Low FPS after placement of low tris tres

Development World Creation
1

Hello forum!

I’ve been working with Blender for quite a while on-off, and Unreal Engine 4 for the last two weeks.
I think I’m starting to get the hang of UE4, but there’s still one problem that bothers me.

I’ve learned that low tris grass (6-8-16 tris) and low tris trees (60-80) are great for performance.
The grass doesn’t seem to hit my FPS that much (haven’t tested with huge grass areas with a density of 8000), but the trees seems to be a great impact on my FPS.

To be clear, we’re talking about 72 tris trees made with blender (refer to image below)

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I’ve placed 10 trees into my scene (refer to image below)

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As you can spot in the top right corner of the image above, I only seem to achieve an FPS of 23-30 (even lower when running the game).

I’m not quite sure why this is happening.
If any of you need my specs, here they are:

  • Processor: Intel Core I7-3630QM 2.40GHz
  • 16GB DDR3 RAM
  • Nvidia GeForce GTX 670MX (Laptop)
  • Windows 10 64-bit

If you need more specs, tell me and I’ll edit the list.

Can anyone tell me why this has such a huge impact on my FPS?

2

-could you show a wireframe view of your mesh? -> make sure to keep the transparent areas as low as possible :slight_smile:
-especially in laptops it could be that you use the wrong gpu (e.g in my laptop I have an integrated gpu and a gaming gpu) -> make sure that you use the good one
-show a pic of the material

3

Wireframe from Blender:

3bb84ee7e2313f2690f32593b3523b6556612eb2.jpeg
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Material (Not the movement of the texture (Simple Grass Wind))

efa2a4c63903ea253a845544ae0d3ecb6d361afa.jpeg
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I’m pretty sure I’m using the correct GPU as I set the global setting to use the Nvidia one (will check though -> Laptops FTW)

4

Okay, I was running on the integrated GPU -> Trying with my Nvidia

5

Yep, that will surely boost your fps count :slight_smile:

  • also make sure to run your pc on the “high performance” power settings

Beside that everything looks correct -> you could improve the tree planes a little bit (e.g at the top you have large transparent areas -> better add some more vertices) + do you use the foliage shading blend mode?

6

I’m not sure what you mean? Could you explain?

Other than that, could you please provide a picture of a wireframe and a solid picture a tree from your “Free Foliage Starter Kit”?
Bare in mind, first time making trees :slight_smile: and my first tree (made in Blender with the sapling addon) was 50k tris :slight_smile:

7

There is a special way to create a foliage material -> dont know if it will improve the performance, but it looks better :stuck_out_tongue:

70967198b83c66da90be85fab30626725bce69bb.jpeg
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The trees from the starter kit are not so good -> better take a look at some of the trees from speedtree -> you can download one for free

8

Just be clear, It’s not foliage. I’m dragging and dropping the meshes into the scene, since I think I read somewhere, that you can’t make foliage “sway” in the wind. Maybe that’s just me

9

foliage = trees, grass, flowers,… :wink:
So even when you drag and drop them into the scene you can still use a foliage material.
But even when you place them with the foliage tool you can let them swing -> take a look at my foliage pack