little bit more
12:21depth to it. Now for the trunk, what I
12:23would suggest doing is creating a
12:25material variant from a PBR texture. Now
12:28to do that, you can go back to Google,
12:30search up AmbientCG. You can use this or
12:33Poly Haven, those are the two websites I
12:35suggest. Search up bark, any of these
12:37will do, download a 1K, unzip the file,
12:41go back into Roblox Studio, click on
12:42material, material manager, add material
12:45variant. For color, find your color map.
12:48For normal, find your normal map. For
12:50roughness, find your roughness map.
12:52Apply it to the tree. Make sure this is
12:54set on organic. You can increase or
12:56decrease the tiling as you see fit. Now
12:59to optimize this for games, what I would
13:01suggest doing is click on the leaves,
13:04disable all of these collisions, make
13:06the collision fidelity set to box, and
13:09then for the stump, you can disable all
13:12of these if you don't need them, and
13:13keep the collision fidelity set to
13:15default. Now to create massive forests
13:17easily, I would recommend using the
13:18brush tool, add your brush, increase the
13:20spacing and the radius quite a bit, make
13:23the rotation random, make the scale
13:24random, I'm this to about 0.8 and 1.2.
13:27Make the orientation up and just spread
13:30it all around. If you see a weird little
13:32under glow to the leaves, what you can
13:34do is just go into toolbox, go into
13:37decals, search up white, select this
13:40copy asset ID, then go into your
13:42roughness map, paste that in, then
13:44you'll see it go away. Also, make sure
13:46the render fidelity is set to
13:48performance for both the trunk and the
13:50leaves because there's thousands of
13:52trees in a forest, you want to make sure
13:53that they're as optimized as possible so
13:55you can massive forests that look good.
13:59Now, to get roots, what you can do is
14:01just add in a plane, go into edit mode,
14:03merge at center so you can just get a
14:05vertice. Push these vertices out a
14:07little bit, feel like this, make it go
14:09down. Something like this will do. Then
14:12you can add in a skin modifier and then
14:15if you really wanted to, you could add
14:17in a subdivision surface. You can press
14:20control A on a vertice and it will
14:23increase the thickness. Then just
14:24something like this will do. You can
14:26obviously make this look better. Supply
14:28these, shade smooth, decimate it. Okay,
14:30this kind of looks terrible but if you
14:32spent more time at it, it can look
14:33better. Anyways, now the good thing
14:35about this method is that you can easily
14:37make a lot of variants from it. So,
14:40really all you need to do is add in
14:42another sapling tree, select your
14:44preset, change the seed, copy the
14:47material, make sure you apply this, then
14:49do your particle things. All the
14:51particles that have been saved from the
14:53previous version, only thing you have to
14:55redo is selecting the vertices, which is
14:59really not that difficult. Do it in
15:01about 30 seconds. Honestly, closer to 10
15:04seconds. Just something like that will
15:05work. Go to vertices, vertex groups, add
15:08group, assign, then go into select the
15:10density for each group, then just
15:12reselect all of these objects. There you
15:14go, you have another tree in less than a
15:16minute. Now, I hope this tutorial helped
15:18you. Goodbye now.

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